18 results on '"Evans MP"'
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2. Perspectives on development and advancement of new tuberculosis vaccines
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Christopher da Costa, Christine S. Benn, Thomas Nyirenda, Evans Mpabalwani, Harleen M.S. Grewal, Rizwan Ahmed, Nathan Kapata, Peter S. Nyasulu, Markus Maeurer, David S. Hui, Delia Goletti, and Alimuddin Zumla
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Tuberculosis ,Vaccines ,BCG ,Prevention ,Immunity ,Advocacy ,Infectious and parasitic diseases ,RC109-216 - Abstract
Tuberculosis (TB) remains a leading cause of death worldwide and is estimated to have caused 1.3 million deaths worldwide in 2022. Approximately one quarter of the world's population are infected with Mycobacterium tuberculosis, of whom up to 10% will progress to developing active TB disease. Achieving the World Health Organization End TB Strategy targets of a 95% reduction in TB mortality and a 90% reduction in TB incidence worldwide by 2035 remains a daunting task. The continuing spread of multidrug-resistant TB adds another obstacle to achieving global TB control. Larger funding pledges coupled with technological advances have recently enabled the enhancement of TB vaccine development efforts. These are yielding a pipeline of over 17 products currently in different stages of clinical trials. Emerging promising phase I and II trial results and advancement to phase III trials have necessitated “vaccine preparedness” in parallel so that a smooth transition from any positive clinical trial result to phase IV evaluation and implementation into policy and practice can follow. Promotion of a human rights–based approach, which recognizes and upholds the fundamental rights of all affected by the disease, is essential to ensure universal access to quality TB vaccines, regardless of their background or personal circumstances.
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- 2024
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3. Malaria is the leading cause of acute kidney injury among a Zambian paediatric renal service cohort retrospectively evaluated for aetiologies, predictors of the need for dialysis, and outcomes.
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Chisambo Mwaba, Sody Munsaka, Bruce Bvulani, David Mwakazanga, Brian Chanda Chiluba, Kaiser Fitzwanga, and Evans Mpabalwani
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Medicine ,Science - Abstract
BackgroundWhilst malaria is a prominent aetiology associated with acute kidney injury (AKI) in many parts of Africa, a shift in the traditional AKI aetiologies has been witnessed in sections of the continent. Additionally, limited access to dialysis worsens patient outcomes in these low-resource settings. This retrospective cross-sectional study aimed to determine the associated aetiologies, predictors of need for dialysis and malaria-associated AKI (MAKI), and outcomes of AKI and dialysis among children evaluated by the renal service in Lusaka, Zambia.MethodsThe study sampled all children aged 16 years or below, diagnosed with AKI between 2017 and 2021, by the renal unit at the University Teaching Hospitals- Children's Hospital (UTH-CH), and retrospectively abstracted their records for exposures and outcomes. AKI was defined using the Kidney Disease Improving Global Outcomes (KDIGO) 2012 criteria. Frequency and percentage distributions were used to describe the occurrence of AKI aetiologies and treatment outcomes. Predictors of the need for dialysis, MAKI, and poor treatment outcome were identified by using multivariable logistic regression models.ResultsA total of 126 children diagnosed with AKI were included in this study. Malaria was the most frequent aetiology of AKI(61.1% (77/126, 95% Confidence Interval (CI): 52.0%-69.7%)). Of the 126 children with AKI, 74.6% (94) underwent dialysis. Predictors of the need for dialysis were oliguria (p = 0.0024; Odds ratio (OR) = 7.5, 95% CI: 2.1-27.7) and anuria (p = 0.0211; OR = 6.4, 95% CI = 1.3, 30.7). A fifth (18.3%, 23/126) of the children developed chronic kidney disease (CKD), 5.6% (7/126) died and, a year later, 77% (97/126) were lost to follow-up.ConclusionAt UTH-CH, malaria is the most frequent aetiology among children with AKI undergoing dialysis and children from low-medium malaria incidence areas are at risk; a considerable proportion of children with AKI need dialysis and Tenchoff catheter use in AKI is advocated.
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- 2023
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4. Phenotypic and genotypic antibiotic susceptibility profiles of Gram-negative bacteria isolated from bloodstream infections at a referral hospital, Lusaka, Zambia.
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Kaunda Yamba, Chileshe Lukwesa-Musyani, Mulemba Tillika Samutela, Christine Kapesa, Mudenda Bernard Hang'ombe, Evans Mpabalwani, Lottie Hachaambwa, Sombo Fwoloshi, Raphael Chanda, Mirfin Mpundu, Glory Kashweka, Ruth Nakazwe, Steward Mudenda, and John Bwalya Muma
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Public aspects of medicine ,RA1-1270 - Abstract
Bloodstream infections (BSI) caused by antimicrobial-resistant (AMR) Gram-negative bacteria (GNB) are a significant cause of morbidity and mortality. Third-generation cephalosporins (3GCs) have been used as empiric treatment for BSI and other invasive infections for years; however, their overuse could promote the emergence of extended-spectrum beta-lactamases (ESBLs). Thus, this study aimed to determine the epidemiological, clinical and microbiological features and the effects of antimicrobial resistance on the outcomes of BSIs at a referral hospital in Lusaka, Zambia. This was a six-month prospective facility-based study undertaken at a referral hospital in Lusaka, Zambia. As part of the routine diagnosis and patient care, blood samples for bacteriological culture were collected from patients presenting with fever and processed for pathogen identification and antimicrobial susceptibility testing using the VITEK 2 Compact instrument. ESBLs and plasmid-mediated quinolone resistance (PMQR) associated genes were determined using the polymerase chain reaction method. Patient information was collected using a structured data collection sheet and entered in CSpro 7.6. Data were analysed in WHOnet and STATA version 14. A total of 88 GNB were isolated, of which 76% were Enterobacterales, 14% Acinetobacter baumannii and 8% Pseudomonas aeruginosa. Resistance to third and fourth-generation cephalosporins was 75% and 32%, respectively. Noteworthy was the high prevalence (68%) of inappropriate empirical treatment, carbapenem resistance (7%), multi-drug resistance (83%) and ESBL-producers (76%). In comparison to E. coli as a causative agent of BSI, the odds of death were significantly higher among patients infected with Acinetobacter baumannii (OR = 3.8). The odds of death were also higher in patients that received 3GCs as empiric treatment than in those that received 4GCs or other (none cephalosporin) treatment options. Structured surveillance, yearly antibiogram updates, improved infection control and a well functional antimicrobial stewardship (AMS) program, are of utmost importance in improving appropriate antimicrobial treatment selection and favourable patient outcomes.
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- 2023
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5. Rotavirus breakthrough infections responsible for gastroenteritis in vaccinated infants who presented with acute diarrhoea at University Teaching Hospitals, Children's Hospital in 2016, in Lusaka Zambia.
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Julia Simwaka, Mapaseka Seheri, Gina Mulundu, Patrick Kaonga, Jason M Mwenda, Roma Chilengi, Evans Mpabalwani, and Sody Munsaka
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Medicine ,Science - Abstract
BackgroundIn Zambia, before rotavirus vaccine introduction, the virus accounted for about 10 million episodes of diarrhoea, 63 000 hospitalisations and 15 000 deaths in 2015, making diarrhoea the third leading cause of death after pneumonia and malaria. In Zambia, despite the introduction of the vaccine acute diarrhoea due to rotaviruses has continued to affect children aged five years and below. This study aimed to characterise the rotavirus genotypes which were responsible for diarrhoeal infections in vaccinated infants aged 2 to 12 months and to determine the relationship between rotavirus strains and the severity of diarrhoea in 2016.MethodsStool samples from infants aged 2 to 12 months who presented to the hospital with acute diarrhoea of three or more episodes in 24 hours were tested for group A rotavirus. All positive specimens that had enough sample were genotyped using reverse transcriptase Polymerase Chain Reaction (RT-PCR). A 20-point Vesikari clinical score between 1-5 was considered as mild, 6-10 as moderate and greater or equal to 11 as severe.ResultsA total of 424 stool specimens were tested of which 153 (36%, 95% CI 31.5% to 40.9%) were positive for VP6 rotavirus antigen. The age-specific rotavirus infections decreased significantly (p = 0.041) from 2-4 months, 32.0% (49/118) followed by a 38.8% (70/181) infection rate in the 5-8 months' category and subsequently dropped in the infants aged 9-12 months with a positivity rate of 27.2%. 38.5% of infants who received a single dose, 34.5% of those who received a complete dose and 45.2% (19/42) of the unvaccinated tested positive for rotavirus. The predominant rotavirus genotypes included G2P[6] 36%, G1P[8] 32%, mixed infections 19%, G2P[4] 6%, G1P[6] 4% and G9P[6] 3%.Discussion and conclusionResults suggest breakthrough infection of heterotypic strains (G2P[6] (36%), homotypic, G1P[8] (32%) and mixed infections (19%) raises concerns about the effects of the vaccination on the rotavirus diversity, considering the selective pressure that rotavirus vaccines could exert on viral populations. This data indicates that the rotavirus vaccine has generally reduced the severity of diarrhoea despite the detection of the virus strains.
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- 2021
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6. Feasibility of Implementing an Early Intervention Program in an Urban Low-Income Setting to Improve Neurodevelopmental Outcome in Survivors Following Birth Asphyxia
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Elwyn Chomba, Waldemar A Carlo, Elizabeth M. McClure, Fred Basini, Linda L.Wright, Evans Mpabalwani, Musaku Mwenechanya, Lineo Thahane, and Jan L. Wallander
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birth asphyxia ,children ,early intervention program ,global health ,low income ,neonatal mortality ,Social Sciences - Abstract
Birth asphyxia is a leading cause of neonatal mortality, accounting for 23% of neonatal deaths. An early intervention program (EIP) could improve neuro-developmental outcomes in survivors of birth asphyxia, but its feasibility in low-income countries has not been tested. In this pilot study in Zambia, eighty live-born infants > 1500 g of weight who had birth asphyxia and received resuscitation with bag and mask were enrolled for a study of standard care or EIP. Mothers/babies pairs were randomized into control (standard care) and intervention (EIP) groups and were followed up at home on a bi-weekly basis from 8 weeks to 8 months of age. Forty two mothers/babies (52.5%) completed the study at 8 months. Reasons for not completing the study were: 19 (50.1%) were lost to follow up, 16 (42.1%) withdrew, and 3 (7.8%) died. Follow-up to 8 months of age was not feasible for the majority in a large urban city with a low income population. Thus, interventions for children who have suffered birth asphyxia that require additional health care visits may not be currently feasible in the setting tested. There is a need to conduct further EIP studies to determine ways to improve follow up rates of children surviving birth asphyxia. Integrating early intervention programs with other successful health programs, such as the existing immunization programs, may improve follow up rates.
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- 2011
7. Scheduling of energy storage.
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Zachary S, Tindemans SH, Evans MP, Cruise JR, and Angeli D
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The increasing reliance on renewable energy generation means that storage may well play a much greater role in the balancing of future electricity systems. We show how heterogeneous stores, differing in capacity and rate constraints, may be optimally, or nearly optimally, scheduled to assist in such balancing, with the aim of minimizing the total imbalance (unserved energy) over any given period of time. It further turns out that in many cases the optimal policies are such that the optimal decision at each point in time is independent of the future evolution of the supply-demand balance in the system, so that these policies remain optimal in a stochastic environment. This article is part of the theme issue 'The mathematics of energy systems'.
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- 2021
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8. Editors' Notes.
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Evans MP and Abowitz KK
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- Adolescent, Humans, Education, Leadership, Students
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- 2015
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9. The development of collective moral leadership among parents through education organizing.
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Evans MP and Shirley D
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- Adolescent, Child, Community Participation, Humans, Social Change, Cooperative Behavior, Education, Leadership, Morals, Organizations, Parents
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It is often assumed that parent participation in schools is primarily based on self-interest and that this is a frequent source of contention between parents and teachers. This article examines the experiences of members of the Jamaica Plain Parent Organizing Project (JP-POP), a community-based organization in Boston, and reveals that some parents have learned to act beyond their individual self-interest and to organize on behalf of the entire community as a result of their participation. The authors present qualitative data from interviews with JP-POP members to ascertain the motivations behind their initial decisions to become involved in education, the benefits they derive from their participation, and the gradual evolution of narrow definitions of self-interest to more communal understandings. Finally, they draw out implications for the potential capacity enhancement of community-based organizations in education at both the institutional and district levels.
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- 2008
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10. Controlled degradation and macrophage responses of a fluoride-treated polycaprolactone.
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Gough JE, Christian P, Unsworth J, Evans MP, Scotchford CA, and Jones IA
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- Animals, Biodegradation, Environmental, Boranes chemistry, Cell Division drug effects, Cell Line, Glycerol chemistry, Hydrogen Peroxide metabolism, Interleukin-1 biosynthesis, Mice, Fluorides chemistry, Macrophage Activation drug effects, Macrophages metabolism, Polyesters chemical synthesis, Polyesters pharmacology
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We have developed a new bone replacement material based on polycaprolactone (PCL), which can act as a suitable matrix for monomer transfer molding of degradable composites. A boron trifluoride catalyst with glycerol additive was used to produce PCL with a degradation rate that can be altered by treatment with fluoride ions. The effect of cations on the degradation of the polymer and macrophage cell responses are discussed. We found that treatment with fluoride ions reduced the degradation rate. No significant difference between these three fluorides was observed although a general trend was seen where KF-treated PCL appeared to degrade slower than NaF-treated PCL which was slower than NH(4)F-treated PCL. Variation in solubilities of the salts was observed where the K(+) cation had the highest solubility and the Na(+) cation had the lowest solubility, which suggests that NaF was able to degrade the polymer more efficiently than the other fluorides. No significant macrophage activation was observed after culture on the polymer surfaces as determined by peroxide and IL-1 beta release, whereas some activation occurred after culture in degradation products., (Copyright 2004 Wiley Periodicals, Inc. J Biomed Mater Res 69A: 17-25, 2004)
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- 2004
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11. Levonorgestrel contraceptive implants in female patients 14 to 21 years old.
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Suman VJ, Van Winter JT, Evans MP, Simmons PS, Jacobsen SJ, and Manolis AL
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- Adolescent, Adult, Contraception methods, Contraceptive Agents, Female adverse effects, Female, Humans, Levonorgestrel adverse effects, Pregnancy, Retrospective Studies, Contraceptive Agents, Female therapeutic use, Levonorgestrel therapeutic use
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Objective: To determine which factors are associated with duration of use of a levonorgestrel implant (Norplant) for contraception in adolescents and young adults., Design: We retrospectively studied 144 young women (14 to 21 years of age) who chose a levonorgestrel contraceptive implant at Mayo Clinic Rochester between April 1990 and December 1993., Material and Methods: The following information was obtained at the time of insertion of the implant and from any follow-up visits: demographics, prior contraceptive experiences, frequency and management of complications, complications noted at removal of the implant, and subsequent contraceptive choice. The duration of use was examined., Results: Of the 144 young women who underwent insertion of a Norplant system, 75 telephoned or made a medical appointment because of implant-related side effects. During the follow-up period, 64 patients had the Norplant system removed. The Kaplan-Meier estimate of the probability of the Norplant system remaining in place for at least 12 months was 83 % and for at least 24 months was 63 %. Duration of Norplant use was not found to differ with respect to age, prior contraceptive use, or timing of insertion, but it was significantly shorter among those with a prior pregnancy than in those who had never been pregnant., Conclusion: These findings suggest that a group of young women who are likely to continue use of a contraceptive implant (with or without treatment for side effects) are those who have never been pregnant.
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- 1998
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12. Pregnancy after pancreatic-renal transplantation because of diabetes.
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Van Winter JT, Ogburn PL Jr, Ramin KD, Evans MP, and Velosa JA
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- Adult, Female, Graft Survival, Humans, Diabetes Mellitus, Type 1 surgery, Kidney Transplantation, Pancreas Transplantation, Pregnancy
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In this article, we describe two pregnancies in the same patient after pancreatic-renal transplantation. Severe, labile hypertension necessitated delivery at 35 weeks during the patient's first pregnancy and at 30 weeks (associated with renal graft obstruction) during her second pregnancy. Women with insulin-dependent diabetes mellitus who undergo pancreatic-renal transplantation can have a successful pregnancy if adequate multidisciplinary, specialized medical care is rendered.
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- 1997
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13. Endometrial neoplasia: prognostic significance of ploidy status.
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Evans MP and Podratz KC
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- Aneuploidy, DNA, Neoplasm analysis, Diploidy, Endometrial Neoplasms surgery, Female, Flow Cytometry, Gene Expression, Genes, p53, Humans, Image Cytometry, Mutation, Oncogenes, Paraffin Embedding, Prognosis, DNA, Neoplasm genetics, Endometrial Neoplasms genetics, Ploidies
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For several decades, clinical and histologic assessment of various phenotypic properties has provided a basis for treatment planning. However, it is recognized that, preoperatively, clinical assessment identifies only 20% of patients with advanced disease. Furthermore, the variability in intraoperative sampling, the subjectivity and limitations of histologic interpretation, and the variability in response to standardized treatment modalities represent concerns associated with the current treatment of endometrial carcinoma. Presumably, early dissemination, early recurrence, treatment refractoriness and, ultimately, compromised survival are reflections of the inherent biologic characteristics of the tumor. A reasonable assumption is that proscribed molecular events determine various behavioral characteristics of tumors that become manifested at the time of transformation rather than evolving as the tumor volume increases. Therefore, the identification of one or more of these quantifiable molecular variables that directly or indirectly assess tumor biology would assist clinicians in determining patient risk status and in selecting treatment options. As noted, DNA ploidy is an independent, broadly applicable, quantifiable predictor of progression-free survival in patients with endometrial cancer and, therefore, warrants designation as a major prognostic factor or therapeutic determinant. Aneuploidy implies the presence of an abnormal quantity of genomic material and imparts a progressively less favorable prognosis as the DNA index increases. These assayable aberrancies of cellular DNA content presumably reflect the more extreme alterations at the molecular level. Because neoplastic transformation is generally a multistep process, aberrations in several proto-oncogenes or tumor suppressor genes (or both) presumably must be realized before a clinical malignancy develops. A number of genes that encode for various regulatory proteins are overexpressed in endometrial cancer. Whether these aberrancies are fundamental to the pathogenesis of this disease process is unclear. Nevertheless, there appears to be an association between DNA ploidy and the overexpression of several regulatory genes, such as c-fms, K-ras, HER-2/neu, and p53. Although overexpression of these oncogenes and tumor suppressor genes harbor prognostic significance in endometrial cancer, the ploidy status of the tumor appears to represent the most cogent objective variable. As the etiopathogenesis of endometrial carcinoma becomes more discernible, one can envision a limited number of tissue-specific molecular-genetic indices characterizing the risk status of patients. Because the estimated number of deaths from endometrial cancer has doubled since 1987, reassessing of the therapeutic determinants for this disease process is important. The management objective for endometrial cancer by the turn of the century should be the identification of patients at high risk for advanced disease or post-treatment recurrences (or both) at the time of clinical declaration of symptoms and diagnosis. Such pretreatment identification would afford patients at high risk for advanced or recurrent disease access to physicians with special expertise and would facilitate the evaluation and application of new or modified therapeutic modalities. Equally important would be the identification of patients at low risk for untoward outcome, thereby avoiding the cost and morbidity of excessive therapeutic measures.
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- 1996
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14. Urinary incontinence in the elderly population.
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Chutka DS, Fleming KC, Evans MP, Evans JM, and Andrews KL
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- Aged, Humans, Referral and Consultation, Urinary Incontinence classification, Urinary Incontinence etiology, Urinary Incontinence therapy
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Objective: To describe the causes, evaluation, and management of urinary incontinence in the elderly population., Design: We reviewed pertinent articles in the medical literature and summarized the types of incontinence and contributing factors., Results: Urinary incontinence is common in elderly patients and often has a major role in determining whether a person can remain independent in the community or requires nursing home placement. Urinary incontinence is not a single entity but rather several different conditions, each with specific symptoms, findings on examination, and recommended treatment. Thus, accurate classification is important for appropriate management. Because of the complexity of urinary incontinence, many physicians are uncomfortable with undertaking assessment and treatment. Hence, many patients are not asked about incontinence, and the condition remains untreated and often considered a natural consequence of the aging process. Urinary incontinence can be treated and either cured or alleviated with treatment., Conclusion: Elderly patients should be asked about symptoms of urinary incontinence because appropriate assessment and treatment can usually provide relief.
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- 1996
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15. Hormone replacement therapy: management of common problems.
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Evans MP, Fleming KC, and Evans JM
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- Female, Humans, Estrogen Replacement Therapy adverse effects, Estrogen Replacement Therapy methods
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Objective: To describe common pitfalls associated with hormone replacement therapy (HRT) and recommendations to prevent or ameliorate them., Design: After pertinent articles and texts were reviewed, we outlined the available regimens of HRT, the commonly encountered side effects, and the management options., Results: HRT is frequently prescribed for elderly women. Vaginal bleeding, nausea, breast tenderness, migraine headaches, mood alterations, and abdominal bloating are common occurrences with HRT. These problems often can be managed by changing the dose, using another preparation or regimen, or altering the route of administration. For example, transdermal administration of estradiol may be tolerated better than oral therapy in patients with nausea. Irregular bleeding warrants endometrial biopsy to rule out hyperplasia., Conclusion: With simple measures, common side effects of HRT can easily be managed by primary-care physicians. Gynecologic referral is recommended when endometrial biopsy is necessary or when symptoms fail to respond to adjustments in hormone therapy.
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- 1995
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16. Surface-structure determination of Sc(0001) using LEED and STM.
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Dhesi SS, White RG, Patchett AJ, Evans MP, Lee MH, Blyth RI, Leibsle FM, and Barrett SD
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- 1995
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17. DNA ploidy of ovarian granulosa cell tumors. Lack of correlation between DNA index or proliferative index and outcome in 40 patients.
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Evans MP, Webb MJ, Gaffey TA, Katzmann JA, Suman VJ, and Hu TC
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- Adolescent, Adult, Aged, Aged, 80 and over, Aneuploidy, Cell Division, Child, Child, Preschool, Diploidy, Disease-Free Survival, Female, Follow-Up Studies, Granulosa Cell Tumor pathology, Humans, Middle Aged, Neoplasm Recurrence, Local genetics, Neoplasm Recurrence, Local pathology, Ovarian Neoplasms pathology, S Phase, Survival Rate, Treatment Outcome, DNA genetics, Granulosa Cell Tumor genetics, Ovarian Neoplasms genetics, Ploidies
- Abstract
Background: Most cases of granulosa cell tumor of the ovary are characterized by relatively good outcome; however, some tumors behave aggressively, and some tend to recur many years after the initial diagnosis. Because DNA ploidy has been shown to predict biologic behavior better than conventional prognostic variables in many types of genitourinary tumors, the DNA ploidy of granulosa cell tumors was studied to determine if this test correlates with recurrence or survival., Methods: Paraffin embedded tissue blocks were available from the primary ovarian tumors of 40 patients. DNA ploidy, percent S-phase fraction, and proliferative index were determined for each sample and were compared with patient outcome., Results: Of the 40 tumors, 33 were DNA diploid, 5 were DNA near diploid/aneuploid, and 2 were aneuploid. The Kaplan-Meier estimate of the probability of tumors not recurring within 5 years postoperatively was 0.907 (95% confidence interval: 0.811, 1.00)., Conclusions: There is insufficient evidence to claim that the DNA pattern is associated with morphology, stage of disease at diagnosis, or tumor size or that either survival or progression free survival differs with respect to any of the conventional prognostic factors considered. However, progression free survival tends to be shorter for those whose maximal tumor dimension was at least 10 cm (borderline significance, P = 0.0597), and survival time tends to be shorter for those with a high proliferative index (P = 0.0008).
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- 1995
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18. A comparative study of alternative bone-conduction calibration methods.
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Lankford JE and Evans MP
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- Adolescent, Adult, Calibration, Female, Humans, Male, Methods, Middle Aged, Audiometry instrumentation, Bone Conduction
- Abstract
The accepted instrument for calibrating the bone-conduction section of an audiometer is the artificial mastoid. For a variety of reasons, alternative calibration methods are in general use. Three common methods are: (1) the input voltage method; (2) the real-ear threshold method using normal-hearing listeners; and (3) the real-ear threshold method using subjects with sensorineural hearing loss. The present investigation compared these methods for both accuracy and efficiency. There were no significant differences in accuracy found among the three calibration methods. Substantial differences in efficiency were noted, however. When accuracy and efficiency are considered, the input voltage method appears to be the best alternative method for calibrating the bone-conduction system of an audiometer.
- Published
- 1981
- Full Text
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