197 results on '"J. Gagnon"'
Search Results
2. Perceptions and Understanding of Patients with Cardiovascular Disease and Non-Licensed Caregivers about Patient-Centered Care: An Exploratory Study in Central Appalachia
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Hadii M. Mamudu, Kristy J. Gagnon, Mary Ann Littleton, Amy M. Poole, Cynthia J. Blair, Ginny Kidwell, Lynn Frierson, Rob Gregory, Carl Voigt, and Timir K. Paul
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Caregivers ,Cardiovascular Diseases ,Communication ,Health Personnel ,Patient-Centered Care ,Public Health, Environmental and Occupational Health ,Humans - Abstract
This study explored knowledge, understanding, and perceptions of patient-centered care (PCC) among patients with cardiovascular diseases and their non-licensed caregivers (NLCs) in Central Appalachia, a medically underserved rural environment. Seven focus group discussions (FGDs) involving 78 patients/NLCS were conducted across the six states of the region. Focus group discussions were audio-recorded, transcribed, and thematically coded. Major themes were: 1) access to quality health care providers (HCPs) and 2) patientprovider interactions. Subthemes for access to quality HCPs included a) long-term relationships with providers, b) high turnover of cardiovascular specialists, c) lack of traditional family physicians, and d) physician assistants/nurse practitioners versus physicians as primary providers. Subthemes for patient-provider interactions included a) reciprocal communication, b) individualized care, and c) meaningful voice in care decisions. These results underscore the importance of interpersonal relationships with providers in the delivery of medical care in the region.
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- 2022
3. Clinical practice guideline recommendations for pediatric injury care: protocol for a systematic review
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Lynne Moore, Gabrielle Freire, Anis Ben Abdeljelil, Melanie Berube, Pier-Alexandre Tardif, Eunice Gnanvi, Henry Thomas Stelfox, Marianne Beaudin, Sasha Carsen, Antonia Stang, Suzanne Beno, Matthew Weiss, Melanie Labrosse, Roger Zemek, Isabelle J Gagnon, Emilie Beaulieu, Simon Berthelot, Terry Klassen, Alexis F Turgeon, François Lauzier, Ian Pike, Alison Macpherson, Belinda J Gabbe, and Natalie Yanchar
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Canada ,Databases, Factual ,Australia ,Humans ,General Medicine ,Child ,Delivery of Health Care ,Systematic Reviews as Topic - Abstract
IntroductionEvidence suggests the presence of deficiencies in the quality of care provided to up to half of all paediatric trauma patients in Canada, the USA and Australia. Lack of adherence to evidence-based recommendations may be driven by lack of knowledge of clinical practice guidelines (CPGs), heterogeneity in recommendations or concerns about their quality. We aim to systematically review CPG recommendations for paediatric injury care and appraise their quality.Methods and analysisWe will identify CPG recommendations through a comprehensive search strategy including Medical Literature Analysis and Retrieval System Online, Excerpta Medica dataBASE, Cochrane library, Web of Science, ClinicalTrials and websites of organisations publishing recommendations on paediatric injury care. We will consider CPGs including at least one recommendation targeting paediatric injury populations on any diagnostic or therapeutic intervention from the acute phase of care with any comparator developed in high-income countries in the last 15 years (January 2007 to a maximum of 6 months prior to submission). Pairs of reviewers will independently screen titles, abstracts and full text of eligible articles, extract data and evaluate the quality of CPGs and their recommendations using Appraisal of Guidelines Research and Evaluation (AGREE) II and AGREE Recommendations Excellence instruments, respectively. We will synthesise evidence on recommendations using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) Evidence-to-Decision framework and present results within a recommendations matrix.Ethics and disseminationEthics approval is not a requirement as this study is based on available published data. The results of this systematic review will be published in a peer-reviewed journal, presented at international scientific meetings and distributed to healthcare providers.PROSPERO registration numberInternational Prospective Register of Systematic Reviews (CRD42021226934).
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- 2022
4. Ceftriaxone to PRevent pneumOnia and inflammaTion aftEr Cardiac arresT (PROTECT): study protocol for a randomized, placebo-controlled trial
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David J, Gagnon, Sergey V, Ryzhov, Meghan A, May, Richard R, Riker, Bram, Geller, Teresa L, May, Sarah, Bockian, Joanne T, deKay, Ashley, Eldridge, Thomas, Van der Kloot, Patricia, Lerwick, Christine, Lord, F Lee, Lucas, Patrick, Mailloux, Barbara, McCrum, Meghan, Searight, Joel, Wirth, Jonathan, Zuckerman, Douglas, Sawyer, and David B, Seder
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Inflammation ,Treatment Outcome ,Double-Blind Method ,Ceftriaxone ,Humans ,Medicine (miscellaneous) ,Pharmacology (medical) ,Pneumonia ,Out-of-Hospital Cardiac Arrest ,Randomized Controlled Trials as Topic - Abstract
Background Pneumonia is the most common infection after out-of-hospital cardiac arrest (OHCA) occurring in up to 65% of patients who remain comatose after return of spontaneous circulation. Preventing infection after OHCA may (1) reduce exposure to broad-spectrum antibiotics, (2) prevent hemodynamic derangements due to local and systemic inflammation, and (3) prevent infection-associated morbidity and mortality. Methods The ceftriaxone to PRevent pneumOnia and inflammaTion aftEr Cardiac arrest (PROTECT) trial is a randomized, placebo-controlled, single-center, quadruple-blind (patient, treatment team, research team, outcome assessors), non-commercial, superiority trial to be conducted at Maine Medical Center in Portland, Maine, USA. Ceftriaxone 2 g intravenously every 12 h for 3 days will be compared with matching placebo. The primary efficacy outcome is incidence of early-onset pneumonia occurring lostridioides difficile-associated diarrhea. The trial will enroll 120 subjects over approximately 3 to 4 years. Discussion The PROTECT trial is novel in its (1) inclusion of OHCA survivors regardless of initial heart rhythm, (2) use of a low-risk antibiotic available in the USA that has not previously been tested after OHCA, (3) inclusion of anti-inflammatory effects of ceftriaxone as a novel mechanism for improved clinical outcomes, and (4) complete metagenomic assessment of bacterial resistomes pre- and post-ceftriaxone prophylaxis. The long-term goal is to develop a definitive phase III trial powered for mortality or functional outcome. Trial registration ClinicalTrials.gov NCT04999592. Registered on August 10, 2021.
- Published
- 2022
5. Perceptions Regarding the SARS-CoV-2 Pandemic's Impact on Neurocritical Care Delivery: Results From a Global Survey
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Abhijit, V Lele, Sarah, Wahlster, Bhunyawee, Alunpipachathai, Meron Awraris Gebrewold, Sherry H-Y Chou, Gretchen, Crabtree, Shane, English, Caroline, Der-Nigoghossian, David, J Gagnon, May, Kim-Tenser, Navaz, Karanjia, Matthew, A Kirkman, Massimo, Lamperti, Sarah, L Livesay, Jorge, Mejia-Mantilla, Kara, Melmed, Hemanshu, Prabhakar, Leandro, Tumino, Chethan, P Venkatasubba Rao, Andrew, A Udy, Walter, Videtta, Asma, M Moheet, Alampi, Daniela, and in NCC-COVID Study Collaborators, et al.
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Critical Care ,SARS-CoV-2 ,pandemic ,lnfectious Diseases and Global Health Radboud Institute for Molecular Life Sciences [Radboudumc 4] ,COVID-19 ,Intensive Care Units ,covid-19 ,care delivery ,neurocritical care ,resources ,sars-cov-2 ,Anesthesiology and Pain Medicine ,Surveys and Questionnaires ,Humans ,Surgery ,Neurology (clinical) ,Delivery of Health Care ,Pandemics - Abstract
Contains fulltext : 248999.pdf (Publisher’s version ) (Closed access) BACKGROUND: The SARS-CoV-2 (COVID-19) pandemic has impacted many facets of critical care delivery. METHODS: An electronic survey was distributed to explore the pandemic's perceived impact on neurocritical care delivery between June 2020 and March 2021. Variables were stratified by World Bank country income level, presence of a dedicated neurocritical care unit (NCCU) and experiencing a COVID-19 patient surge. RESULTS: Respondents from 253 hospitals (78.3% response rate) from 47 countries (45.5% low/middle income countries; 54.5% with a dedicated NCCU; 78.6% experienced a first surge) participated in the study. Independent of country income level, NCCU and surge status, participants reported reductions in NCCU admissions (67%), critical care drug shortages (69%), reduction in ancillary services (43%) and routine diagnostic testing (61%), and temporary cancellation of didactic teaching (44%) and clinical/basic science research (70%). Respondents from low/middle income countries were more likely to report lack of surge preparedness (odds ratio [OR], 3.2; 95% confidence interval [CI], 1.8-5.8) and struggling to return to prepandemic standards of care (OR, 12.2; 95% CI, 4.4-34) compared with respondents from high-income countries. Respondents experiencing a surge were more likely to report conversion of NCCUs and general-mixed intensive care units (ICUs) to a COVID-ICU (OR 3.7; 95% CI, 1.9-7.3), conversion of non-ICU beds to ICU beds (OR, 3.4; 95% CI, 1.8-6.5), and deviations in critical care and pharmaceutical practices (OR, 4.2; 95% CI 2.1-8.2). Respondents from hospitals with a dedicated NCCU were less likely to report conversion to a COVID-ICU (OR, 0.5; 95% CI, 0.3-0.9) or conversion of non-ICU to ICU beds (OR, 0.5; 95% CI, 0.3-0.9). CONCLUSION: This study reports the perceived impact of the COVID-19 pandemic on global neurocritical care delivery, and highlights shortcomings of health care infrastructures and the importance of pandemic preparedness.
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- 2022
6. Letter to the Editor: 'Midodrine to liberate ICU patients from intravenous vasopressors: Another negative fixed-dose trial'
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Richard R. Riker and David J. Gagnon
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Clinical Trials as Topic ,Intensive Care Units ,Midodrine ,Humans ,Vasoconstrictor Agents ,Administration, Intravenous ,Critical Care and Intensive Care Medicine - Published
- 2021
7. Refugee mothers, migration pathways and HIV: a population-based cohort study
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Joel G. Ray, Rahim Moineddin, Douglas M Campbell, Susitha Wanigaratne, Jennifer Blake, Mark H. Yudin, Meb Rashid, Yogendra Shakya, Anita J. Gagnon, Donald C. Cole, and Marcelo L. Urquia
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Adult ,Health (social science) ,Adolescent ,Social Psychology ,Refugee ,Population ,Human immunodeficiency virus (HIV) ,Emigrants and Immigrants ,Mothers ,HIV Infections ,medicine.disease_cause ,Cohort Studies ,03 medical and health sciences ,Population based cohort ,0302 clinical medicine ,Prevalence ,Humans ,Medicine ,030212 general & internal medicine ,Social determinants of health ,education ,Ontario ,Refugees ,education.field_of_study ,030505 public health ,business.industry ,Public Health, Environmental and Occupational Health ,Middle Aged ,Increased risk ,Female ,Extended time ,0305 other medical science ,business ,Cohort study ,Demography - Abstract
Forced migration and extended time spent migrating may lead to prolonged marginalization and increased risk of HIV. We conducted a population-based cohort study to examine whether secondary migration status, where secondary migrants resided in a transition country prior to arrival in Ontario, Canada and primary migrants arrived directly from their country of birth, modified the relationship between refugee status and HIV. Unadjusted and adjusted prevalence ratios (APR) and 95% confidence intervals (CI) were estimated using log-binomial regression. In sensitivity analysis, refugees with secondary migration were matched to the other three groups on country of birth, age and year of arrival (+/- 5 years) and analyzed using conditional logistic regression. Unmatched and matched models were adjusted for age and education. HIV prevalence among secondary and primary refugees and non-refugees was 1.47% (24/1629), 0.82% (112/13,640), 0.06% (7/11,571) and 0.04% (49/114,935), respectively. Secondary migration was a significant effect modifier (
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- 2019
8. Evaluation of parent and youth experiences in advisory groups as part of a mental healthcare clinical trial: protocol for a mixed-method study
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Jananee Rasiah, Stephen Freedman, Lee Macdonald, Kassi Prisnie, Mohamed Eltorki, Yaron Finkelstein, Gareth Hopkin, Maria-Jose Santana, Jennifer Thull-Freedman, Antonia Stang, Matthew Prebeg, Isabelle J Gagnon, Margaret Steele, Ahmed Mater, Laurence Katz, Brian Greenfield, Laurie Plotnick, Suneeta Monga, Ellen Louise Lipman, Bruce Wright, Gina Dimitropoulos, Robert Porter, Katrina Hurley, Yazid N Al Hamarneh, and Amanda Newton
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Mental Health Services ,Parents ,Young Adult ,Adolescent ,Caregivers ,Research Design ,Humans ,General Medicine ,Patient Participation - Abstract
IntroductionPatient engagement in healthcare research is a necessity to ensure that research objectives align with priorities, outcomes and needs of the population under study, and to facilitate ease of implementation and adoption of findings. In clinical trials, there is an increasing focus on patient engagement during the planning and conduct of clinical trials due to the potential for ethical and methodological benefits. As patient engagement in clinical trials increases, there is a need to evaluate the approaches of these activities to contribute evidence on what is most appropriate and successful. The purpose of this study is to evaluate patient engagement processes and the activities of patient partners during and after a paediatric mental healthcare trial.Methods and analysisUsing a mixed-methods study design, we will evaluate patient partners’ engagement activities across set time-points during the trial and after trial completion. In this study, the term ‘patient partner’ is inclusive of two groups of people with lived experience: (1) caregivers (parents, formal/informal caregivers and family), and (2) youth (aged 15–24 years). Engagement will be evaluated using the participant and project questionnaires of the Public and Patient Engagement Evaluation Tool (PPEET), followed sequentially by semi-structured interviews. Quantitative data from the PPEET questionnaire will be analysed and reported using descriptive statistics. Data from open-ended questions from the PPEET questionnaires and semi-structured interviews will be analysed using thematic analysis.Ethics and disseminationApproval from Athabasca University Research Ethics Board will be obtained for this project. Findings will be disseminated at both academic and public venues whether in-person or online, and using platforms that are caregiver and youth friendly.Trial registration numberNCT04902391.
- Published
- 2022
9. [Roles and impacts of the pharmacist in the management of insomnia: A literature review]
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S-J, Gagnon-Lépine, S M, Benmesmoudi, and J-F, Bussières
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Pharmacies ,Canada ,Professional Role ,Sleep Initiation and Maintenance Disorders ,Humans ,Pharmacists - Abstract
Insomnia is a common sleep disorder that affects a large portion of the population in a situational, recurrent, or chronic way. In Canada, it is estimated that 13% of the population suffers from it.The primary objective of this literature review is to identify and describe studies dealing with the role and impact of the management of insomnia by a pharmacist.PubMed®, EMBASE® and CINALH Complete were searched to extract articles published between January 1st, 1990 and May 28, 2020. Studies on the role and impact of management of insomnia by a pharmacist, in French and English, descriptive or quantitative, with or without control group were included. Articles that did not deal with insomnia as the primary topic or where insomnia is a secondary condition were excluded, conference abstracts and studies showing no concrete results. The following variables were extracted: author, type of study, duration, location, sample size and characteristics of participants, description of pharmacist interventions, limits and biases, outcomes assessed and results. The quality of the pharmacists' interventions description was evaluated with DEPICT2.Our review identified eight articles published from 2006 to 2018 evaluating 14 types of outcomes and 41 separate outcomes. A total of 37% (7/19) of the quantitative outcomes had statistically significant positive results, regarding insomnia qualification, symptoms and adequate use. Six studies were conducted in community pharmacy. The quality score varied between 8 and 10 out of 11.There is little data on the role and impact of the management of insomnia by a pharmacist. The pharmacist can have a positive impact, particularly when practicing in a community pharmacy. Given the limited data and the prevalence of insomnia, it appears relevant to invest in pharmaceutical evaluative research for this condition.
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- 2020
10. [Evaluation of the ethics of pharmaceutical practice: A literature review]
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C, Lambert de Cursay, N, Akliouat, C, Karamé, S-J, Gagnon-Lépine, C, Porteils, A-L, Brière, and J-F, Bussières
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Pharmaceutical Preparations ,Students, Pharmacy ,Humans ,Pharmacy ,Ethics, Pharmacy ,Pharmacists - Abstract
Ethics are at the heart of pharmacy practice.This is a literature review. The main objective is to carry out a review of studies relating on the evaluation of ethics in pharmacy practice. Documentary research on Pubmed was carried out from 1990 to 2020. All studies relating to pharmaceutical ethics that may be applied to the pharmacy practice in pharmacies or in health establishments and that conducted a qualitative or quantitative evaluation of pharmaceutical ethics (e.g. surveying pharmacists or pharmacy students, using a measurement tool, quantifying or qualifying a perception or behaviour) were included.The studies come mainly from Anglo-Saxon countries (29/38). Studies related to pharmacy practice, mainly target pharmacists (n=27) and pharmacy students (n=16), and more often have a quantitative component of (n=28). The main ethical dilemmas observed dealt with emergency oral contraception (EOC), voluntary termination of pregnancy with drugs, euthanasia, commercial practices of the pharmaceutical industry, refusal to dispense a prescription in a broader context and plagiarism or dishonesty in academic settings.Few studies have been conducted on the review of ethics of pharmacy practices from 1990 to 2020. Pharmacy students and practicing pharmacists are regularly exposed to ethical dilemmas and respond to these dilemmas with due consideration, taking into account six principles, eight values and other factors. Exposure to these dilemmas creates inaction, stress and distress. A few possible solutions have been identified.
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- 2020
11. Security amidst stigma: Exploring HIV and sexual minority stressors through an attachment-based psychotherapy group
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Belinda Carrasco, Aaron S. Breslow, Christina Mastropaolo, and Gregory J. Gagnon
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050103 clinical psychology ,Psychotherapist ,Social stigma ,medicine.medical_treatment ,education ,Social Stigma ,Psychological intervention ,050109 social psychology ,HIV Infections ,Group psychotherapy ,Sexual and Gender Minorities ,Acquired immunodeficiency syndrome (AIDS) ,Transgender ,medicine ,Attachment theory ,Humans ,0501 psychology and cognitive sciences ,05 social sciences ,medicine.disease ,Minority stress ,Object Attachment ,Sexual minority ,Psychiatry and Mental health ,Clinical Psychology ,Psychotherapy, Group ,Psychology ,Stress, Psychological - Abstract
Despite strides in HIV prevention and lesbian, gay, bisexual, and transgender care, comprehensive care centers are of critical importance for lesbian, gay, bisexual, and transgender communities and people with HIV/AIDS who continue to contend with intersecting stigmas and chronic minority stressors. Building on the integrated attachment and sexual minority stress model, we discuss these themes by highlighting a group vignette from an urban psychiatric clinic that has provided affirmative psychotherapy to marginalized communities affected by HIV/AIDS for over 2 decades. The authors have rotated at the clinic as cofacilitators of a weekly, process-oriented group for sexual minority men who are HIV positive or are affected by HIV. In this article, we provide a theoretical foundation for HIV-affirming group psychotherapy and clinical integration of minority stress and attachment-based interventions. Group psychotherapy provides a rare opportunity to bond an often-isolated community by evoking factors of universality, cohesiveness, and catharsis. It simultaneously enables us to confront individual existential concerns with serostatus disclosure, grief, and feelings of victimization, as well as challenge internalized stigma and rejection sensitivity. We apply these issues to a verbatim clinical exchange, analyzing attachment-related themes and issues pertaining to minority stress and stigma, as well as discuss group mechanisms for attachment interventions. (PsycINFO Database Record (c) 2020 APA, all rights reserved).
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- 2019
12. International migration as a determinant of emergency caesarean
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Theresa W. Gyorkos, Sonia Semenic, William D. Fraser, Lisa Merry, Rhonda Small, and Anita J. Gagnon
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Social condition ,Culture ,Ethnic group ,03 medical and health sciences ,0302 clinical medicine ,Nursing ,Pregnancy ,Risk Factors ,Environmental health ,Maternity and Midwifery ,Humans ,Medicine ,Vulnerable population ,Emergency caesarean ,030212 general & internal medicine ,Social determinants of health ,reproductive and urinary physiology ,A determinant ,Labor, Obstetric ,030219 obstetrics & reproductive medicine ,Cesarean Section ,business.industry ,Parturition ,Obstetrics and Gynecology ,Prenatal Care ,Emigration and Immigration ,Delivery, Obstetric ,medicine.disease ,female genital diseases and pregnancy complications ,Distress ,Socioeconomic Factors ,Female ,business - Abstract
Background High caesarean rates are of concern given associated risks. International migrant women (women born abroad) represent a substantial proportion of women giving birth in high-income countries (HICs) and face social conditions that may exacerbate childbearing health risks. Among migrant women, emergency rather than planned caesareans, tend to be more prevalent. This method of delivery can be stressful, physically harmful and result in an overall negative birth experience. Research establishing evidence of risk factors for emergency caesareans in migrants is insufficient. Aims (1) Describe potential pathways (with a focus on modifiable factors) by which migration, using internationally recommended migration indicators: country of birth, length of time in country, fluency in receiving-country language, migration classification and ethnicity, may lead to emergency caesarean; and (2) propose a framework to guide future research for understanding “potentially preventable” emergency caesareans in migrant women living in HICs. Discussion “Potentially preventable” emergency caesareans in migrant women are likely due to several modifiable, interrelated factors pre-pregnancy, during pregnancy and during labour. Migration itself is a determinant and also shapes other determinants. Complications and ineffective labour progress and/or foetal distress and ultimately the decision to perform an emergency caesarean may be the result of poor health (i.e., physiological effects), lack of support and disempowerment (i.e., psychological effects) and sub-optimal care. Conclusion Understanding the direct and indirect effects of migration on emergency caesarean is crucial so that targeted strategies can be developed and implemented for reducing unnecessary caesareans in this vulnerable population.
- Published
- 2016
13. Tough decisions in medical specialty camps: Relationships between camp dosage, outcomes, and camper attendance
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Barry A. Garst, Ryan J. Gagnon, and Jasmine Townsend
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Male ,medicine.medical_specialty ,Coping (psychology) ,Health (social science) ,Adolescent ,media_common.quotation_subject ,Decision Making ,Specialty ,Structural equation modeling ,03 medical and health sciences ,0302 clinical medicine ,History and Philosophy of Science ,Respite care ,Adaptation, Psychological ,medicine ,Humans ,030212 general & internal medicine ,Child ,Competence (human resources) ,media_common ,030503 health policy & services ,Attendance ,United States ,Diabetes Mellitus, Type 1 ,Family medicine ,Camping ,Medicine ,Female ,0305 other medical science ,Psychology ,Positive Youth Development ,Autonomy ,Program Evaluation - Abstract
Rationale Medical specialty camps play a significant role in the lives of the youth they serve. These camps have been found to improve self-determination in campers, to develop camper skills in managing a disability or coping with a diagnosis, and to provide campers with respite/escape from the challenges associated with their disability or diagnosis. Youth attending medical specialty camps are often funded through full or partial scholarships, mitigating a significant constraint to their participation. These resources are limited, leading camp administrators charged with allocating funding to make challenging decisions in determining which campers would most benefit from camp participation. Objective This study examines a factor often linked to the escalating achievement of outcomes, repeated camp attendance, in 217 youth (ages 10–16) attending a one-week residential summer “Type 1 diabetes” camp. Specifically, two research questions were examined using a structural equation model (SEM): (1) what effect does repeat camp attendance (returning for multiple years) have on targeted outcome achievement, and (2) how does camper age moderate the relationship between repeated camp attendance and outcomes? Results The study results indicate across the 10-outcomes tested in the study (e.g., relatedness, autonomy, competence), repeat attendance had no statistically meaningful effect (p ≤ .05) on outcome scores, nor did camper age moderate the strength of relationship between attendance and outcomes. Conclusion The lack of relationship between attendance and outcomes supports prior meta-analyses suggesting the lack of value of repeated attendance, as does the non-significant moderational effect. The results of this study may illustrate to program providers and funders that no discernible benefit (in terms of targeted and measured outcomes in the current study) is due to repeat attendance, which can inform resource allocation and camper recruitment decisions.
- Published
- 2018
14. Participation of childbearing international migrant women in research
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Amy Low, Franco A. Carnevale, Anita J. Gagnon, and Lisa Merry
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Canada ,Internationality ,Research Subjects ,Torture ,Refugee ,Population ,Ethics, Research ,03 medical and health sciences ,0302 clinical medicine ,Pregnancy ,Humans ,030212 general & internal medicine ,Sociology ,education ,Transients and Migrants ,education.field_of_study ,030505 public health ,business.industry ,Public relations ,Research process ,Issues, ethics and legal aspects ,Diverse population ,Balance (accounting) ,Knowledge base ,Female ,0305 other medical science ,business ,Social psychology - Abstract
Fear of burdening or harming childbearing, migrant women, particularly refugees or others who have experienced war, torture, abuse, or rape, can result in their exclusion from research. This exclusion prohibits health issues and related solutions to be identified for this population. For this reason, while it may be challenging to include these women in studies, it is ethically problematic not to do so. Using ethical guidelines for research involving humans as a framework, and drawing on our research experiences. This discussion article proposes a number of strategies to improve the conditions for childbearing migrant women to participate in health research. What emerged as key for studying this diverse population and ensuring an ethically responsible approach are the use of methods that are adapted to the circumstances of childbearing migrant women and the involvement and support from “migrant-friendly” organizations. Ensuring migrant women are involved in the research process and knowledge produced is also critical. The more researchers working in this field communicate their experiences, the more will be learnt about how best to approach research with migrants. More migration and health research will enable a greater contribution to the knowledge base upon which the needs of this population can be met and their strengths maximized.
- Published
- 2014
15. Challenges newly-arrived migrant women in Montreal face when needing maternity care: Health care professionals’ perspectives
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Sandra Peláez, Lisa Merry, Kristin Hendricks, and Anita J. Gagnon
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Adult ,Male ,medicine.medical_specialty ,Canada ,Attitude of Health Personnel ,Health Personnel ,Case study ,Healthcare providers ,Nurses ,Social Workers ,Health literacy ,Health Services Accessibility ,03 medical and health sciences ,0302 clinical medicine ,Nursing ,Pregnancy ,Physicians ,Health care ,medicine ,Social position ,Humans ,Maternal Health Services ,030212 general & internal medicine ,Cultural Competency ,Qualitative Research ,Social policy ,Transients and Migrants ,030505 public health ,Social work ,business.industry ,Health Policy ,Public health ,Research ,Communication Barriers ,Public Health, Environmental and Occupational Health ,Health services research ,Quebec ,Migrant ,Country of origin ,Health services ,Childbirth ,Female ,Perception ,0305 other medical science ,business - Abstract
Background People who leave their country of origin, or the country of habitual residence, to establish themselves permanently in another country are usually referred to as migrants. Over half of all births in Montreal, Canada are to migrant women. To understand healthcare professionals’ attitudes towards migrants that could influence their delivery of care, our objective was to explore their perspectives of challenges newly-arrived migrant women from non-Western countries face when needing maternity care. Method In this qualitative multiple case study, we conducted face-to-face interviews with 63 health care professionals from four teaching hospitals in Montreal, known for providing maternity care to a high volume of migrant women. Interviews were transcribed and thematically analysed. Results Physicians, nurses, social workers, and therapists participated; 90% were female; and 17% were themselves migrants from non-Western countries. According to participants, newly-arrived migrant women face challenges at two levels: (a) direct care (e.g., understanding Canadian health care professionals’ expectations, communicating effectively with health care professionals), and (b) organizational (e.g., access to appropriate health care). Challenges women face are strongly influenced by the migrant woman’s background as well as social position (e.g., general education, health literacy, socio-cultural integration) and by how health care professionals balance women’s needs with perceived requirement to adhere to standard procedures and regulations. Conclusions Health care professionals across institutions agreed that maternity care-related challenges faced by newly-arrived migrant women often are complex in that they are simultaneously driven by conflicting values: those based on migrant women’s sociocultural backgrounds versus those related to the implementation of Canadian guidelines for maternity care in which consideration of migrant women’s particular needs are not priority.
- Published
- 2017
16. Measuring Perinatal Health Equity and Migration Indicators for International Comparisons
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Irene Sarasua, Anita J. Gagnon, Carly Lang, and Rhonda Small
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Cross-Cultural Comparison ,Internationality ,Health records ,Health Services Accessibility ,Pregnancy ,Risk Factors ,Perinatal health ,Environmental health ,Humans ,Country of birth ,Healthcare Disparities ,Socioeconomics ,Transients and Migrants ,International research ,International comparisons ,Equity (finance) ,Health Status Disparities ,Emigration and Immigration ,Health Surveys ,Perinatal Care ,Geography ,Socioeconomic Factors ,Health Care Surveys ,Population Surveillance ,General Health Professions ,Female ,Delivery of Health Care - Abstract
An international research collaboration answered, "Can equity in perinatal health for migrant women be measured for comparison across countries?" In nine countries, perinatal databases were assessed for the availability of equity indicators. Equity data were also sought from women and health records. Optimal sources of data differed depending on the migrant perinatal health equity indicator. Health and migration data, required to capture equity, were often not reported in the same location. Migration indicators other than country of birth were underreported. Perinatal health equity can be measured for international comparisons, although a standardized protocol is required to capture all indicators.
- Published
- 2014
17. A qualitative exploration of access to urban migrant healthcare in Nairobi, Kenya
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Anita J. Gagnon, Christine Arnold, and Jason Theede
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Adult ,Male ,Economic growth ,Kenya ,Health (social science) ,Adolescent ,Refugee ,Language barrier ,Health Services Accessibility ,Young Adult ,History and Philosophy of Science ,Political science ,Health care ,Urban Health Services ,Humans ,Qualitative Research ,Aged ,Transients and Migrants ,Government ,Right to health ,business.industry ,Focus Groups ,Middle Aged ,Focus group ,Harassment ,Female ,business - Abstract
In recent years, Kenya's capital city Nairobi has experienced an influx of international economic migrants, as well as migrants forced to flee their neighboring countries of origin, or coming from UNHCR-managed refugee camps into the city. Urban migrants regularly face challenges integrating with host communities and consequently face health vulnerabilities. The International Organization for Migration in Kenya was concerned about the potential marginalization of urban migrants from mainstream health programming and a lack of data upon which to base their activities. The purpose of this project was to gain a greater understanding of urban migrants' barriers to accessing healthcare in Nairobi compared with barriers faced by Kenyans living in the same locations. Guiding our work was a conceptual framework for assessing access to healthcare, which defines availability, geographic accessibility, financial accessibility and acceptability as the four dimensions of access. We identified key informants in collaboration with The National Organisation for Peer Educators, and these individuals assisted in identifying communities within Nairobi where large proportions of migrants reside. Four communities were selected for further study. In each, interviews with government officials and service providers were conducted, and focus group discussions were held with both migrants and Kenyans. Verbatim transcripts were content-analyzed using an open coding technique. Common barriers to accessing care that were shared by migrants and Kenyans included waiting times, drug availability, transportation and cost. Barriers unique to migrants were: threat of harassment; cost discrepancies between migrant and Kenyan clients; real or perceived discrimination; documentation requirements and language barriers. Despite articles from the 2010 Constitution of Kenya that assert the right to health for every person in Kenya, migrants continue to experience unique barriers in accessing healthcare. Efforts to eliminate these barriers should address policy-level interventions, strengthened networks and partnerships, improved migrant-sensitive services and especially continued research in migrant health.
- Published
- 2014
18. Accumulation, internalization and therapeutic efficacy of neuropilin-1-targeted liposomes
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Eric E. Paoli, Robert D. Cardiff, Katherine W. Ferrara, Elizabeth S. Ingham, Hua Zhang, M. Karen J. Gagnon, Sarah Tam, Azadeh Kheirolomoom, Brett Z. Fite, and Lisa M. Mahakian
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Contrast Media ,Pharmaceutical Science ,Gadolinium ,Peptide ,Optical imaging ,Polyethylene Glycols ,Mice ,Heterocyclic Compounds ,Antibiotics ,Neoplasms ,Pharmacology & Pharmacy ,Internalization ,Peptide sequence ,Cancer ,media_common ,chemistry.chemical_classification ,Oligopeptide ,Liposome ,Antibiotics, Antineoplastic ,Tumor ,Pharmacology and Pharmaceutical Sciences ,Chemical Engineering ,Antineoplastic ,Tumor Burden ,Biochemistry ,5.1 Pharmaceuticals ,Drug delivery ,Female ,Development of treatments and therapeutic interventions ,Oligopeptides ,medicine.drug ,Cell Survival ,media_common.quotation_subject ,Biomedical Engineering ,Bioengineering ,Cell Line ,In vivo ,Cell Line, Tumor ,Organometallic Compounds ,medicine ,Animals ,Humans ,Doxorubicin ,Toxicity ,Neuropilin-1 ,chemistry ,Liposomes ,Biophysics ,CendR - Abstract
Advancements in liposomal drug delivery have produced long circulating and very stable drug formulations. These formulations minimize systemic exposure; however, unfortunately, therapeutic efficacy has remained limited due to the slow diffusion of liposomal particles within the tumor and limited release or uptake of the encapsulated drug. Here, the carboxyl-terminated CRPPR peptide, with affinity for the receptor neuropilin-1 (NRP), which is expressed on both endothelial and cancer cells, was conjugated to liposomes to enhance the tumor accumulation. Using a pH sensitive probe, liposomes were optimized for specific NRP binding and subsequent cellular internalization using in vitro cellular assays. Liposomes conjugated with the carboxyl-terminated CRPPR peptide (termed C-LPP liposomes) bound to the NRP-positive primary prostatic carcinoma cell line (PPC-1) but did not bind to the NRP-negative PC-3 cell line, and binding was observed with liposomal peptide concentrations as low as 0.16mol%. Binding of the C-LPP liposomes was receptor-limited, with saturation observed at high liposome concentrations. The identical peptide sequence bearing an amide terminus did not bind specifically, accumulating only with a high (2.5mol%) peptide concentration and adhering equally to NRP positive and negative cell lines. The binding of C-LPP liposomes conjugated with 0.63mol% of the peptide was 83-fold greater than liposomes conjugated with the amide version of the peptide. Cellular internalization was also enhanced with C-LPP liposomes, with 80% internalized following 3h incubation. Additionally, fluorescence in the blood pool (~40% of the injected dose) was similar for liposomes conjugated with 0.63mol% of carboxyl-terminated peptide and non-targeted liposomes at 24h after injection, indicating stable circulation. Prior to doxorubicin treatment, in vivo tumor accumulation and vascular targeting were increased for peptide-conjugated liposomes compared to non-targeted liposomes based on confocal imaging of a fluorescent cargo, and the availability of the vascular receptor was confirmed with ultrasound molecular imaging. Finally, over a 4-week course of therapy, tumor knockdown resulting from doxorubicin-loaded, C-LPP liposomes was similar to non-targeted liposomes in syngeneic tumor-bearing FVB mice and C-LPP liposomes reduced doxorubicin accumulation in the skin and heart and eliminated skin toxicity. Taken together, our results demonstrate that a carboxyl-terminated RXXR peptide sequence, conjugated to liposomes at a concentration of 0.63mol%, retains long circulation but enhances binding and internalization, and reduces toxicity.
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- 2014
19. Assessing global partnerships in graduate nursing
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Address Malata, Amelia P. Birch, Anita J. Gagnon, and J. Tuck
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Canada ,Malawi ,Models, Educational ,Capacity Building ,business.industry ,International Educational Exchange ,Capacity building ,Pilot Projects ,Qualitative property ,Context (language use) ,Guideline ,Global Health ,Education ,Interinstitutional Relations ,Nursing ,General partnership ,Health care ,Humans ,Medicine ,Nurse education ,Cultural Competency ,business ,Education, Nursing, Graduate ,Cultural competence ,General Nursing - Abstract
North-South partnerships in graduate nursing education can prepare students to address global healthcare issues, increase cultural competence, and build research capacity. However, the current literature does not include a critical and systematic assessment of partnerships using established guidelines. This paper has two objectives: 1) Find and refine a suitable measure to assess a North-South inter-institutional research and clinical partnership in nursing; 2) Pilot test an assessment measure and describe the results of a systematic institutional self-evaluation of a developing North-South research and clinical partnership within a graduate nursing program. The first objective was addressed by searching for, examining and selecting an assessment measure. The second objective was obtained by applying the assessment measure to a developing graduate-level research and clinical partnership between a Canadian School of Nursing and a Malawian College of Nursing; qualitative data collected included information from a document review and subjective experiences of partners. Results showed that when appropriate revisions are made to an existing guideline, it is applicable to use as an assessment measure for North-South inter-institutional research and clinical partnerships. Recommendations for improvement were made, allowing the guideline to be more specific for research and clinical partnerships. Results demonstrated that the existing Canadian-Malawian partnership was strongest in the guideline category of "shaping the purpose and scope of the partnership," and weakest in "partnership implementation and context." This paper implies that: 1) evaluation can strengthen partnerships and enhance educational experience for nursing students; 2) research comparing and contrasting different genres of partnerships could help determine which type is the most appropriate for an institutions' particular outcome goals; and 3) effective establishment and maintenance of North-South partnership occurs through an on-going process of evaluation.
- Published
- 2013
20. Predictors of emergency cesarean delivery among international migrant women in Canada
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Anita J. Gagnon, Lisa Merry, and Kristen R. Haase
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medicine.medical_specialty ,Time Factors ,Refugee ,media_common.quotation_subject ,Immigration ,Emigrants and Immigrants ,Logistic regression ,03 medical and health sciences ,0302 clinical medicine ,Pregnancy ,Risk Factors ,Health insurance ,Birth Weight ,Humans ,Medicine ,030212 general & internal medicine ,Emergency Cesarean Delivery ,media_common ,Ontario ,Model migration ,Medically Uninsured ,Refugees ,030219 obstetrics & reproductive medicine ,British Columbia ,Cesarean Section ,business.industry ,Infant, Newborn ,Quebec ,Obstetrics and Gynecology ,General Medicine ,Odds ratio ,Confidence interval ,3. Good health ,Logistic Models ,Emergency medicine ,Income ,Female ,Emergencies ,business ,Demography - Abstract
Objective To determine the predictors of emergency cesarean delivery among international migrant women. Methods Between February 2006 and May 2009, 1025 postpartum migrant women were recruited from 12 hospitals in Toronto, Montreal, and Vancouver. Logistic regression was used to model migration, social, health service, and biomedical factors predictive of emergency cesarean. Results Overall, 14% percent of participants underwent emergency cesarean. The greatest risk was for women having their first delivery (odds ratio [OR], 5.9; 95% confidence interval [CI], 3.1–11.3); newborns weighing 4000 g or more (OR, 3.5; 95% CI, 1.9–6.5); no health insurance (OR, 2.8; 95% CI, 1.2–6.4); delivery on a Friday (OR, 2.2; 95% CI, 1.2–3.9); incomes of less than 30 000 Canadian dollars (OR, 1.9; 1.2–3.0); and induced labor (OR, 1.8; 95% CI, 1.1–3.0). Compared with immigrants, asylum seekers (OR, 0.3; 95% CI, 0.2–0.6) and refugees (OR, 0.5; 95% CI, 0.2–1.0) were protected against emergency cesarean. Conclusion Indicators specific to, or more common among, migrants were informative in assessing the likelihood of emergency cesarean. The risk associated with being uninsured, day of delivery, income, and immigration class suggests the importance of considering non-biomedical factors in reducing the need for emergency cesarean among migrants.
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- 2013
21. International migration to Canada: The post-birth health of mothers and infants by immigration class
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Lisa Merry, Geoffrey Dougherty, Cindy-Lee Dennis, Jean-François Saucier, Elizabeth Stanger, Becky Palmer, Anita J. Gagnon, Donna E. Stewart, and Olive Wahoush
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Postnatal Care ,Postpartum women ,Adult ,Economic growth ,Canada ,Health (social science) ,Refugee ,media_common.quotation_subject ,Health Status ,Immigration ,education ,Emigrants and Immigrants ,Mothers ,Health(social science) ,Cohort Studies ,03 medical and health sciences ,0302 clinical medicine ,History and Philosophy of Science ,Health care ,Childbirth ,Medicine ,Humans ,030212 general & internal medicine ,10. No inequality ,media_common ,Refugees ,030505 public health ,business.industry ,Emmigration and immigration ,Infant ,Emigration and Immigration ,3. Good health ,Access to health care ,Needs assessment ,Female ,0305 other medical science ,business ,Psychosocial ,Needs Assessment ,Demography ,Cohort study - Abstract
There are over 214 million international migrants worldwide, half of whom are women, and all of them assigned by the receiving country to an immigration class. Immigration classes are associated with certain health risks and regulatory restrictions related to eligibility for health care. Prior to this study, reports of international migrant post-birth health had not been compared between immigration classes, with the exception of our earlier, smaller study in which we found asylum-seekers to be at greatest risk for health concerns. In order to determine whether refugee or asylum-seeking women or their infants experience a greater number or a different distribution of professionally-identified health concerns after birth than immigrant or Canadian-born women, we recruited 1127 migrant (and in Canada
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- 2013
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22. Prediction of Duration of Breastfeeding among Migrant and Canadian-Born Women: Results from a Multi-Center Study
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Olive Wahoush, Cindy-Lee Dennis, Andraea Van Hulst, Anita J. Gagnon, and Geoff Dougherty
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Adult ,Canada ,medicine.medical_specialty ,Longitudinal study ,Breastfeeding ,Logistic regression ,Young Adult ,Surveys and Questionnaires ,medicine ,Humans ,Longitudinal Studies ,Prospective Studies ,Young adult ,Maternal Behavior ,Prospective cohort study ,Transients and Migrants ,Obstetrics ,business.industry ,medicine.disease ,Breast Feeding ,Pediatrics, Perinatology and Child Health ,Female ,business ,Breast engorgement ,Breast feeding ,Postpartum period ,Forecasting ,Demography - Abstract
To examine and compare predictors of breastfeeding duration among migrant and Canadian-born women.As part of a longitudinal study, a sample of 1503 mothers was recruited from 12 hospitals in Canada who completed questionnaires at 1 and 16 weeks postpartum. Following bivariate analysis, multivariate logistic regression analyses were completed to examine and compare predictors of continued breastfeeding at 16 weeks postpartum among migrant and Canadian-born women.Among migrant women, factors predictive of breastfeeding duration included maternal age ≥ 35 years, primiparity, and breast engorgement pain at 1 week postpartum. Factors predictive of discontinued breastfeeding in this group included maternal age20 years, higher gender-related development index of country of origin, no previous breastfeeding experience, breastfeeding duration of peers6 months, planned duration of exclusive breastfeeding6 months, and not exclusively breastfeeding at 1 week postpartum. Among Canadian-born women, factors predictive of breastfeeding duration included residence in Vancouver and maternal age ≥ 35 years. Factors predictive of discontinued breastfeeding included residence in Toronto, maternal age20 years, smoking at 16 weeks postpartum, primiparity, planned duration of exclusive breastfeeding6 months, and not exclusively breastfeeding at 1 week postpartum.Although certain predictors for breastfeeding duration were similar between migrant and Canadian-born women, several were dissimilar, suggesting that these groups might benefit from different strategies to optimize breastfeeding outcomes.
- Published
- 2013
23. Use of reproductive health care services among urban migrant women in Bangladesh
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Mohammad Mainul Islam and Anita J. Gagnon
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Adult ,Rural Population ,medicine.medical_specialty ,Adolescent ,Urban Population ,Population ,Reproductive medicine ,Birth rate ,Migrant women ,03 medical and health sciences ,0302 clinical medicine ,Pregnancy ,Environmental health ,Obstetrics and Gynaecology ,medicine ,Urban ,Humans ,030212 general & internal medicine ,education ,Child ,Contraception Behavior ,Reproductive health ,Medicine(all) ,Transients and Migrants ,education.field_of_study ,Bangladesh ,030219 obstetrics & reproductive medicine ,business.industry ,Internal migration ,Obstetrics and Gynecology ,Care services ,General Medicine ,Middle Aged ,Health Surveys ,Infant mortality ,female genital diseases and pregnancy complications ,Reproductive Medicine ,Socioeconomic Factors ,Family planning ,Female ,Reproductive Health Services ,Rural area ,business ,Research Article - Abstract
Background Recent internal migration flows from rural to urban areas pose challenges to women using reproductive health care services in their migratory destinations. No studies were found which examined the relationship between migration, migration-associated indicators and reproductive health care services in Bangladesh. Methods We analyzed the 2006 Bangladesh Urban Health Survey (data made publically available in June 2013) of 14,191 ever-married women aged 10–59 years. Cross tabulations and logistic regression were conducted. Results Migrants and non-migrants did not differ significantly in their use of modern contraceptives and treatment for STI but were less likely to receive ANC even after controlling for a range of variables. Compared to non-migrants, more migrants had home births, did not take vitamin A after delivery, and had no medical exam post-birth. Migrant women being village-born (rather than urban-born) were associated with risk of diminished: use of ANC; treatment for STI; medical exam post-birth; vitamin A post-birth. Migrating for work or education (rather than other reasons) was associated with risk of diminished: use of ANC; use of modern facilities for birth; and medical exam post-birth. Each additional year lived in urban areas was associated with a greater likelihood of receiving ANC. Conclusions Women who migrated to urban areas in Bangladesh were significantly less likely than non-migrants to use reproductive health care services related to pregnancy care. Pro-actively identifying migrant women, especially those who originated from villages or migrated for work or education may be warranted to ensure optimal use of pregnancy-related services.
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- 2016
24. Postpartum Pain in the Community Among Migrant and Non-migrant Women in Canada
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Abbey Mahon, Olivia Lu, Anita J. Gagnon, and Lisa Merry
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Postnatal Care ,medicine.medical_specialty ,Canada ,Epidemiology ,media_common.quotation_subject ,Immigration ,Alternative medicine ,Breast pain ,Maternal Welfare ,Emigrants and Immigrants ,Health Services Accessibility ,03 medical and health sciences ,0302 clinical medicine ,Nursing ,Patient-Centered Care ,medicine ,Humans ,Postpartum pain ,030212 general & internal medicine ,skin and connective tissue diseases ,media_common ,Language ,Refugees ,030219 obstetrics & reproductive medicine ,business.industry ,Public health ,Postpartum Period ,Public Health, Environmental and Occupational Health ,Prenatal Care ,Delivery, Obstetric ,Perineal tearing ,Socioeconomic Factors ,Family medicine ,Female ,medicine.symptom ,business ,Mastodynia - Abstract
International migrant women of childbearing age represent a large proportion of immigrants to high-income countries, yet research focusing on their postpartum health is limited. We investigated predictive factors for breast and non-breast pain 1 week post-birth in migrant and non-migrant women in Canada. Among migrant women, difficulty accessing health services; being from a middle-or high-income country; poor functionality in English and French; living with the father of their infant; and having no regular care provider were predictive of breast pain. Among non-migrant women, difficulties accessing health services, multiparity and prenatal education were predictive of breast pain, while receiving an epidural and having no regular care provider were predictive of non-breast pain. Among both groups, difficulties accessing health services and having no regular care provider were predictive of breast pain, while second degree or higher perineal tearing was predictive of non-breast pain. Migration-specific indicators should be considered in postpartum care planning.
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- 2016
25. Microfluidic System for Facilitated Quantification of Nanoparticle Accumulation to Cells Under Laminar Flow
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Katherine W. Ferrara, M. Karen J. Gagnon, Hua Zhang, Tingrui Pan, Scott I. Simon, and Jiro Kusunose
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Liposome ,Tumor Necrosis Factor-alpha ,Chemistry ,Ligand ,Microfluidics ,Biomedical Engineering ,Antibodies, Monoclonal ,Vascular Cell Adhesion Molecule-1 ,Nanoparticle ,Nanotechnology ,Laminar flow ,CD13 Antigens ,Ligands ,Article ,In vitro ,Liposomes ,Human Umbilical Vein Endothelial Cells ,Shear stress ,Biophysics ,Humans ,Nanoparticles ,Particle ,Oligopeptides - Abstract
The identification of novel, synthetic targeting ligands to endothelial receptors has led to the rapid development of targeted nanoparticles for drug, gene and imaging probe delivery. Central to development and optimization are effective models for assessing particle binding in vitro. Here, we developed a simple and cost effective method to quantitatively assess nanoparticle accumulation under physiologically-relevant laminar flow. We designed reversibly vacuum-sealed PDMS microfluidic chambers compatible with 35 mm petri dishes, which deliver uniform or gradient shear stress. These chambers have sufficient surface area for facile cell collection for particle accumulation quantitation through FACS. We tested this model by synthesizing and flowing liposomes coated with APN (K (D) ~ 300 μM) and VCAM-1-targeting (K (D) ~ 30 μM) peptides over HUVEC. Particle binding significantly increased with ligand concentration (up to 6 mol%) and decreased with excess PEG. While the accumulation of particles with the lower affinity ligand decreased with shear, accumulation of those with the higher affinity ligand was highest in a low shear environment (2.4 dyne/cm(2)), as compared with greater shear or the absence of shear. We describe here a robust flow chamber model that is applied to optimize the properties of 100 nm liposomes targeted to inflamed endothelium.
- Published
- 2012
26. Risk Factors for Posttreatment Edema in Patients Treated With Stereotactic Radiosurgery for Meningiomas
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Keith Unger, Walter C. Jean, Pamela Randolph-Jackson, Edward F Aulisi, Jeffrey Jacobson, C.E. Lominska, Robert L. White, Gregory J. Gagnon, and June Chanyasulkit
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Adult ,Male ,medicine.medical_treatment ,Brain Edema ,Radiation Dosage ,Radiosurgery ,Meningioma ,Postoperative Complications ,Risk Factors ,Cyberknife ,Edema ,Meningeal Neoplasms ,medicine ,Humans ,Aged ,Aged, 80 and over ,Univariate analysis ,business.industry ,Incidence ,Incidence (epidemiology) ,Middle Aged ,medicine.disease ,Tumor Burden ,Toxicity ,Female ,Surgery ,Neurology (clinical) ,medicine.symptom ,Complication ,business ,Nuclear medicine ,Follow-Up Studies - Abstract
Background: Peritumoral edema is a recognized complication following stereotactic radiosurgery (SRS). Objective: To evaluate the risk of posttreatment peritumoral edema following SRS for intracranial meningiomas and determine predictive factors. Methods: Between 2002 and 2008, 173 evaluable patients underwent CyberKnife or Gamma Knife SRS for meningiomas. Eighty-four patients (49%) had prior surgical resections, 13 patients had World Health Organization grade II (atypical) meningiomas, and 117 patients had a neurological deficit before SRS. Sixty-two tumors were in parasagittal, parafalcine, and convexity locations. The median tumor volume was 4.7 mL (range, 0.1–231.8 mL). The median prescribed dose and median prescribed biologically equivalent dose were 15 Gy (range, 9–40 Gy) and 67 Gy (range, 14–116 Gy), respectively. Ninety-seven patients were treated with single-fraction SRS, 74 received 2 to 5 fractions, and 2 received >5 fractions. Results: The median follow-up was 21.0 months. Thirteen patients (8%) developed symptomatic peritumoral edema, with a median onset time of 4.5 months (range, 0.2– 9.5 months). The 3-, 6-, 12-, and 24-month actuarial symptomatic edema rates were 2.9%, 4.9%, 7.7%, and 8.5%, respectively. The crude tumor control rate was 94%. On univariate analysis, large tumor volume (P = .01) and single-fraction SRS (P = .04) were predictive for development of posttreatment edema. Conclusion: SRS meningioma treatment demonstrated a low incidence of toxicity; however, large tumor volumes and single-fraction SRS treatment had an increased risk for posttreatment edema. Risk factors for edema should be considered in meningiomas treatment.
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- 2011
27. Refugee Claimant Women and Barriers to Health and Social Services Post-birth
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Anita J. Gagnon, Lisa Merry, Nahid Kalim, and Stephanie S. Bouris
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Adult ,Canada ,Social Work ,medicine.medical_specialty ,Referral ,Refugee ,Psychological intervention ,Mothers ,Health Services Accessibility ,Nursing ,Health care ,medicine ,Humans ,Prospective Studies ,Social determinants of health ,Qualitative Research ,Language ,Refugees ,business.industry ,Public health ,Postpartum Period ,Public Health, Environmental and Occupational Health ,Social Support ,General Medicine ,Health Literacy ,Social Class ,Income ,Educational Status ,Female ,business ,Psychosocial ,Postpartum period - Abstract
Objectives: Access to services for international migrants living in Canada is especially important during the postpartum period when additional health services and support are key to maternal and infant health. Recent studies found refugee claimant women to have a high number of postpartum health and social concerns that were not being addressed by the Canadian health care system. The current project aimed to gain greater understanding of the barriers these vulnerable migrant women face in accessing health and social services postpartum. Methods: Qualitative text data on services that claimant women received post-birth and notes (recorded by research nurses) about their experiences in accessing and receiving services were examined. Thematic analysis was conducted to identify common themes related to access barriers. Results: Of particular concern were the refusal of care for infants of mothers covered under IFHP, maternal isolation and difficulty for public health nurses to reach women postpartum. Also problematic was the lack of assessment, support and referrals for psychosocial concerns. Conclusions: Better screening and referral for high-risk claimant women and education of health care providers on claimants’ coverage and eligibility for services may improve the addressing of health and social concerns. Expansion of claimants’ health benefits to include psychotherapy without prior approval by Citizenship and Immigration Canada is also recommended. Interventions aimed at social determinants underlying health care access issues among childbearing refugee claimants should also be explored. These might include providing access to subsidized language courses, social housing and government-sponsored benefits for parents, which currently have restrictive eligibility that limits or excludes claimants’ access. Key words: Emigration and immigration; postpartum women; access to health care; refugees
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- 2011
28. Include Them and They Will Tell You: Learnings From a Participatory Process With Youth
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Giuseppina Di Meglio, Janet E. Rennick, Joseph Cox, Jo-Ann MacDonald, Anita J. Gagnon, and Claudia Mitchell
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Male ,Community-Based Participatory Research ,Adolescent ,Sexual Behavior ,Reflective writing ,Sexually Transmitted Diseases ,Exploratory research ,Human sexuality ,Sex Education ,Youth voice ,Risk-Taking ,Sex Factors ,Humans ,Sociology ,Reproductive health ,Medical education ,Schools ,business.industry ,Public Health, Environmental and Occupational Health ,Citizen journalism ,Gender studies ,Focus Groups ,Focus group ,Prince Edward Island ,Adolescent Behavior ,Dramatization ,Female ,business - Abstract
Encouraging youth voice, visibility, and active participation in adolescent-related research is strongly advocated in the literature. In this article, we describe how participatory approaches informed by arts-based methods (e.g., reflective writing, dramatization) were used with adolescents to enhance the research process in an exploratory study designed to develop and evaluate prevention resources for sexual risk-taking behaviors.Youth aged 15 to 17 years participated in iterative focus groups conducted over a 1-year period in school settings in Prince Edward Island, Canada. Descriptions of our experiences, strategies, and insights provide evidence for guiding practice to optimize adolescent participation in research.
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- 2011
29. Glossary: migration and health
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Anita J. Gagnon and Marcelo L. Urquia
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Gerontology ,Internationality ,Glossary ,Epidemiology ,business.industry ,Health Status ,Field (Bourdieu) ,Public Health, Environmental and Occupational Health ,MEDLINE ,social sciences ,Emigration and Immigration ,Acculturation ,Terminology ,behavior and behavior mechanisms ,Humans ,Medicine ,Narrative review ,Social science ,business - Abstract
The literature on migration and health is quite heterogeneous in how migrants are labelled and how the relation between migration and health is conceptualised. A narrative review has been carried out. This glossary presents the most commonly used terms in the field of migration and health, along with synonyms and related concepts, and discusses the suitability of their use in epidemiological studies. The terminology used in migrant health is ambiguous in many cases. Studies on migrant health should avoid layman terms and strive to use internationally defined concepts.
- Published
- 2011
30. Strengthening data quality in studies of migrants not fluent in host languages: A canadian example with reproductive health questionnaires
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Lisa Merry, Fay J. Strohschein, Anita J. Gagnon, and Julia Thomas
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Canada ,Health Knowledge, Attitudes, Practice ,Refugee ,Foreign language ,Population ,Sexually Transmitted Diseases ,HIV Infections ,law.invention ,Fluency ,law ,Surveys and Questionnaires ,Humans ,Medicine ,education ,General Nursing ,Language ,Reproductive health ,Refugees ,Communication ,Medical education ,education.field_of_study ,business.industry ,Communication Barriers ,Health Surveys ,language.human_language ,Test (assessment) ,Tamil ,CLARITY ,language ,Female ,business - Abstract
The need to collect health data from refugees and asylum seekers often requires that questionnaires be translated. Verifying the clarity, meaning, and acceptability of translated questionnaires with monolingual persons, individuals from the target population who primarily speak and understand only the test language, is one important step in the translation process. Reproductive health questionnaires were tested with persons monolingual in Hindi, Tamil, Urdu, Spanish, and French. Testing revealed problematic questions and how culture, education, and migration experience can affect perceptions of questions. Bilingual liaisons from the communities of interest facilitated recruitment of participants, but liaisons' vulnerable status and lack of familiarity with research posed challenges to the testing process. When conducting monolingual testing it is important to: carefully select liaisons (consider their gender, host-language fluency, knowledge of research processes, and comfort with the subject matter of the research); recruit monolingual persons with characteristics representative of the research population; ensure adequate researcher involvement in all aspects of the testing process to triangulate data collection from various sources.
- Published
- 2010
31. A Comparison of Low Birth Weight Among Newborns of Early Adolescents, Late Adolescents, and Adult Mothers in the Peruvian Amazon
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Eder Aguilar, Martin Casapia, Amee R. Manges, Serene A. Joseph, Anita J. Gagnon, Elham Rahme, Theresa W. Gyorkos, Hermánn Silva, and Julia A. Ryan
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Adult ,Male ,medicine.medical_specialty ,Time Factors ,Adolescent ,Epidemiology ,Cross-sectional study ,Birth weight ,Population ,Mothers ,Adolescent age ,Young Adult ,Pregnancy ,Risk Factors ,Peru ,Confidence Intervals ,Odds Ratio ,Humans ,Medicine ,Child ,education ,Maternal Welfare ,education.field_of_study ,business.industry ,Obstetrics ,Infant, Newborn ,Pregnancy Outcome ,Public Health, Environmental and Occupational Health ,Obstetrics and Gynecology ,Gestational age ,Health Status Disparities ,Infant, Low Birth Weight ,medicine.disease ,Low birth weight ,Cross-Sectional Studies ,Logistic Models ,Pediatrics, Perinatology and Child Health ,Female ,Reproductive Health Services ,medicine.symptom ,Live birth ,business ,Maternal Age - Abstract
To compare low birth weight (LBW
- Published
- 2010
32. Refugee maternal and perinatal health in Ontario, Canada: a retrospective population-based study
- Author
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Rahim Moineddin, Meb Rashid, Parisa Dastoori, Anita J. Gagnon, Donald C. Cole, Jennifer Blake, Marcelo L. Urquia, Joel G. Ray, Susitha Wanigaratne, and Yogendra Shakya
- Subjects
Canada ,medicine.medical_specialty ,Maternal Health ,medicine.medical_treatment ,Refugee ,media_common.quotation_subject ,Immigration ,Population ,Emigrants and Immigrants ,social medicine ,03 medical and health sciences ,perinatology ,0302 clinical medicine ,Pregnancy ,Epidemiology ,Health care ,medicine ,Humans ,Caesarean section ,030212 general & internal medicine ,education ,Retrospective Studies ,media_common ,Ontario ,Refugees ,maternal medicine ,education.field_of_study ,030219 obstetrics & reproductive medicine ,Cesarean Section ,business.industry ,Research ,Public health ,fungi ,Infant, Newborn ,Pregnancy Outcome ,food and beverages ,General Medicine ,3. Good health ,Cohort ,Female ,epidemiology ,Public Health ,business ,Demography - Abstract
Objectives Immigrants are thought to be healthier than their native-born counterparts, but less is known about the health of refugees or forced migrants. Previous studies often equate refugee status with immigration status or country of birth (COB) and none have compared refugee to non-refugee immigrants from the same COB. Herein, we examined whether: (1) a refugee mother experiences greater odds of adverse maternal and perinatal health outcomes compared with a similar non-refugee mother from the same COB and (2) refugee and non-refugee immigrants differ from Canadian-born mothers for maternal and perinatal outcomes. Design This is a retrospective population-based database study. We implemented two cohort designs: (1) 1:1 matching of refugees to non-refugee immigrants on COB, year and age at arrival (±5 years) and (2) an unmatched design using all data. Setting and participants Refugee immigrant mothers (n=34 233), non-refugee immigrant mothers (n=243 439) and Canadian-born mothers (n=615 394) eligible for universal healthcare insurance who had a hospital birth in Ontario, Canada, between 2002 and 2014. Primary outcomes Numerous adverse maternal and perinatal health outcomes. Results Refugees differed from non-refugee immigrants most notably for HIV, with respective rates of 0.39% and 0.20% and an adjusted OR (AOR) of 1.82 (95% CI 1.19 to 2.79). Other elevated outcomes included caesarean section (AOR 1.04, 95% CI 1.00 to 1.08) and moderate preterm birth (AOR 1.08, 95% CI 0.99 to 1.17). For the majority of outcomes, refugee and non-refugee immigrants experienced similar AORs when compared with Canadian-born mothers. Conclusions Refugee status was associated with a few adverse maternal and perinatal health outcomes, but the associations were not strong except for HIV. The definition of refugee status used herein may not sensitively identify refugees at highest risk. Future research would benefit from further refining refugee status based on migration experiences.
- Published
- 2018
33. South Asian migrant women and HIV/STIs: Knowledge, attitudes and practices and the role of sexual power
- Author
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Anita J. Gagnon, Lisa Merry, Ellen Rosenberg, Jacqueline Bocking, and Jacqueline Oxman-Martinez
- Subjects
Adult ,Male ,Health Knowledge, Attitudes, Practice ,Asia ,Health (social science) ,South asia ,media_common.quotation_subject ,Decision Making ,Geography, Planning and Development ,Immigration ,Population ,Sexually Transmitted Diseases ,HIV Infections ,urologic and male genital diseases ,Affect (psychology) ,Power (social and political) ,Acquired immunodeficiency syndrome (AIDS) ,Surveys and Questionnaires ,Asia, Western ,Humans ,Medicine ,education ,Health Education ,media_common ,Transients and Migrants ,education.field_of_study ,business.industry ,Quebec ,Public Health, Environmental and Occupational Health ,virus diseases ,medicine.disease ,Female ,Health education ,Power, Psychological ,business ,Developed country ,geographic locations ,Demography - Abstract
Differences in relationship power dynamics or migration factors may affect knowledge, attitudes, and practices (KAP) towards HIV/AIDS and sexually transmitted infections (STIs) in resettling Migrant women. A sample of 122 women and men born in India, Sri Lanka, Pakistan or Bangladesh and residing in Montreal completed questionnaires on HIV/STI KAP and decision-making power Within sexual relationships. Knowledge gaps and stigmatizing attitudes were found. STI/HIV information available in one's language and other educational strategies that consider women's Power may improve KAP among South Asian migrant women.
- Published
- 2010
34. Targeted In vivo Imaging of Integrin αvβ6 with an Improved Radiotracer and Its Relevance in a Pancreatic Tumor Model
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Jan Marik, Craig K. Abbey, Sven H. Hausner, Julie L. Sutcliffe, Cathy E. Stanecki, Richard J. Bold, John Marshall, and M. Karen J. Gagnon
- Subjects
Male ,Fluorine Radioisotopes ,Integrins ,Cancer Research ,Pathology ,medicine.medical_specialty ,Pancreatic disease ,Transplantation, Heterologous ,Melanoma, Experimental ,Alpha (ethology) ,Enzyme-Linked Immunosorbent Assay ,Benzoates ,Article ,Flow cytometry ,Mice ,Viral Proteins ,Antigens, Neoplasm ,In vivo ,Pancreatic tumor ,Cell Line, Tumor ,Animals ,Humans ,Medicine ,Tissue Distribution ,Beta (finance) ,medicine.diagnostic_test ,business.industry ,Flow Cytometry ,medicine.disease ,Pancreatic Neoplasms ,Transplantation ,Oncology ,Foot-and-Mouth Disease Virus ,Positron-Emission Tomography ,Cancer research ,Feasibility Studies ,Radiopharmaceuticals ,business ,Neoplasm Transplantation ,Preclinical imaging ,Protein Binding - Abstract
The cell surface receptor αvβ6 is epithelial specific, and its expression is tightly regulated; it is low or undetectable in adult tissues but has been shown to be increased in many different cancers, including pancreatic, cervical, lung, and colon cancers. Studies have described αvβ6 as a prognostic biomarker linked to poor survival. We have recently shown the feasibility of imaging αvβ6 in vivo by positron emission tomography (PET) using the peptide [18F]FBA-A20FMDV2. Here, we describe improved αvβ6 imaging agents and test their efficacy in a mouse model with endogenous αvβ6 expression. The modified compounds maintained high affinity for αvβ6 and >1,000-fold selectivity over related integrins (by ELISA) and showed significantly improved αvβ6-dependent binding in cell-based assays (>60% binding versus 23:1 and >47:1, respectively, were achieved at 4 hours. Significantly, [18F]FBA-PEG28-A20FMDV2 was superior to 2-[18F]fluoro-2-deoxy-d-glucose ([18F]FDG) in imaging the BxPC-3 tumors. Pancreatic ductal adenocarcinoma is highly metastatic and current preoperative evaluation of resectability using noninvasive imaging has limited success, with most patients having metastases at time of surgery. The fact that these tumors express αvβ6 suggests that this probe has significant potential for the in vivo detection of this malignancy, thus having important implications for patient care and therapy. [Cancer Res 2009;69(14):5843–50]
- Published
- 2009
35. Do Referrals Work? Responses of Childbearing Newcomers to Referrals for Care
- Author
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Christina Clausen, Anita J. Gagnon, J. F. Saucier, Franco A. Carnevale, J. Jeannotte, and Jacqueline Oxman-Martinez
- Subjects
Adult ,medicine.medical_specialty ,National Health Programs ,Referral ,Epidemiology ,media_common.quotation_subject ,Refugee ,Immigration ,Population ,Emigrants and Immigrants ,Language barrier ,Interviews as Topic ,Nursing ,Pregnancy ,Health care ,medicine ,Humans ,Maternal Health Services ,education ,Referral and Consultation ,media_common ,Refugees ,education.field_of_study ,business.industry ,Public health ,Quebec ,Public Health, Environmental and Occupational Health ,Family medicine ,Facilitator ,Female ,business - Abstract
Background Health care post-birth may include referrals for additional care. Migrant (i.e., refugee, asylum-seeker, and immigrant) women frequently do not follow-up referrals for care and could be at increased health risk as a consequence. We sought to explore the inhibitors and facilitators of migrant women for following through with referrals for care. Methods Twenty-five women living in Montreal who had received a referral completed semi-structured interviews. Results Inhibitors included language barriers, transportation problems, scheduling appointments, absence of husband, absence of childcare, cold weather, perceived inappropriate referrals, and cultural practice differences. Facilitators included choice of follow-up facilitator, appropriate services, empathetic professionals, and early receipt of information. Discussion Results indicate that migrant women may not be receiving the care they and their newborns need once a concern is identified. This suggests conceiving of a different approach to the care of this population post-birth, which could include partnering with social or religious networks.
- Published
- 2009
36. TREATMENT OF CHORDOMAS WITH CYBERKNIFE
- Author
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Fraser Henderson, Gregory J. Gagnon, Juliet Seigle, William Harter, Walter C. Jean, and Kyle McCool
- Subjects
Adult ,Male ,medicine.medical_specialty ,Universities ,medicine.medical_treatment ,Pain ,Kaplan-Meier Estimate ,Radiosurgery ,Central Nervous System Neoplasms ,Postoperative Complications ,Quality of life ,Cyberknife ,Statistical significance ,Chordoma ,medicine ,Humans ,Disseminated disease ,Aged ,Aged, 80 and over ,medicine.diagnostic_test ,business.industry ,Dose fractionation ,Magnetic resonance imaging ,Middle Aged ,medicine.disease ,Magnetic Resonance Imaging ,Surgery ,Treatment Outcome ,Quality of Life ,Female ,Dose Fractionation, Radiation ,Neurology (clinical) ,business - Abstract
OBJECTIVE: To determine the efficacy and safety of chordoma treatment with CyberKnife (Accuray, Inc., Sunnyvale, CA) stereotactic radiosurgery (CK/SRS). METHODS: Eighteen patients with chordoma were treated with CK/SRS as a primary adjuvant (17 patients) or the only treatment (1 patient). The series included 24 lesions (28 treatments). The median age of the patients was 60 years (range, 24-85 years). Forty-four percent of the tumors were located in the mobile spine, 39% inside the cranium, and 17% in the sacral region. The male-to-female ratio was 1:1. The mean tumor volume was 128.0 mL (range, 12.0-457.3 mL), and the median dose of 35 Gy (range, 24.0-40.0 Gy) was delivered in 5 sessions. The median follow-up period was 46 months (range, 7-65 months). RESULTS: There were 3 significant complications in patients with previous irradiation, including infection in the surgical/radiation site (2 patients) and decreased vision (1 patient). Improvement in pain and quality of life did not reach statistical significance (alpha = 0.05). Seven patients experienced recurrence at a median of 10 months (range, 5-38 months), and 4 patients with disseminated disease died 7 to 48 months after therapy. Two patients had a partial response, whereas 9 others had stable disease. The local control rate at 65 months was 59.1%, with an overall survival of 74.3% and disease-specific survival of 88.9%. We estimated an alpha/beta ratio of 2.45 for chordomas, which supports hypofractionation. CONCLUSION: The CK/SRS safety and efficacy profile compares favorably with those of other treatment delivery systems. CK/SRS appears to reduce tumor volume, given an adequate dose. The authors recommend treatment with 40 Gy in 5 sessions to the clinical treatment volume, which includes the gross tumor volume and at least a 1-cm margin.
- Published
- 2009
37. Stillbirths and infant deaths among migrants in industrialized countries
- Author
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Jennifer Zeitlin, Babill Stray-Pedersen, Mika Gissler, Alison Macfarlane, Anita J. Gagnon, Megan Zimbeck, Rhonda Small, and Sophie Alexander
- Subjects
medicine.medical_specialty ,Pediatrics ,Refugee ,Pregnancy ,Cause of Death ,Infant Mortality ,Epidemiology ,medicine ,Humans ,Cause of death ,Transients and Migrants ,Refugees ,business.industry ,Developed Countries ,Public health ,Infant, Newborn ,Infant ,Obstetrics and Gynecology ,General Medicine ,Stillbirth ,medicine.disease ,female genital diseases and pregnancy complications ,Infant mortality ,Systematic review ,population characteristics ,Female ,business ,Developed country ,Demography - Abstract
The relation of migration to infant outcomes is unclear. There are studies which show that some migrant groups have similar or even better outcomes than those from the receiving country. Equally, raised risk of adverse outcomes for other migrant groups has been reported.We sought to determine (1) if migrants in western industrialized countries have consistently higher risks of stillbirth, neonatal mortality, or infant mortality, (2) if there are migrant sub-groups at potentially higher risk, and (3) what might be the explanations for any risk differences found.Systematic review of the literature on perinatal health outcomes among migrants in western industrialized countries.Drawing on a larger systematic review of perinatal outcomes and migration, we reviewed studies including mortality outcomes (stillbirths and infant deaths).Eligible studies gave conflicting results. Half (53%) reported worse mortality outcomes, one third (35%) reported no differences and a few (13%) reported better outcomes for births to migrants compared to the receiving country population. Refugees were the most vulnerable group. For non-refugees, non-European migrants in Europe and foreign-born blacks in the United States had the highest excess mortality. In general, adjustment of background factors did not explain the increased mortality rate among migrants. Regarding causes of death, higher preterm birth rates explained the increased mortality figures among some migrant groups. The increased mortality from congenital anomalies may be related to restricted access to screening, but also to differing attitudes to screening and termination of pregnancy.Mortality risk among babies born to migrants is not consistently higher, but appears to be greatest among refugees, non-European migrants to Europe, and foreign-born blacks in the US. To understand this variation better, more information is needed about migrant background, such as length of time in receiving country and receiving country language fluency. Additional data on demographic, health care, biological, medical, and socioeconomic risk factors should be gathered and analyzed in greater detail.
- Published
- 2009
38. Somali women and their pregnancy outcomes postmigration: data from six receiving countries
- Author
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Jennifer Zeitlin, Guy Martens, Richard H. Glazier, Sarah McDermott, Edwige Haelterman, Siri Vangen, Marcelo L. Urquia, Rhonda Small, Mika Gissler, M. Bennis, and Anita J. Gagnon
- Subjects
Obstétrique ,Epidemiology ,pregnancy outcomes ,medicine.medical_treatment ,migration ,Somali ,Gynécologie ,0302 clinical medicine ,Pregnancy ,Risk Factors ,Infant Mortality ,Caesarean section ,030212 general & internal medicine ,Young adult ,Migration ,030219 obstetrics & reproductive medicine ,Obstetrics ,Pregnancy Outcome ,Obstetrics and Gynecology ,Stillbirth ,Emigration and Immigration ,Europe ,Premature birth ,Meta-analysis ,language ,Premature Birth ,Gestation ,stillbirth ,Female ,Maternal Age ,Adult ,Canada ,medicine.medical_specialty ,Somalia ,Young Adult ,03 medical and health sciences ,medicine ,Humans ,Pregnancy outcomes ,business.industry ,Australia ,Infant, Newborn ,Delivery, Obstetric ,medicine.disease ,language.human_language ,Infant mortality ,business - Abstract
Objective: This study aimed to investigate pregnancy outcomes in Somali-born women compared with those women born in each of the six receiving countries: Australia, Belgium, Canada, Finland, Norway and Sweden. Design: Meta-analyses of routinely collected data on confinements and births. Setting: National or regional perinatal datasets spanning 3-6 years between 1997 and 2004 from six countries. Sample: A total of 10 431 Somali-born women and 2 168 891 receiving country-born women. Methods: Meta-analyses to compare outcomes for Somali-born and receiving country-born women across the six countries. Main outcome measures: Events of labour (induction, epidural use and proportion of women using no analgesia), mode of birth (spontaneous vaginal birth, operative vaginal birth and caesarean section) and infant outcomes (preterm birth, birthweight, Apgar at 5 minutes, stillbirths and neonatal deaths). Results: Compared with receiving country-born women, Somali-born women were less likely to give birth preterm (pooled OR 0.72, 95% CI 0.64-0.81) or to have infants of low birthweight (pooled OR 0.89, 95% CI 0.82-0.98), but there was an excess of caesarean sections, particularly in first births (pooled OR 1.41, 95% CI 1.25-1.59) and an excess of stillbirths (pooled OR 1.86, 95% CI 1.38-2.51). Conclusions: This analysis has identified a number of disparities in outcomes between Somali-born women and their receiving country counterparts. The disparities are not readily explained and they raise concerns about the provision of maternity care for Somali women postmigration. Review of maternity care practices followed by implementation and careful evaluation of strategies to improve both care and outcomes for Somali women is needed. © 2008 The Authors., SCOPUS: ar.j, FLWOA, info:eu-repo/semantics/published
- Published
- 2008
39. One-on-One Coaching to Improve Pain Assessment and Management Practices of Pediatric Nurses
- Author
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Francoise Filion, Carla Shapiro, Jasmine Byron, Jaqueline Ellis, Hélène Patenaude, Judith A. Ritchie, Anita J. Gagnon, Celeste Johnston, Janet E. Rennick, and Christina Rosmus
- Subjects
Adult ,Canada ,Health Knowledge, Attitudes, Practice ,medicine.medical_specialty ,Attitude of Health Personnel ,Feedback, Psychological ,Interprofessional Relations ,education ,Psychological intervention ,Pain ,Context (language use) ,Audit ,Nursing Staff, Hospital ,Nurse's Role ,Pediatrics ,Coaching ,Social support ,Education, Nursing, Continuing ,Nursing ,Pain assessment ,Health care ,Humans ,Medicine ,Single-Blind Method ,Child ,Nursing Assessment ,Pain Measurement ,business.industry ,Nursing Audit ,Social Support ,Pediatric Nursing ,Nursing Education Research ,Nursing Evaluation Research ,Family medicine ,Preceptorship ,Clinical Competence ,business ,human activities ,Total Quality Management - Abstract
Pain in children is infrequently assessed and managed by nurses. One-on-one coaching based on audit with feedback and the use of opinion leaders have been effective in changing professional health care practices. Coaching by an opinion leader for changing pediatric nurses' pain practices was tested in a clustered randomized trial in six Canadian pediatric hospitals. The rate of pain assessments, nurses' knowledge, and nonpharmacological interventions increased in the coaching group. However, there were significant site differences that could not be attributed to the coaching but to factors inherent in the sites. The context in which interventions are implemented will influence the effectiveness of individualized interventions.
- Published
- 2007
40. Cyberknife radiosurgery for breast cancer spine metastases
- Author
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Edmund A. Gehan, Jefferson Moulds, Anatoly Dritschilo, Fraser Henderson, Gregory J. Gagnon, Donna Sanford, and Brian T. Collins
- Subjects
Cancer Research ,medicine.medical_specialty ,Matched-Pair Analysis ,medicine.medical_treatment ,Breast Neoplasms ,Radiation Dosage ,Radiosurgery ,Metastasis ,Postoperative Complications ,Breast cancer ,Cyberknife ,medicine ,Humans ,External beam radiotherapy ,Aged ,Spinal Neoplasms ,Performance status ,business.industry ,Middle Aged ,Prognosis ,medicine.disease ,Surgery ,Survival Rate ,Radiation therapy ,Treatment Outcome ,Oncology ,Case-Control Studies ,Female ,CyberKnife Radiosurgery ,business - Abstract
BACKGROUND. There are few options for breast cancer patients with spinal metastases recurrent within a previous radiation treatment field. CyberKnife radiosurgery has been used in our institution to treat such patients. To evaluate their outcomes, as there are no comparable radiation treatment options, the outcomes were compared between 18 patients with spinal metastases from breast cancer treated with CyberKnife stereotactic radiosurgery, 17 of which had prior radiotherapy to the involved spinal region and were progressing, and 18 matched patients who received conventional external beam radiotherapy (CRT) up-front for spinal metastases. METHODS. Radiosurgery was delivered in 3 to 5 fractions to doses ranging from 2100 to 2800 cGy. Women were matched to patients in a CRT group with respect to time from original diagnosis to diagnosis of metastases, estrogen receptor / progesterone receptor (ER/PR) status, presence or absence of visceral metastases, prior radiotherapy, and prior chemotherapy. Survival and complications were compared between treatment groups. Surviving patients were followed out to 24 months. RESULTS. The CyberKnife and CRT groups were comparable along all matching dimensions and in performance status before treatment. Outcomes of treatment were similar for patients in both groups; ambulation, performance status, and pain worsened similarly across groups posttreatment. Survival and the number of complications appeared to favor the CyberKnife group, but the differences did not reach statistical significance. CONCLUSIONS. The statistical comparability of the CyberKnife and CRT groups reflects the small sample size and stringent requirements for significance of the matched-pair analysis. Nevertheless, comparability in these difficult cases shows that salvage CyberKnife treatment is as efficacious as initial CRT without added toxicity. Cancer 2007. © 2007 American Cancer Society.
- Published
- 2007
41. Complications of Thoracic Computed Tomography–Guided Fiducial Placement for the Purpose of Stereotactic Body Radiation Therapy
- Author
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Carlos Jamis-Dow, Cristina A. Reichner, Blair Marshall, Gregory J. Gagnon, Brian T. Collins, Thomas Chang, Shakun Malik, Eric D. Anderson, Shadi Yousefi, and Filip Banovac
- Subjects
Adult ,Male ,Pulmonary and Respiratory Medicine ,Cancer Research ,medicine.medical_specialty ,Lung Neoplasms ,Percutaneous ,Radiography ,Radiosurgery ,Cyberknife ,Biopsy ,medicine ,Humans ,Aged ,Retrospective Studies ,medicine.diagnostic_test ,business.industry ,Pneumothorax ,Middle Aged ,medicine.disease ,Thoracostomy ,Oncology ,Concomitant ,Female ,Radiography, Thoracic ,Radiology ,Tomography, X-Ray Computed ,business ,Fiducial marker - Abstract
Purpose This study examined the complication rates associated with percutaneous fiducial placement for the purpose of stereotactic body radiation therapy of primary and metastatic lung neoplasms. Patients and Methods This is a retrospective review of computed tomography (CT) scans and follow-up chest radiographs of 48 consecutive patients who underwent CT-guided percutaneous fiducial placement. The effect of age, sex, number of fiducials placed, and performance of a concomitant biopsy on the complication rates were assessed. Results Of 48 patients with a total of 221 fiducials placed, 16 (33%) had a procedure-related pneumothorax. There was no significant difference in pneumothorax rate based on age ( P = 0.16), sex ( P > 0.99), and number of fiducials placed ( P = 0.21). Overall, 6 of 48 patients (12.5%) required a thoracostomy tube. Performance of a concomitant core needle biopsy at the time of fiducial placement was associated with pneumothorax rates of 64% compared with 26% without biopsies ( P = 0.03). Postprocedural CT demonstrated hemorrhage in 9 patients (19%). Two patients had hemoptysis; one required admission. Patients' age, sex, number of fiducials placed, and performance of concomitant biopsy had no statistically significant implications on parenchymal hemorrhage incidence. Conclusion Approximately one third of the patients develop a pneumothorax during CT-guided fiducial placement. Most are asymptomatic and do not require a thoracostomy. A concurrent biopsy at the time of fiducial placement is associated with an increased risk of pneumothorax. Hemorrhage occurs but is usually clinically insignificant.
- Published
- 2007
42. Prevalence, continuation, and identification of postpartum depressive symptomatology among refugee, asylum-seeking, non-refugee immigrant, and Canadian-born women: results from a prospective cohort study
- Author
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Lisa Merry, Cindy-Lee Dennis, Donna E. Stewart, and Anita J. Gagnon
- Subjects
Postpartum depression ,Predictive validity ,Adult ,medicine.medical_specialty ,Canada ,media_common.quotation_subject ,Refugee ,Immigration ,Emigrants and Immigrants ,Sensitivity and Specificity ,Depressive symptomatology ,Cohort Studies ,Depression, Postpartum ,03 medical and health sciences ,0302 clinical medicine ,Population Groups ,Predictive Value of Tests ,Pregnancy ,Early Medical Intervention ,medicine ,Prevalence ,Humans ,030212 general & internal medicine ,Prospective Studies ,Psychiatry ,Prospective cohort study ,media_common ,Psychiatric Status Rating Scales ,Refugees ,business.industry ,fungi ,food and beverages ,Obstetrics and Gynecology ,medicine.disease ,030227 psychiatry ,3. Good health ,Psychiatry and Mental health ,Early Diagnosis ,Edinburgh Postnatal Depression Scale ,Female ,business ,Postpartum period ,Needs Assessment ,Demography - Abstract
This study assessed the prevalence, continuation, and identification of maternal depressive symptomatology over the first 16 weeks postpartum among refugee, asylum-seeking, non-refugee immigrant, and Canadian-born women. A sample of 1125 women (143 refugees, 369 asylum-seekers, 303 non-refugee immigrant, and 310 Canadian-born) completed the Edinburgh Postnatal Depression Scale (EPDS) at 1 and 16 weeks postpartum. The sensitivity, specificity, and predictive power of the 1-week EPDS to identify women with elevated EPDS scores at 16 weeks were determined. The total number of women with EPDS scores9 for each group at 1 and 16 weeks, respectively, was 26.6 and 18.2 % for refugees; 25.2 and 24.1 % for asylum-seekers; 22.4 and 14.2 % for non-refugee immigrants, and 14.8 and 7.4 % for Canadian-born. Using the cut-off score of 9/10, the 1-week EPDS accurately classified 77.6 % refugee, 73.4 % asylum-seeking, 76.6 % non-refugee immigrant, and 85.5 % Canadian-born women at 16 weeks with or without postpartum depressive symptomatology. The 1-week EPDS was significantly correlated to the 16-week EPDS (r = 0.46, p 0.01). All groups were significantly more likely to exhibit depressive symptomatology at 16 weeks if they had EPDS scores9 at 1 week postpartum: refugees (OR = 6.9, 95 % CI = 2.8-17.3), asylum-seekers (OR = 4.0, 95 % CI = 2.4-6.7), non-refugee immigrants (OR = 3.8, 95 % CI = 2.0-7.6), and Canadian-born women (OR = 8.0, 95 % CI = 3.3-19.8). Our findings suggest that refugee, asylum-seeking, non-refugee immigrant, and Canadian-born women at risk of postpartum depression may be identified early in the postpartum period such that secondary preventive interventions may be implemented.
- Published
- 2015
43. Reproductive health research of women migrants to Western countries: A systematic review for refining the clinical lens
- Author
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Kara L. Redden and Anita J. Gagnon
- Subjects
medicine.medical_specialty ,media_common.quotation_subject ,Developing country ,Emigrants and Immigrants ,03 medical and health sciences ,0302 clinical medicine ,Nursing ,medicine ,Western world ,Humans ,Quality (business) ,030212 general & internal medicine ,Developing Countries ,Reproductive health ,media_common ,030505 public health ,business.industry ,Developed Countries ,Health services research ,Obstetrics and Gynecology ,General Medicine ,Culturally Competent Care ,Additional research ,Reproductive Health ,Family medicine ,Western World ,Female ,Reproductive Health Services ,Health Services Research ,0305 other medical science ,business ,Developed country - Abstract
Influxes of migrant women of childbearing age to Western receiving countries have made their reproductive health a priority in those countries. Yet, providing optimal care to these women may be hampered by an inadequate volume or quality of research to inform practice. We reviewed reports of studies recently published to assess the extent to which current research is able to inform reproductive health care practices for migrant women (i.e., those born in countries other than the receiving country)--in so doing, we sought to offer a view of the landscape from which clinicians may interpret relevant publications. Additionally, we sought to identify topics for which clinicians may choose to advocate for additional research to be performed.
- Published
- 2015
44. Multifunctional Nanoparticles Facilitate Molecular Targeting and miRNA Delivery to Inhibit Atherosclerosis in ApoE(-/-) Mice
- Author
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Dong Ju Son, Sandeep Kumar, Chan Woo Kim, Jai Woong Seo, Katherine W. Ferrara, Hanjoong Jo, Azadeh Kheirolomoom, Elizabeth S. Ingham, and M. Karen J. Gagnon
- Subjects
Multifunctional nanoparticles ,Cell ,General Physics and Astronomy ,Peptide ,Biology ,Article ,Apolipoproteins E ,Molecular targeting ,Mice ,microRNA ,Gene expression ,medicine ,Animals ,Humans ,General Materials Science ,Molecular Targeted Therapy ,multifunctional particles ,chemistry.chemical_classification ,Apoe mice ,General Engineering ,Gene Transfer Techniques ,targeted delivery ,Endothelial Cells ,Atherosclerosis ,Molecular biology ,3. Good health ,Cell biology ,anti-miRNA ,Disease Models, Animal ,MicroRNAs ,medicine.anatomical_structure ,chemistry ,Nanoparticles ,Endothelium, Vascular ,endothelial inflammation - Abstract
The current study presents an effective and selective multifunctional nanoparticle used to deliver antiatherogenic therapeutics to inflamed pro-atherogenic regions without off-target changes in gene expression or particle-induced toxicities. MicroRNAs (miRNAs) regulate gene expression, playing a critical role in biology and disease including atherosclerosis. While anti-miRNA are emerging as therapeutics, numerous challenges remain due to their potential off-target effects, and therefore the development of carriers for selective delivery to diseased sites is important. Yet, co-optimization of multifunctional nanoparticles with high loading efficiency, a hidden cationic domain to facilitate lysosomal escape and a dense, stable incorporation of targeting moieties is challenging. Here, we create coated, cationic lipoparticles (CCLs), containing anti-miR-712 (∼1400 molecules, >95% loading efficiency) within the core and with a neutral coating, decorated with 5 mol % of peptide (VHPK) to target vascular cell adhesion molecule 1 (VCAM1). Optical imaging validated disease-specific accumulation as anti-miR-712 was efficiently delivered to inflamed mouse aortic endothelial cells in vitro and in vivo. As with the naked anti-miR-712, the delivery of VHPK-CCL-anti-miR-712 effectively downregulated the d-flow induced expression of miR-712 and also rescued the expression of its target genes tissue inhibitor of metalloproteinase 3 (TIMP3) and reversion-inducing-cysteine-rich protein with kazal motifs (RECK) in the endothelium, resulting in inhibition of metalloproteinase activity. Moreover, an 80% lower dose of VHPK-CCL-anti-miR-712 (1 mg/kg dose given twice a week), as compared with naked anti-miR-712, prevented atheroma formation in a mouse model of atherosclerosis. While delivery of naked anti-miR-712 alters expression in multiple organs, miR-712 expression in nontargeted organs was unchanged following VHPK-CCL-anti-miR-712 delivery.
- Published
- 2015
45. Global and public health core competencies for nursing education: A systematic review of essential competencies
- Author
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Anita J. Gagnon, Kristin Hendricks, Megan Clark, and Marie Raffray
- Subjects
medicine.medical_specialty ,Health Personnel ,education ,MEDLINE ,CINAHL ,Global Health ,Education ,03 medical and health sciences ,0302 clinical medicine ,Nursing ,Global health ,Medicine ,Humans ,030212 general & internal medicine ,Nurse education ,Education, Nursing ,Curriculum ,General Nursing ,030504 nursing ,business.industry ,Public health ,Occupational health nursing ,Community health ,Clinical Competence ,Public Health ,0305 other medical science ,business - Abstract
Objectives Nurses are learning and practicing in an increasingly global world. Both nursing schools and nursing students are seeking guidance as they integrate global health into their learning and teaching. This systematic review is intended to identify the most common global and public health core competencies found in the literature and better inform schools of nursing wishing to include global health content in their curricula. Design Systematic review. Data Sources An online search of CINAHL and Medline databases, as well as, inclusion of pertinent gray literature was conducted for articles published before 2013. Review Methods Relevant literature for global health (GH) and public and community health (PH/CH) competencies was reviewed to determine recommendations of both competencies using a combination of search terms. Studies must have addressed competencies as defined in the literature and must have been pertinent to GH or PH/CH. The databases were systematically searched and after reading the full content of the included studies, key concepts were extracted and synthesized. Results and Conclusion Twenty-five studies were identified and resulted in a list of 14 global health core competencies. These competencies are applicable to a variety of health disciplines, but particularly can inform the efforts of nursing schools to integrate global health concepts into their curricula.
- Published
- 2015
46. Responses of International Migrant Women to Abuse Associated With Pregnancy
- Author
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Anita J. Gagnon and Praem Mehta
- Subjects
Adult ,medicine.medical_specialty ,Canada ,Anger management ,Sociology and Political Science ,Databases, Factual ,medicine.medical_treatment ,Poison control ,Violence ,Suicide prevention ,Occupational safety and health ,Gender Studies ,03 medical and health sciences ,0302 clinical medicine ,Pregnancy ,Surveys and Questionnaires ,Injury prevention ,medicine ,Humans ,030212 general & internal medicine ,Psychiatry ,Reproductive health ,030505 public health ,business.industry ,Pregnancy Outcome ,Human factors and ergonomics ,Emigration and Immigration ,medicine.disease ,Reproductive Health ,Spouse Abuse ,Female ,Medical emergency ,0305 other medical science ,business ,Law - Abstract
The current study aims to identify what newly arrived migrant women do, in the early months post-birth, to respond to abuse associated with pregnancy. Textual data from 59 migrant women were analyzed thematically to identify common responses to abuses. The most common response was to physically leave their countries of origin and move to Canada, or to move out of the shared dwelling. Other responses included taking legal action, remaining silent, reporting the abuse, seeking counseling, isolating themselves, and supporting anger management for the abuser. These results enhance our understanding of the decisions, including inaction, made by migrant women.
- Published
- 2015
47. Strengthening healthcare delivery in Haiti through nursing continuing education
- Author
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M, Clark, M, Julmisse, N, Marcelin, L, Merry, J, Tuck, and A J, Gagnon
- Subjects
Education, Nursing, Continuing ,Organizational Case Studies ,Humans ,Clinical Competence ,Curriculum ,Nursing Staff, Hospital ,Program Development ,Delivery of Health Care ,Haiti - Abstract
The aim of this paper was to (1) highlight nursing continuing education as a key initiative for strengthening healthcare delivery in low-resource settings, and (2) provide an example of a nursing continuing education programme in Haiti.Haiti and other low-resource settings face extreme challenges including severe shortages of healthcare workers, high rates of nurse out-migration and variations in nurse competency at entry-to-practice. Nursing continuing education has the potential to address these challenges and improve healthcare delivery through enhanced nurse performance and retention; however, it is underutilized in low-resource settings.A case study is presented from the Hôpital Universitaire de Mirebalais in Mirebalais, Haiti of a new nursing continuing education programme called the Beyond Expert Program.The case study highlights eight key dimensions of nursing continuing education in low-resource settings: (1) involving local stakeholders in planning process, (2) targeting programme to nurse participant level and area of care, (3) basing course content on local context, (4) including diverse range of nursing topics, (5) using participatory teaching methods, (6) addressing resource constraints in time and scheduling, (7) evaluating and monitoring outcomes, and (8) establishing partnerships. The case study provides guidance for others wishing to develop programmes in similar settings.Creating a nursing continuing education programme in a low-resource setting is possible when there is commitment and engagement for nursing continuing education at all levels of the organization.Our report suggests a need for policy-makers in resource-limited settings to make greater investments in nursing continuing education as a focus of human resources for health, as it is an important strategy for promoting nurse retention, building the knowledge and skill of the existing nursing workforce, and raising the image of nursing in low-resource settings.
- Published
- 2015
48. EUS-guided fiducial placement for CyberKnife radiotherapy of mediastinal and abdominal malignancies
- Author
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Sushil Ahlawat, Brian T. Collins, Gregory J. Gagnon, Aline Charabaty Pishvaian, and Nadim Haddad
- Subjects
Male ,medicine.medical_specialty ,Radiography ,medicine.medical_treatment ,Adenocarcinoma ,Radiosurgery ,Mediastinal Neoplasms ,Endosonography ,Anti-Infective Agents ,Ciprofloxacin ,Cyberknife ,medicine ,Humans ,Fluoroscopy ,Radiology, Nuclear Medicine and imaging ,Prospective Studies ,Aged ,Aged, 80 and over ,Porta hepatis ,medicine.diagnostic_test ,business.industry ,Gastroenterology ,Mediastinum ,Antibiotic Prophylaxis ,Middle Aged ,digestive system diseases ,Radiation therapy ,medicine.anatomical_structure ,Abdominal Neoplasms ,Female ,Radiology ,business ,Fiducial marker - Abstract
Background The CyberKnife frameless image-guided stereotactic radiosurgery system delivers radiation doses to tumors with high precision by use of real-time image guidance. Radiographic markers (or fiducials) implanted at the tumor site are used as reference points by the system to target the radiation beams. Diagnostic and interventional EUS have multiple applications in the multidisciplinary approach to tumors. Objective The goal of this prospective study was to evaluate the safety and feasibility of placing fiducials in mediastinal and intra-abdominal tumors under EUS guidance. Design Patients were evaluated for EUS-guided fiducial placement. A linear echoendoscope was used to localize the tumor, insert a 19-gauge fine needle in the target area, and place the fiducials through the needle lumen. The position of the fiducials was verified by EUS and by fluoroscopy. Setting Georgetown University Hospital, between February 2005 and August 2005. Patients Thirteen patients scheduled to undergo CyberKnife radiation therapy. Results EUS-guided fiducial placement was successful in a total of 11 of 13 patients (84.6%). The locations of the tumors were as follows: retrocrural area at the dome of the diaphragm, porta hepatis, gastroesophageal junction, mediastinum, thoracic paraspinal area, and pancreas. A total of 3 to 6 fiducials were placed in each patient. An infectious complication developed in 1 patient within 30 days of the procedure. Conclusion EUS-guided fiducial placement in lesions of the mediastinum and abdomen is a feasible and safe technique that can be used to mark a tumor site and guide CyberKnife radiation therapy. This new application of interventional EUS further expands the role of EUS in the multidisciplinary approach to the oncology patient.
- Published
- 2006
49. In-Hospital Formula Supplementation of Healthy Breastfeeding Newborns
- Author
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Kathy Waghorn, Anita J. Gagnon, Guylaine Leduc, Robert W. Platt, and Hong Yang
- Subjects
Adult ,Male ,Canada ,Pediatrics ,medicine.medical_specialty ,Time Factors ,Nurse Midwives ,Breastfeeding ,Health Promotion ,Hospitals, Maternity ,Nursing care ,Pregnancy ,medicine ,Humans ,Maternal Behavior ,Referral and Consultation ,Milk, Human ,business.industry ,Infant, Newborn ,Social Support ,Obstetrics and Gynecology ,Length of Stay ,Infant Formula ,Parity ,Breast Feeding ,Dietary Supplements ,Female ,business - Abstract
The UNICEF/WHO Baby-Friendly Hospital Initiative suggests that breastfeeding activities in hospital are important to later breastfeeding. Understanding reasons for in-hospital supplementation may help to optimize the successful implementation of this initiative. The objective was to identify predictors of in-hospital initial formula supplementation of healthy, breastfeeding newborns. The authors analyzed 564 Canadian mother-infant pairs and interviewed nurses. Half of the study infants (47.9%) received formula in hospital; the median age at first supplementation was 8.4 hours. Risk for supplementation was affected by birth occurring between 7 PM and 9 AM (hazard ratio [HR] varied with time) and high maternal trait anxiety (HR = 1.61, 95% confidence interval [CI] = 1.01, 2.59). The following variables were protective against supplementation: planning to exclusively breastfeed (HR = 0.46, 95% CI = 0.33, 0.64), planning to breastfeed for ≥ 3 months (HR = 0.56, 95% CI = 0.37-0.86), childbirth education (HR = 0.61, 95% CI = 0.43, 0.86), mother born in Canada (HR = 0.68, 95% CI = 0.53, 0.87), completion of community college (HR = 0.76, 95% CI = 0.59, 0.98), male infant (HR = 0.78, 95% CI = 0.61, 0.99), and breastfeeding at delivery (HR varied with time). Nurses reported breastfeeding problems, infant behavior, and maternal fatigue as reasons for supplementing. Reassessing patterns of night feeds and encouraging breastfeeding at delivery may decrease supplementation. Trait anxiety reduction and the role of infant gender in supplementation merit further study.
- Published
- 2005
50. Unraveling a Hotspot for TCR Recognition on HLA-A2: Evidence Against the Existence of Peptide-independent TCR Binding Determinants
- Author
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John R. Clemens, Tiffany K. Baxter, Rebecca L. Davis-Harrison, Susan J. Gagnon, William E. Biddison, Richard V. Turner, Kathryn M. Armstrong, Marale Damirjian, Brian M. Baker, and Oleg Y. Borbulevych
- Subjects
Models, Molecular ,T cell ,Static Electricity ,Receptors, Antigen, T-Cell ,chemical and pharmacologic phenomena ,Peptide ,Plasma protein binding ,Crystallography, X-Ray ,Major histocompatibility complex ,Protein–protein interaction ,Structural Biology ,HLA-A2 Antigen ,medicine ,Humans ,Molecular Biology ,Cells, Cultured ,chemistry.chemical_classification ,biology ,Lysine ,T-cell receptor ,MHC restriction ,Cell biology ,medicine.anatomical_structure ,Biochemistry ,chemistry ,Mutation ,biology.protein ,CD8 ,Protein Binding - Abstract
T cell receptor (TCR) recognition of peptide takes place in the context of the major histocompatibility complex (MHC) molecule, which accounts for approximately two-thirds of the peptide/MHC buried surface. Using the class I MHC HLA-A2 and a large panel of mutants, we have previously shown that surface mutations that disrupt TCR recognition vary with the identity of the peptide. The single exception is Lys66 on the HLA-A2 alpha1 helix, which when mutated to alanine disrupts recognition for 93% of over 250 different T cell clones or lines, independent of which peptide is bound. Thus, Lys66 could serve as a peptide-independent TCR binding determinant. Here, we have examined the role of Lys66 in TCR recognition of HLA-A2 in detail. The structure of a peptide/HLA-A2 molecule with the K66A mutation indicates that although the mutation induces no major structural changes, it results in the exposure of a negatively charged glutamate (Glu63) underneath Lys66. Concurrent replacement of Glu63 with glutamine restores TCR binding and function for T cells specific for five different peptides presented by HLA-A2. Thus, the positive charge on Lys66 does not serve to guide all TCRs onto the HLA-A2 molecule in a manner required for productive signaling. Furthermore, electrostatic calculations indicate that Lys66 does not contribute to the stability of two TCR-peptide/HLA-A2 complexes. Our findings are consistent with the notion that each TCR arrives at a unique solution of how to bind a peptide/MHC, most strongly influenced by the chemical and structural features of the bound peptide. This would not rule out an intrinsic affinity of TCRs for MHC molecules achieved through multiple weak interactions, but for HLA-A2 the collective mutational data place limits on the role of any single MHC amino acid side-chain in driving TCR binding in a peptide-independent fashion.
- Published
- 2005
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