92 results on '"Nair SM"'
Search Results
2. Plasmonic gold nanostars for synergistic photoimmunotherapy to treat cancer
- Author
-
Liu Yang, Chorniak Ericka, Odion Ren, Etienne Wiguins, Nair Smita K., Maccarini Paolo, Palmer Gregory M., Inman Brant A., and Vo-Dinh Tuan
- Subjects
cancer ,gold nanostars ,photoimmunotherapy ,Physics ,QC1-999 - Abstract
Cancer is the second leading cause of death and there is an urgent need to improve cancer management. We have developed an innovative cancer therapy named Synergistic Immuno Photothermal Nanotherapy (SYMPHONY) by combining gold nanostars (GNS)-mediated photothermal ablation with checkpoint inhibitor immunotherapy. Our previous studies have demonstrated that SYMPHONY photoimmunotherapy not only treats the primary tumor but also dramatically amplifies anticancer immune responses in synergy with checkpoint blockade immunotherapy to treat remote and unresectable cancer metastasis. The SYMPHONY treatment also induces a ‘cancer vaccine’ effect leading to immunologic memory and prevents cancer recurrence in murine animal models. This manuscript provides an overview of our research activities on the SYMPHONY therapy with plasmonic GNS for cancer treatment.
- Published
- 2021
- Full Text
- View/download PDF
3. Adjuvant therapeutic use of supercritical-ethanol extracts of Curcuma species with cancer drugs in rhabdomycosarcoma cell lines
- Author
-
Ramachandran, C, primary, Nair, SM, additional, Quirrin, KW, additional, Escalon, EA, additional, and Melnick, SJ, additional
- Published
- 2012
- Full Text
- View/download PDF
4. Pharmacokinetics, pharmacodynamics, safety, and efficacy of crizanlizumab in patients with sickle cell disease: final results from the phase II SOLACE-adults study.
- Author
-
Kanter J, Mennito S, Nair SM, Manwani D, Kutlar A, Shah N, Keefe D, Madhamshetty H, Nassin M, Reshetnyak E, Mendonza AE, and Liles D
- Abstract
Background: Crizanlizumab is a novel inhibitor of P-selectin, a key player in multicellular adhesion and inflammatory signaling, that leads to vaso-occlusion in sickle cell disease (SCD)., Objectives: The SOLACE-adults study evaluated the pharmacokinetics, pharmacodynamics (P-selectin inhibition), safety, and efficacy of crizanlizumab, with or without hydroxyurea/hydroxycarbamide, in patients with SCD., Design: Phase II, single-arm, multicenter study., Methods: Patients with SCD aged 16-70 years, with ⩾1 vaso-occlusive crisis (VOC) within 12 months before screening, received crizanlizumab 5.0 or 7.5 mg/kg intravenous infusion every 4 weeks; dose groups were enrolled sequentially., Results: Of 57 patients enrolled, 45 received crizanlizumab 5.0 mg/kg and 12 received 7.5 mg/kg for a median duration of 206 and 170 weeks, respectively. Crizanlizumab concentrations reached maximum levels after a 30-min infusion and remained steady for 6 h, without significant accumulation. P-selectin inhibition was nearly complete for both doses. The median (interquartile range) absolute change in the annualized rate of VOCs leading to healthcare visit from baseline was -0.79 (-3.04, 2.01) in the 5.0 mg/kg group and -0.98 (-1.11, -0.41) in the 7.5 mg/kg group. All patients experienced at least one adverse event (AE), with no apparent differences between the two doses in the frequency and severity of AEs. Grade ⩾3 AEs occurred in 60% of the 5.0 mg/kg group and 58% of the 7.5 mg/kg group. Two patients in the 5.0 mg/kg group and one in the 7.5 mg/kg group had severe crizanlizumab-related infusion-related reactions, which resolved with treatment. No patients developed antibodies against crizanlizumab., Conclusion: Crizanlizumab 5.0 and 7.5 mg/kg demonstrated a dose-proportional increase in exposure, sustained P-selectin inhibition, a tolerable safety profile, and a sustained reduction in VOCs leading to healthcare visit. This suggests that crizanlizumab is a useful treatment option for patients with SCD who have experienced VOCs., Trial Registration: NCT03264989., Competing Interests: J.K. reports receipt of research funding from NHLBI, BEAM, Bluebird Bio, CDC, HRSA, Novartis, Novo Nordisk, and Takeda; consultancy for Austin Pharmaceuticals, Bausch, BEAM, Bluebird Bio, ECOR-1, Fulcrum, Novartis, and Watkins, Lourie, Roll & Chance; membership on an entity’s Board of Directors or advisory committees with Austin Pharmaceuticals, Bluebird Bio, Ciesi, Glycomimetics, and Novartis; and honoraria from Guidepoint Global; D.M. reports consultancy from Editas, GBT, Novartis, Novo Nordisk, and Pfizer; A.K. reports receipt of research funding from Akira Bio, Forma/Novo-Nordisk, GBT/Pfizer, and Novartis; consultancy for Novartis; membership on an entity’s Board of Directors or advisory committees with Bluebird Bio, GBT/Pfizer, and Novartis; and event adjudication committee (EAC) Chair for Vertex; N.S. reports receipt of research funding from GBT/Pfizer; consultancy for Agios Pharmaceuticals, Bluebird Bio, Forma, GBT/Pfizer, and Vertex; and speaker bureau for Alexion Pharmaceuticals and GBT/Pfizer; D.L. reports clinical trial activity as principal investigator or sub-investigator for Annexon Biosciences Inc., Baxalta, BeiGene Ltd., Bioverativ Inc., Celgene, Delta, Exact Sciences, Janssen Research and Development, Immunovant Inc., Incyte Corp., Novartis, Partner Therapeutics, Principia Biopharma Inc., Sanofi-Aventis LLC, Takeda, and Vifor Pharma; D.K., M.N., and E.R. are employees of Novartis Pharmaceuticals Corporation, East Hanover, New Jersey, USA; H.M. is an employee of Novartis Healthcare Private Limited, Hyderabad, India; and A.E.M. is an employee of BioMedical Research, Cambridge, MA, USA; S.M. and S.M.N. have nothing to disclose., (© The Author(s), 2024.)
- Published
- 2024
- Full Text
- View/download PDF
5. Revealing the temporal dynamics of fish assemblage pattern, feeding guilds in relation to habitat quality parameters in a coastal wetland of the Indian Sundarban eco-region.
- Author
-
Chanu TN, Gogoi P, Koushlesh SK, Jana C, Nair SM, Das SK, Sinha A, Devi HM, and Das BK
- Abstract
The present study was conducted from April 2016 to March 2017 in a freshwater-dominated coastal wetland of the Indian Sundarban ecoregion to illustrate the fish diversity, and abundance and the predictor variables determining fish assemblage structure in the wetland. A total of 27 fish species belonging to 13 orders, 16 families, and 23 genera with Cyprinidae (18.5%) as the most dominant family were recorded from the wetland. Fish species richness was found to vary noticeably across the season with the highest number of taxa during the monsoon season (25 species). The study revealed that small indigenous fish species (SIFs) were found dominating the overall species richness and abundance which accounted for 70.37% of the total fish diversity. Among SIFs, Mystus gulio dominated (33 - 42%) the total fish abundance followed by Amblypharyngodon mola (12 - 21.7%), Oryzias dancena (11 - 14.9%), Parambassis ranga (6 - 32%), Puntius sophore (5 - 10.8%), and Parambassis lala (3 - 5.9%). Thirteen fish species were found as inhabitants of truly freshwater, eight species of freshwater and brackish water, and six of freshwater, brackish, and marine form. The developed GAM model proved water turbidity to be the best predictor variable determining fish abundance and assemblages in the wetlands. Besides, turbidity, salinity, transparency, and temperature were found to influence the fish assemblages. There was no visible response to water depth, although this has a linear effect on fish abundance. Water temperatures up to about 30.5 °C had a positive effect on fish abundance and the highest fish abundance in the wetland to be found in the range of 29 to 30.5 °C., (© 2024. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
- Published
- 2024
- Full Text
- View/download PDF
6. A review of metabolic and microbial influences on women with polycystic ovarian syndrome.
- Author
-
Ravat FK, Goswami JR, Nair SM, and Thummar KN
- Abstract
Introduction: Polycystic Ovary Syndrome (PCOS) is a prevalent endocrine and metabolic disorder affecting reproductive-aged women worldwide. Characterized by irregular menstruation, signs of hyperandrogenism, polycystic ovaries via ultrasound ovarian dysfunction., Area Covered: The review delves into the intricate pathophysiological mechanisms underlying the syndrome. Dysregulation of the hypothalamic-pituitary-ovarian axis, IR, obesity, and hyperandrogenism contribute to anovulation and follicular dysfunction which is associated with gut dysbiosis, bile metabolites, and an unhealthy diet. Metabolomics and genomics analyses offer insights into the metabolism of bile acids (BAs) and gut microbiota dysbiosis in PCOS. BAs, crucial for metabolic regulation, are influenced by microbes, impacting hormonal balance. Disruptions in gut microbiota contribute to hormonal dysregulation. Interconnected pathways involving BAs and gut microbiota are pivotal in PCOS. Therapeutic implications include a healthy diet, exercise, and interventions targeting gut microbiota modulation and BAs metabolite to alleviate PCOS symptoms and improve metabolic health., Conclusion: PCOS requires a multifaceted, multidisciplinary approach for effective management, including lifestyle changes, medications, and emerging therapies. Tailored strategies considering individual needs and personalized treatment plans are crucial for successful PCOS management. Despite existing knowledge, comprehensive investigations are needed to bridge research gaps and discern the interconnected pathways linking the development of PCOS and the gut-bile axis which are interconnected with metabolic disorders and the development of PCOS. Gut microbiota and hormonal regulation offer promising avenues for innovative therapeutic strategies aimed at addressing the root causes of PCOS and improving patient outcomes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Inc. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
7. Post-ictal changes presenting as late pseudoprogression on MRI and PET in a patient with diffuse glioma: Case report and brief literature review.
- Author
-
Nair SM, Sahu A, Dasgupta A, Puranik A, and Gupta T
- Subjects
- Humans, Magnetic Resonance Imaging methods, Positron-Emission Tomography methods, Tumor Microenvironment, Brain Neoplasms diagnostic imaging, Brain Neoplasms therapy, Brain Neoplasms pathology, Glioma diagnostic imaging, Glioma therapy, Glioma pathology, Oligodendroglioma diagnostic imaging, Oligodendroglioma therapy
- Abstract
Following completion of adjuvant radiation and chemotherapy imaging surveillance forms a major role in the management of diffuse gliomas. The primary role of imaging is to detect recurrences earlier than clinical symptomatology. Magnetic resonance imaging (MRI) is considered the gold standard in follow-up protocols owing to better soft tissue delineation and multiparametric nature. True recurrence can often mimic treatment-related changes, it is of paramount importance to differentiate between the two entities as the clinical course is divergent. Addition of functional sequences like perfusion, spectroscopy and metabolic imaging can provide further details into the microenvironment. In equivocal cases, a follow-up short interval imaging might be obtained to settle the diagnostic dilemma. Here, we present a patient with diagnosis of recurrent oligodendroglioma treated with adjuvant chemoradiation, presenting with seizures five years post-completion of chemotherapy for recurrence. On MRI, subtle new onset gyral thickening of the left frontal region with mild increase in perfusion and patchy areas of raised choline. FET-PET (fluoro-ethyltyrosine) showed an increased tumour-to-white matter (T/Wm) ratio favouring tumour recurrence. Based on discussion in a multi-disciplinary joint clinic, short interval follow-up MRI was undertaken at two months showing decrease in gyral thickening and resolution of enhancing areas in left frontal lobe. Repeat imaging one year later demonstrated stable disease status without further new imaging findings. Given the changes resolving completely without any anti-tumoral intervention, we conclude this to be peri-ictal pseudoprogression, being the second such case described in India., Competing Interests: Declaration of conflicting interestThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
- Published
- 2024
- Full Text
- View/download PDF
8. Opsarius siangi , a new Chedrinae fish species from the Brahmaputra drainage, India.
- Author
-
Kumari K, Borah S, Nair SM, and Suresh VR
- Abstract
Opsarius siangi sp. nov., a previously undocumented species, has been identified from Siang River, Pasighat, Arunachal Pradesh, India. This newly described species is distinguished by a suite of unique morphological characteristics, notably including a complete lateral line, consisting of 65-77 scales, 32-39 pre-dorsal scales, 12-15 scales positioned between dorsal fin origin and lateral line, presence of two pairs of barbels, body depth ranging from 18.80% to 27.42% of standard length and a distinct pattern of 8-15 vertical bars adorning the body. A comprehensive genetic analysis was conducted by scrutinizing 78 Cytochrome oxidase I (COI) sequences extracted from Chedrinae fishes, with particular focus on Opsarius and Barilius genera. Phylogenetic analysis revealed that O. siangi sp. nov. occupies a distinctive clade, displaying close affinity with O. shacra . Intraspecific K2P genetic divergence, assessed at 0.02, falls well within established species delineation thresholds, while interspecific divergence in comparison to O. shacra was recorded at 0.112. Complementary species delimitation methodologies, including BIN and bPTP, further underscore taxonomic uniqueness of O. siangi sp. nov., within Chedrinae family. This description enriches our understanding of biodiversity within Siang River ecosystem and underscores the merit of employing multi-pronged approaches in taxonomic investigations.
- Published
- 2024
9. Comparison of salvage radical prostatectomy vs. salvage ablation therapy for biopsy-proven radio-recurrent localized prostate cancer.
- Author
-
McPherson V, Nair SM, Tin AL, Dewar M, Siddiqui K, Sjoberg DD, Vickers AJ, Eastham J, and Chin JL
- Abstract
Introduction: Radiation therapy for prostate cancer is associated with a 15-20% five-year recurrence rate. Patients with recurrence in the prostate only are candidates for salvage local therapies; however, there is no consensus on modality. This study uses registries at Memorial Sloan Kettering Cancer Center (MSKCC) and University of Western Ontario (UWO) to compare the oncologic outcomes of salvage radical prostatectomy (SRP) and salvage ablation (SA)., Methods: A total of 444 patients were available for analysis. Due to intergroup differences, propensity score methodology was used and identified 378 patients with more comparable pre-salvage prostate-specific antigen (PSA), Gleason score, and primary radiation treatment. Patients underwent SRP at MSKCC and SA at UWO., Results: Of the 378 patients, 48 died of disease, with a 6.0-year median (interquartile range [IQR] 3.0, 9.7) followup among survivors; 88 developed metastases, with a median 4.6-year (IQR 2.3, 7.9) followup among metastasis-free survivors. There was a non-significantly higher rate of cancer-specific (hazard ratio [HR ] 1.02, 95% confidence interval [CI] 0.51, 2.06, p=0.9) and improved metastasis-free survival (HR 0.71, 95% CI 0.44, 1.13, p=0.15) among patients undergoing SA compared to patients undergoing SRP. There were 143 patients who received hormonal therapy, with higher rates of androgen deprivation therapy (ADT) in SA (HR 1.42, 95% CI 0.97, 2.08, p=0.068), although this did not meet conventional levels of significance., Conclusions: This propensity score analysis of salvage therapy for radio-recurrent prostate cancer identified no statistically significant differences in oncologic outcome between SRP and SA; however, there was evidence of a lower risk of ADT in the cohort undergoing SRP. Given they are both potentially curative therapies, these treatments are viable options for men with clinically localized, radio-recurrent prostate cancer rather than ADT alone. Future research may further elucidate subpopulations that may be more amenable to either SRP or SA.
- Published
- 2024
- Full Text
- View/download PDF
10. Reconnoitre on ichthyofauna of Mahanadi River of India: shifting diversity down the river continuum and linking ecological traits with patterns in biodiversity.
- Author
-
A M S, Nair SM, Sudheesan D, Samanta S, Paul SK, Bhowmick S, Kumar V, and Das BK
- Subjects
- Humans, Animals, Fresh Water, Fishes, India, Ecosystem, Rivers, Biodiversity
- Abstract
Anthropogenic alterations have paramount impacts on the alpha and beta diversity of aquatic resources, and fishes are predominantly susceptible to such impacts. Mahanadi River, one of the major peninsular rivers of India, has abundant fish resources, which play a significant role in supporting the fishers' livelihoods. The exploratory study in the river conducted for three consecutive years recorded 148 species under 53 families. Cyprinids dominated the fish diversity with 41 species, followed by Bagrids (9) and Sciaenids (7). One hundred-one species under 29 families were reported from the freshwater stretch. With a total of 111 species reported under 48 families, the estuarine and tidal freshwater stretch was more speciose, due to marine migrant species which advent the estuarine and tidal freshwaters stretch for breeding and feeding purposes. Tikarpara, a conserved site within a sanctuary, was the most species-diverse as well as a species-even site. The study also recorded the extension of the distributional range of 3 fish species and also 4 exotic species from the river. The seasonal variations in diversity indicated that the deviations were not prominent in freshwater sites, whereas in tidal brackish water sites, species richness was relatively higher in post-monsoon, and species evenness was higher during monsoon. Taxonomic distinctness test showed that the average taxonomic distinctness was high for tidal estuarine locations as they harbour taxonomically distant fishes. The hierarchical clustering of sites showed the inordinate effect of river gradient and fragmentation on the fish community structure. Analyzing the key drivers of the assemblage structure of the entire river, salinity was the major deterministic factor, and within the freshwater stretch, the major influences were depth, transparency, and specific conductivity. The study concluded that, despite all of its ecological stresses, Mahanadi still supports rich fish diversity, yet there is a notable shift in the fish community structure. There is a need for integrating molecular and morphological tools for the taxonomic revision of many genera and species for proper in situ and ex situ conservation measures and to formulate future biodiversity management plans addressing to reduce the impacts of the ecological threats., (© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2024
- Full Text
- View/download PDF
11. Unusual Extra-Axial and Extracranial Recurrence in an IDH Mutant Astrocytoma: A Case Report.
- Author
-
Nair SM, Sahu A, Prasad A, George AM, Goel A, and Gupta T
- Abstract
Isocitrate dehydrogenase mutant gliomas generally have a better prognosis than their wild-type counterpart. Recurrences are generally within the radiation field in the primary tumoral bed. Remote recurrence is uncommon and is usually intraparenchymal. Transformation to a higher grade has been observed with TP53 mutants. Presentation of glioma as an extra-axial lesion is extremely uncommon. No such cases of remote intracranial extra-axial recurrence have been reported in the literature. We describe the unique imaging findings in this case and attempt to formulate possible diagnoses. Intraoperative and pathological findings confirmed this unusual recurrence pattern., Competing Interests: Conflict of Interest None declared., (Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. ( https://creativecommons.org/licenses/by-nc-nd/4.0/ ).)
- Published
- 2023
- Full Text
- View/download PDF
12. Probing river health status: a study based on index of biotic integrity (IBI) in Tapti River of Deccan plateau, India.
- Author
-
Nair SM, Muhammadali SA, Koushlesh SK, Chanu TN, Das SK, Bhakta D, Pillai VG, Gogoi P, Samanta S, Meetei WA, Baitha R, Kamble SP, Kumar V, and Das BK
- Subjects
- Animals, Rivers, Fishes, Health Status, India, Environmental Monitoring methods, Ecosystem
- Abstract
Anthropogenic activities impacted the ecological health of rivers by altering the physical habitat and water flow as well as by pollution. Monitoring of biotic groups for gauging the river health is a prerequisite for assessing the extent of degradation and formulating management guidelines for river restoration. An assessment using fish-based index of biotic integrity (IBI) was carried out in the Central Indian river, Tapti, for probing its health status. For the multimetric index, twelve metrics were adopted under five categories: taxonomic richness, habitat composition, tolerance indicators, species resilience, and trophic composition. Among the studied sites, Betul in the upper stretch was selected as the reference site for River Tapti, which almost meets the upper expectation of the metrics explored. Continuous scoring method was applied to evaluate the biotic integrity in the selected sites of the river. The IBI score based on the pooled fish abundance data in River Tapti ranged from 33 to 60. Assessment of the ecological health revealed that three-fourth of the river stretch was moderately impaired (25-50% of impairment) and the most deteriorated site was Kamrej with 45% of impairment which might be due to its location in the urban area with high influx of domestic sewage and industrial effluents. The IBI scores were plotted and compared with an independent estimate of water quality. The CCA with environmental and IBI variables revealed higher correlation with each other and the functional groups such as carnivores, herbivores, and fishes with high population doubling time (PDT) were found in close association with nitrate-N, total alkalinity, and specific conductivity. The study urges the need for the adoption of proper management and mitigation measures to restore the health and wealth of aquatic ecosystem., (© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2023
- Full Text
- View/download PDF
13. Pharmacokinetics, pharmacodynamics, safety, and efficacy of crizanlizumab in patients with sickle cell disease.
- Author
-
Kanter J, Brown RC, Norris C, Nair SM, Kutlar A, Manwani D, Shah N, Tanaka C, Bodla S, Sanchez-Olle G, Albers U, and Liles D
- Subjects
- Humans, Pain drug therapy, Selectins, Antibodies, Monoclonal, Humanized adverse effects, Anemia, Sickle Cell drug therapy
- Abstract
Crizanlizumab is an anti-P-selectin monoclonal antibody indicated to reduce the frequency/prevent recurrence of vaso-occlusive crises (VOCs) in patients with sickle cell disease (SCD) aged ≥16 years. This analysis of an ongoing phase 2, nonrandomized, open-label study reports the pharmacokinetics (PK), pharmacodynamics (PD), safety, and efficacy of crizanlizumab 5.0 mg/kg (N = 45) and 7.5 mg/kg (N = 12) in patients with SCD with a history of VOCs. The median treatment duration was 104.7 and 85.7 weeks in the 5.0 and 7.5 mg/kg groups, respectively. For both doses, serum crizanlizumab concentrations rose to near maximum levels shortly after infusion, and near complete and sustained ex vivo P-selectin inhibition was observed. Grade ≥3 adverse events (AEs) occurred in 48.9% and 33.3% of patients in the 5.0 and 7.5 mg/kg groups, respectively; only 1 event was deemed treatment-related (7.5 mg/kg group). No treatment-related serious AEs occurred. One infusion-related reaction was recorded (5.0 mg/kg, grade 2 "pain during infusion"), which resolved without treatment withdrawal. Infections occurred in 57.8% and 41.7% of patients in the 5.0 and 7.5 mg/kg groups, respectively; none were drug-related. No treatment-related bleeding events were reported. No patients developed immunogenicity. The median (range) absolute reduction from baseline in the annualized rate of VOCs leading to a health care visit was -0.88 (-14.7 to 13.3) and -0.93 (-2.0 to 0.4) in the 5.0 and 7.5 mg/kg groups, respectively. Results here demonstrate the PK/PD properties of crizanlizumab in patients with SCD and the potential sustained efficacy and long-term safety of the drug after >12 months' treatment. This trial was registered at www.clinicaltrials.gov as #NCT03264989., (© 2023 by The American Society of Hematology. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0), permitting only noncommercial, nonderivative use with attribution. All other rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
14. Teachers' Participation in Decision-Making, Professional Growth, Appraisal, and Behavioral Intentions in the Promotion System Reform in Chinese Universities.
- Author
-
Peng W and Nair SM
- Abstract
The promotion system in Chinese universities has been undergoing a reform since 2017. This study employed an online survey validated by confirmatory factor analysis with 372 Chinese teachers to investigate the extent to which they were empowered by the two practices of participation in decision-making and professional growth in the reform and level of their appraisal of and behavioral intentions toward the new promotion system. Structural equation modeling was used to measure how the two empowerment practices influenced the teachers' appraisal of and behavioral intentions toward the new system. The findings suggest that the Chinese teachers had low participation in decision-making and medium institutional support for professional growth, relatively low nonmonetary cost-benefit appraisal and medium practicality and fairness appraisal of the new system, and relatively high behavioral intentions to increase efforts according to the new system. Besides, participation in decision-making had a significantly direct effect on practicality and nonmonetary cost-benefit appraisal. Professional growth had a significantly direct effect on practicality, fairness, and nonmonetary cost-benefit appraisal and behavioral intentions. Nonmonetary cost-benefit appraisal had a significantly direct effect on behavioral intentions. The implications are that, in promotion system reforms, the two empowerment strategies of shared decision-making and professional growth can help establish a new promotion system with high nonmonetary cost-benefits for teachers and raise teachers' behavioral intentions to develop and pursue promotion. They can also contribute to the formulation of a new promotion system that effectively evaluates individual teacher's achievements according to the characteristics of the specific university, teacher type, and discipline. This study had the limitations of using convenience sampling, collecting cross-sectional data through self-administered questionnaires, and reporting only teachers' side of the story. Therefore, it is recommended that future studies target both teachers and administrators, employ a mixed-method design, collect quantitative data through random sampling, and take a longitudinal view., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Peng and Nair.)
- Published
- 2022
- Full Text
- View/download PDF
15. The Interactive Relationship Between Instructor Perceptions and Learner Personality on Surgical Skills Performance.
- Author
-
Wang PZT, Wilson CA, Nair SM, Bjazevic J, Dave S, Davidson J, Saklofske DH, and Chahine S
- Subjects
- Humans, Prospective Studies, Students, Interpersonal Relations, Personality
- Abstract
Objective: The objective of this study was to examine the association between learner personality and capacity to be trained (i.e., performance improvement) on a surgical task, and how instructor perceptions of the learners' capacity to be trained interact with learner personality and performance during training and feedback. There is meaningful heterogeneity in the degree of learner surgical skills acquisition despite receiving the same amount of training. While learner personality may independently contribute to skill acquisition, the instructor-learner feedback process is also important to consider. To better understand this interpersonal relationship, it is necessary to also consider instructor factors (i.e., perceptions), and how this may contribute to learner variability in skills training., Design: This exploratory study employed a prospective two-phase design. Medical and non-medical undergraduate students (N = 62) completed measures of personality and participated in two 20-minute training sessions with expert feedback 2 weeks apart, performing an end-to-side anastomosis on a low-fidelity model. Learner performance and instructors' perceptions of a learner's capacity to be trained were assessed., Participants: Sixty-two medical and non-medical undergraduate students., Results: There was a significant interaction between learner Extraversion and instructor's perceptions of learner capacity to be trained. Higher learner Extraversion was only associated with an increase in performance improvement for those who were considered trainable (OR = 4.83, p = 0.017). Post hoc analysis revealed a significant difference in the amount of feedback provided to participants who were considered trainable (M = 9.45) versus not trainable (M = 16.48)., Conclusions: This study highlights the importance of both individual learner factors and instructor perceptions on surgical skill acquisition., Competing Interests: Declarations of interest None., (Copyright © 2022 Association of Program Directors in Surgery. Published by Elsevier Inc. All rights reserved.)
- Published
- 2022
- Full Text
- View/download PDF
16. The identity and distribution of striped bagrid catfish, Mystus tengara (Hamilton 1822) revealed through integrative taxonomy.
- Author
-
Nair SM, Kumari K, Kumar AP, Raghavan R, and Jaiswar AK
- Subjects
- Animals, Bangladesh, Bayes Theorem, Catfishes genetics, Fish Proteins genetics, India, Likelihood Functions, Mitochondrial Proteins genetics, Nepal, Phylogeny, Phylogeography, Catfishes anatomy & histology, Catfishes classification, Electron Transport Complex IV genetics
- Abstract
Background: The taxonomic status and geographical distribution of M. tengara are vague. No genetic diversity and phylogenetic study have been done till now to resolve its identity and distribution. In the present study, an integrated taxonomic approach has been applied to clarify the taxonomic status, identity, and distribution of bagrid catfish, Mystus tengara., Methods and Results: Comparative morphometric evaluation of M. tengara identified in the present study from distant geographical locations revealed variations of the traits in response to body length and environment, without significant genetic distance. The observed morphometric traits of M. tengara were found to be overlapping with available morphometric traits of M. tengara, M. carcio and M. vittatus. Maximum likelihood and Bayesian phylogenetic analysis based on mitochondrial cytochrome c oxidase (COI) gene also could not resolve their identity, and five paraphyletic clades comprising of M. tengara, M. vittatus, and M. carcio from India, Nepal, and Bangladesh were observed. Morphological and genetic evidence along with comparative evaluation of M. tengara, from its type locality, we consider M. tengara identified in the present study to be true, with its distribution extending from North East India to West Bengal, North India, Central India, Northern peninsular India, and Bangladesh., Conclusion: The observation of paraphyletic subclades and evaluation of genetic distance between subclades reveals the presence of four cryptic species. Further confirmation on the identity of M. vittatus and M. carcio, by an integrated taxonomic approach based on fresh specimens collected from the type locality, is required., (© 2021. The Author(s), under exclusive licence to Springer Nature B.V.)
- Published
- 2022
- Full Text
- View/download PDF
17. A Population Health Approach to Address the Burden of Congenital Heart Disease in Kerala, India.
- Author
-
Nair SM, Zheleva B, Dobrzycka A, Hesslein P, Sadanandan R, and Kumar RK
- Subjects
- Child, Health Promotion, Humans, India epidemiology, Infant, Infant Mortality, Retrospective Studies, Heart Defects, Congenital epidemiology, Heart Defects, Congenital therapy, Population Health
- Abstract
Background: Congenital heart disease (CHD) has emerged as a leading contributor to infant mortality in many low-and middle-income countries (LMICs). We report early results of a population health program for CHD, implemented in the state of Kerala, India., Objective: Report on early results of a population-based program implementation in a LMIC to reduce mortality from CHD., Methods: We retrospectively analyzed the results of an innovative population-based program to address CHD. We devised, implemented and evaluated measures in the care continuum to address deficiencies in CHD care in Kerala, India, through structured capacity building initiatives that enabled early detection, prompt stabilization and expedited referral to a tertiary center. A comprehensive web-based application enabled real-time case registration, prioritization of treatment referrals, and tracking every child registered with CHD. Advanced pediatric heart care was delivered through a public-private partnership., Results: Early identification, referral, and treatment of infants with CHD were improved. The web-based application, ' Hridyam ,' registered 502 cases in 2017 (Aug-Dec), 2190 in 2018 and 3259 in 2019; infants < 1 year of age constituted 56, 62 and 63% in these years, respectively. The number of heart operations managed through Hridyam rose from 208 to 624 and 1227 in the same years, with overall 30-day mortality of 2.4%. Overall- and CHD-related infant mortality in Kerala fell by 21.1% and 41.0%, respectively, over the same interval. Unmet challenges include lack of universal catchment and a 5% preoperative mortality rate., Conclusion: We demonstrate successful implementation of a population-based and real-time approach to reduce CHD mortality. We speculate that Hridyam has contributed to the observed decline in Kerala's IMR from 12 to 7 between 2016 and 2019. This model has potential applications for other conditions, and in other jurisdictions, especially LMICs considering building CHD capacity., Competing Interests: The authors have no competing interests to declare., (Copyright: © 2021 The Author(s).)
- Published
- 2021
- Full Text
- View/download PDF
18. Comparison of performance characteristics of C-MAC video, McCoy, and Macintosh laryngoscopes in elective cervical spine surgery.
- Author
-
Nair SM, Menon GD, George M, Issac E, and Bhaskaran R
- Abstract
Background and Aims: To compare the performance characteristics of C-MAC video, McCoy, and Macintosh laryngoscopes in elective cervical spine surgery. The primary objective was to assess the ease of intubation with the three study devices. The secondary objectives were the time to intubation and hemodynamic responses during intubation., Material and Methods: The prospective observational comparative study was conducted in a tertiary care hospital. Adult ASA 1 and 11 patients who underwent elective cervical spine surgery were included in the study. Patients with unstable spine and trauma were excluded. The analysis of variance, Bonferroni test, Chi square test and multiple comparison tests were used to compare the performance characteristics of laryngoscopes., Results: The C-MAC video laryngoscope improved glottis view by improving the modified Cormack-Lehane (CL) score and the percentage of glottis opening (POGO) score compared to McCoy and Macintosh laryngoscopes. The ease of intubation was better with the C-MAC video laryngoscope compared to the McCoy and Macintosh laryngoscopes. The time to intubation was comparable between the three laryngoscopes. The C-MAC video and McCoy laryngoscopes had 100% successful first attempt intubations while it was 90% for the Macintosh laryngoscope. Hemodynamic variables observed during intubation were comparable between the three groups., Conclusion: The use of C-MAC video laryngoscope resulted in better visualization of the glottis and easier tracheal intubation as compared to the Macintosh and McCoy laryngoscopes in cervical spine surgery. Both C-MAC video and McCoy laryngoscopes had 100% successful first attempt intubation., Competing Interests: There are no conflicts of interest., (Copyright: © 2022 Journal of Anaesthesiology Clinical Pharmacology.)
- Published
- 2021
- Full Text
- View/download PDF
19. Long-Term Outcomes of Whole Gland Salvage Cryotherapy for Locally Recurrent Prostate Cancer following Radiation Therapy: A Combined Analysis of Two Centers.
- Author
-
Chin JL, Lavi A, Metcalfe MJ, Siddiqui K, Dewar M, Petros FG, Li R, Nogueras González GM, Wang X, Nair SM, Ward JF, and Pisters L
- Subjects
- Aged, Androgen Antagonists pharmacology, Androgen Antagonists therapeutic use, Chemotherapy, Adjuvant statistics & numerical data, Follow-Up Studies, Humans, Kallikreins blood, Male, Neoadjuvant Therapy statistics & numerical data, Neoplasm Recurrence, Local blood, Neoplasm Recurrence, Local diagnosis, Neoplasm Recurrence, Local mortality, Postoperative Complications etiology, Prospective Studies, Prostate pathology, Prostate radiation effects, Prostate surgery, Prostate-Specific Antigen blood, Prostatic Neoplasms, Castration-Resistant blood, Prostatic Neoplasms, Castration-Resistant diagnosis, Prostatic Neoplasms, Castration-Resistant mortality, Radiation Tolerance, Radiotherapy, Adjuvant statistics & numerical data, Retrospective Studies, Salvage Therapy methods, Survival Rate, Treatment Outcome, Cryosurgery adverse effects, Neoadjuvant Therapy methods, Neoplasm Recurrence, Local therapy, Postoperative Complications epidemiology, Prostatic Neoplasms, Castration-Resistant therapy, Salvage Therapy adverse effects
- Abstract
Purpose: Radiation refractory prostate cancer (RRPCa) is common and salvage cryotherapy for RRPCa is emerging as a viable local treatment option. However, there is a paucity of long-term data. The purpose of this study is to determine long-term outcomes following salvage cryotherapy for RRPca., Materials and Methods: Patients undergoing salvage cryotherapy for biopsy-proven, localized RRPCa from 1992 through 2004 were prospectively accrued at two centers. Preoperative characteristics, perioperative morbidity and postoperative data were reviewed from our database. The primary outcomes were overall survival (OS) and disease-specific survival (DSS). The secondary outcomes were freedom from castration-resistant prostate cancer (CRPC) and freedom from androgen deprivation therapy (ADT)., Results: A total of 268 patients were identified with a median followup of 10.3 years. A total of 223 complication events were recorded; of them, 168 were Clavien I-II events and 55 Clavien III events. At 10 years, 69% had freedom from ADT and 76% had freedom from CRPC. The 10-year DSS rate was 81%, and the 10-year OS rate was 77%. A pre-salvage prostate specific antigen level of >10 ng/ml was associated with an increased risk of developing CRPC and initiation of ADT but was not associated with DSS or OS. The use of neoadjuvant ADT was associated with improved OS and DSS but did not affect freedom from CRPC or adjuvant ADT., Conclusions: Salvage cryotherapy for RRPCa provides excellent long-term freedom from ADT, CRPC and DSS with acceptable morbidity. OS at 10 years was 77%. Prospective trials are required for validation.
- Published
- 2021
- Full Text
- View/download PDF
20. Longitudinal experience with Studer neobladders: Outcomes and complications.
- Author
-
Chan EP, Nair SM, Hetou K, Stephenson E, Power NE, Izawa J, and Chin JLK
- Abstract
Introduction: This study aims to assess the longer-term functional, anatomical, and metabolic outcomes of patients who underwent Studer neobladder (SNB) urinary diversion., Methods: A retrospective review of patients who underwent SNB at a single center from 1995-2017 (n=116) was performed. Demographics, comorbidities, pathological data, and longer-term functional, anatomical, and metabolic outcomes were collected from hospital records. The primary outcome was voiding function of patients at most recent followup. Secondary outcomes included postoperative complications, renal function, nephrolithiasis, infections, and metabolic outcomes., Results: Excluding those with incomplete followup data, 72 patients with a minimum followup of one year were included for analysis. Median followup was 70±11 months, with 52.8% of patients having ≥5 years of followup. Clean intermittent catheterization (CIC) was used by 22.2% of patient at most recent followup, which was mostly necessitated by bladder overdistension, deteriorating renal function, or recurrent urosepsis despite timed voiding. Patients experienced more daytime and nighttime urinary incontinence in the early postoperative setting, which improved over time. Generally, renal function declined over time; poorer long-term renal function was predicted by hydronephrosis within one year (p=0.002)., Conclusions: Longer-term followup of SNB reveals significant but manageable complications. Gradual decline in renal function was common. Strict adherence to bladder emptying protocols (e.g., timed voiding or CIC) may reduce incidence of renal deterioration, metabolic disorders, and urinary dysfunction. Early onset (<1 year) of hydronephrosis may indicate a need for intervention to preserve long-term renal function.
- Published
- 2021
- Full Text
- View/download PDF
21. A Randomized Controlled Trial of a Modified Cystoscopy Technique using the Peak-End Rule in order to Improve Pain and Anxiety.
- Author
-
Hetou K, Halstuch D, Lavi A, Nair SM, Gan AML, Huynh MJ, Izawa J, Chin JL, and Power NE
- Subjects
- Adult, Aged, Female, Humans, Male, Middle Aged, Prospective Studies, Single-Blind Method, Anxiety prevention & control, Cystoscopy methods, Pain, Procedural prevention & control
- Abstract
Objective: To determine if a modified cystoscopy technique utilizing the peak-end rule cognitive bias decreases pain and anxiety during flexible cystoscopy in patients who undergo cystoscopy., Methods: A total of 85 participants undergoing their first diagnostic cystoscopy were enrolled in a blinded single-center, prospective, randomized controlled trial. Patients with lower urinary tract abnormalities, prior radiation and chronic pelvic pain were excluded. Participants were randomized to a standard cystoscopy (arm A) or a modified cystoscopy (arm B) where a two-minute period at the end of the procedure was completed during which the cystoscope was left in the bladder without being manipulated. Following the cystoscopy, participants completed a standard pain and anxiety questionnaire. Differences in mean pain and anxiety score between arms were evaluated using a Mann-Whitney test with a two-sided alpha of 0.05., Results: Eighty-five patients were randomized and underwent flexible cystoscopy. Three participants were ineligible, one required secondary procedures, and two did not complete the questionnaires. Among the 82 eligible patients, 45 were randomized to standard cystoscopy (arm A) and 37 to the modified cystoscopy (arm B) with mean pain scores of 23.20 and 11.97, respectively (P = .039). Mean anxiety scores were 2.09 and 0.88 for arm A and B, respectively (P = .013)., Conclusion: This study demonstrated a clinically meaningful decrease in pain and anxiety for patients undergoing flexible cystoscopy when employing the modified cystoscopy technique versus the standard practice. This free and straightforward method to improve patient comfort and decrease stress during first time flexible cystoscopy should be considered by clinicians., (Copyright © 2021 Elsevier Inc. All rights reserved.)
- Published
- 2021
- Full Text
- View/download PDF
22. Magnetic resonance imaging-guided transurethral ultrasound ablation in patients with localised prostate cancer: 3-year outcomes of a prospective Phase I study.
- Author
-
Nair SM, Hatiboglu G, Relle J, Hetou K, Hafron J, Harle C, Kassam Z, Staruch R, Burtnyk M, Bonekamp D, Schlemmer HP, Roethke MC, Mueller-Wolf M, Pahernik S, and Chin JL
- Subjects
- Aged, Biopsy, Large-Core Needle, Erectile Dysfunction etiology, Follow-Up Studies, Humans, Male, Minimally Invasive Surgical Procedures adverse effects, Neoplasm Recurrence, Local pathology, Penile Erection, Postoperative Complications etiology, Prostate-Specific Antigen blood, Prostatic Neoplasms blood, Prostatic Neoplasms pathology, Quality of Life, Recovery of Function, Salvage Therapy, Surgery, Computer-Assisted adverse effects, Urethra, Urinary Retention etiology, High-Intensity Focused Ultrasound Ablation adverse effects, Neoplasm Recurrence, Local diagnosis, Prostatic Neoplasms surgery
- Abstract
Objectives: To report the 3-year follow-up of a Phase I study of magnetic resonance imaging (MRI)-guided transurethral ultrasound ablation (TULSA) in 30 men with localised prostate cancer. Favourable 12-month safety and ablation precision were previously described., Patients and Methods: As a mandated safety criterion, TULSA was delivered as near whole-gland ablation, applying 3-mm margins sparing 10% of peripheral prostate tissue in 30 men. After 12-month biopsy and MRI, biannual follow-up included prostate-specific antigen (PSA), adverse events (AEs), and functional quality-of-life assessment, with repeat systematic biopsy at 3 years., Results: A 3-year follow-up was completed by 22 patients. Between 1 and 3 years, there were no new serious or severe AEs. Urinary and bowel function remained stable. Erectile function recovered by 1 year and was stable at 3 years. The PSA level decreased 95% to a median (interquartile range) nadir of 0.33 (0.1-0.4) ng/mL, stable to 0.8 (0.4-1.6) ng/mL at 3 years. Serial biopsies identified clinically significant disease in 10/29 men (34%) and any cancer in 17/29 (59%). By 3 years, seven men had recurrence (four histological, three biochemical) and had undergone salvage therapy without complications (including six prostatectomies). At 3 years, three of 22 men refused biopsy, and two of the 22 (9%) had clinically significant disease (one new, one persistent). Predictors of salvage therapy requirement included less extensive ablation coverage and higher PSA nadir., Conclusion: With 3-year Phase I follow-up, TULSA demonstrates safe and precise ablation for men with localised prostate cancer, providing predictable PSA and biopsy outcomes, without affecting functional abilities or precluding salvage therapy., (© 2020 The Authors BJU International © 2020 BJU International Published by John Wiley & Sons Ltd.)
- Published
- 2021
- Full Text
- View/download PDF
23. Does adding local salvage ablation therapy provide survival advantage for patients with locally recurrent prostate cancer following radiotherapy? Whole gland salvage ablation post-radiation failure in prostate cancer.
- Author
-
Nair SM, Warner A, Lavi A, Rodrigues G, and Chin JL
- Abstract
Introduction: Some men who experience prostate cancer recurrence post-radiotherapy may be candidates for local salvage therapy, avoiding and delaying systemic treatments. Our aim was to assess the impact of clinical outcomes of adding salvage local treatment in prostate cancer patients who have failed radiation therapy., Methods: Following radiation biochemical failure, salvage transperineal cryotherapy (sCT, n=186), transrectal high intensity focused ultrasound ablation (sHIFU, n=113), or no salvage treatment (NST, identified from the pan-Canadian Prostate Cancer Risk Stratification [ProCaRS] database, n=982) were compared with propensity-score matching. Primary endpoints were cancer-specific survival (CSS) and overall survival (OS)., Results: Median followup was 11.6, 25.1, and 14.3 years following NST, sCT, and sHIFU, respectively. Two propensity score-matched analyses were performed: 1) 196 NST vs. 98 sCT; and 2) 177 NST vs. 59 sHIFU. In the first comparison, there were 78 deaths and 49 prostate cancer deaths for NST vs. 80 deaths and 24 prostate cancer deaths for sCT. There were significant benefits in CSS (p<0.001) and OS (p<0.001) favoring sCT. In the second comparison, there were 52 deaths (31 from prostate cancer) for NST vs. 18 deaths (nine from prostate cancer) for sHIFU. There were no significant differences in CSS or OS possibility attributed to reduced sample size and shorter followup of sHIFU cohort., Conclusions: In select men with recurrent prostate cancer post-radiation, further local treatment may lead to benefits in CSS. These hypothesis-generating findings should ideally be validated in a prospective clinical trial setting.
- Published
- 2021
- Full Text
- View/download PDF
24. Long-term outcomes of two ablation techniques for treatment of radio-recurrent prostate cancer.
- Author
-
Nair SM, Peters M, Kurver P, Lavi A, Verhoeff JJC, van der Voort van Zyp JRN, van Son MJ, and Chin JL
- Subjects
- Aged, Androgen Antagonists therapeutic use, Biomarkers, Tumor blood, Cryotherapy methods, Disease Progression, Follow-Up Studies, High-Intensity Focused Ultrasound Ablation methods, Humans, Male, Neoplasm Recurrence, Local blood, Neoplasm Recurrence, Local diagnosis, Prostate-Specific Antigen blood, Prostatic Neoplasms blood, Prostatic Neoplasms diagnosis, Radiotherapy, Adjuvant adverse effects, Retrospective Studies, Time Factors, Ablation Techniques methods, Neoplasm Recurrence, Local therapy, Prostatic Neoplasms therapy, Salvage Therapy methods
- Abstract
Background: In men with recurrence of prostate cancer post radiation therapy, further treatment remains a challenge. The default salvage option of androgen-deprivation therapy (ADT) has adverse effects. Alternatively, selected men may be offered salvage therapy to the prostate. Herein, we present long-term oncological outcomes of two whole-gland ablation techniques, cryotherapy (sCT) and high-intensity-focused ultrasound (sHIFU)., Methods: Men undergoing sCT (1995-2004) and sHIFU (2006-2018) at Western University were identified. Oncological endpoints included biochemical recurrence (BCR), ADT initiation, metastases, castration resistance (CRPC), and prostate cancer-specific mortality (PCSM). Survival analysis with competing risks of mortality was performed. Multivariable analysis was performed using Fine and Gray regression., Results: A total of 187 men underwent sCT and 113 sHIFU. Mean (SD) age of the entire cohort was 69.9 (5.9 years), median pre-radiation PSA 9.6 ng/ml (IQR 6.1-15.2), and pre-salvage PSA 4.5 ng/ml (IQR 2.8-7.0). Median total follow-up was 116 months (IQR 67.5-173.8). A total of 170 (57.6%) developed BCR, 68 (23.4%) metastases, 143 (49.3%) were started on ADT, 58 (20.1%) developed CRPC, and 162 (56%) patients died of which 59 (36.4%) were of prostate cancer. On multivariable analysis, sHIFU (HR 1.65, 95% CI 1.15-2.36, p = 0.006) and pre-salvage PSA (HR 1.09, 95% CI 1.06-1.13, p < 0.0001) were associated with a higher risk of BCR. Similarly, sHIFU patients had a higher risk of CRPC (HR 2.31, 95% CI 1.23-4.35, p = 0.009). The cumulative incidence (for both treatments) of PCSM was 16.5% (95% CI 12.2-21.4%) at 10 years and 28.4% (95% CI 22.1-34.9%) at 20 years, with no difference between treatment modalities. Pre-salvage PSA was a common predictor for the measured oncological outcomes., Conclusions: Although sHIFU had higher BCR and CRPC rates, there were no differences in PCSM when compared with sCT. The long-term oncological data on two ablation techniques highlighted that only 50% of patients started ADT after 10-year follow-up.
- Published
- 2021
- Full Text
- View/download PDF
25. A severe complication of intravesical bacillus Calmette-Guerin: An effect of different strains.
- Author
-
Low LS, Scholtz D, Leyland J, and Nair SM
- Abstract
The use of intravesical BCG has improved the survival and outcomes in the treatment of bladder cancer. However, the worldwide shortage of OncoTice BCG has caused disruption and changes in treatment regimes, leading to use of alternative strains. We describe a severe complication as the result of using intravesical SII Onco BCG for the treatment bladder cancer, in an 82 year old man presenting with granulomatous epididymo-orchitis., Competing Interests: The authors report no conflict of interests., (© 2021 The Author(s).)
- Published
- 2021
- Full Text
- View/download PDF
26. Prostatic dystrophic calcification following salvage cryotherapy for prostate cancer - an under-reported entity?
- Author
-
Lavi A, Nair SM, Halstuch D, and Chin JL
- Subjects
- Aged, Follow-Up Studies, Humans, Male, Middle Aged, Salvage Therapy, Calcinosis complications, Calcinosis etiology, Cryosurgery adverse effects, Postoperative Complications etiology, Prostatic Diseases complications, Prostatic Diseases etiology, Prostatic Neoplasms surgery, Urinary Bladder Neck Obstruction etiology
- Abstract
Background: Salvage cryoablation (SCA) is an accepted treatment for radio-recurrent prostate cancer with well-established oncological and functional outcomes. Based on one of the longest reported prospective follow-ups in the literature (median 12 years) on 187 patients, this study reports what appears to be an under-appreciated finding in eight patients with dystrophic calcifications (DC) of the prostate following SCA, causing severe bladder outlet obstruction., Materials and Methods: Between 1995 and 2004, 187 patients underwent SCA, with a median follow-up of 12 years. This database was reviewed for functional and oncological outcomes and DC were evaluated., Results: Functional data was available in 85 patients, amongst whom eight patients were found to develop DC (9.4%) proven when the patients presented with urinary difficulties and attempted transurethral resection was undertaken for bladder outlet obstruction. Mean time for emergence of significant symptoms of bladder outlet obstruction was 8.6 years from SCA (standard deviation (SD) = 6 years). All eightpatients required permanent drainage (seven suprapubic catheters, one nephrostomy). All patients with DC experienced biochemical recurrence (BCR), compared to 57.1% of the patients with no DC ( p = 0.01)., Conclusion: DC following SCA appears to be an under-reported late adverse effect which may only become evident with long follow-up, and should be included in preoperative counselling.
- Published
- 2021
- Full Text
- View/download PDF
27. Author Correction: Abiraterone acetate preferentially enriches for the gut commensal Akkermansia muciniphila in castrate-resistant prostate cancer patients.
- Author
-
Daisley BA, Chanyi RM, Abdur-Rashid K, Al KF, Gibbons S, Chmiel JA, Wilcox H, Reid G, Anderson A, Dewar M, Nair SM, Chin J, and Burton JP
- Published
- 2020
- Full Text
- View/download PDF
28. Primary Mediastinal Germ Cell Tumors-The University of Western Ontario Experience.
- Author
-
Lavi A, Winquist E, Nair SM, Chin JL, Izawa J, Fernandes R, Ernst S, and Power NE
- Subjects
- Humans, Male, Ontario epidemiology, Mediastinal Neoplasms diagnosis, Mediastinal Neoplasms drug therapy, Neoplasms, Germ Cell and Embryonal diagnosis, Neoplasms, Germ Cell and Embryonal drug therapy, Seminoma, Testicular Neoplasms diagnosis, Testicular Neoplasms drug therapy
- Abstract
Extragonadal germ cell tumors account for 2-5.7% of germ cell tumors (GCTs). Of these, primary mediastinal GCTs (PMGCTs) are responsible for 16-36% of cases. Given the rarity of these tumors, specific treatment strategies have not been well defined. We report our experience in treating these complex patients. In total, 318 men treated at our institution with chemotherapy for GCTs between 1980 and 2016 were reviewed. PMGCT was defined as clinically diagnosed mediastinal GCT with no evidence of testicular GCT (physical exam/ultrasound). We identified nine patients diagnosed with PMGCT. All patients presented with an anterior mediastinal mass and no gonadal lesion; four patients also had metastatic disease. Median age at diagnosis was 30 years (range, 14-56) and median mass size at diagnosis was 9 cm (range, 3.4-19). Eight patients had non-seminoma and one had pure seminoma. All patients received cisplatin-based chemotherapy initially. Surgical resection was performed in four patients; three patients had a complete resection and one patient was found to have an unresectable tumor. At a median follow-up of 2 years (range, 3 months-28 years) six patients had progressed. Progression-free survival was short with a median of 4.1 months from diagnosis (range 1.5-122.2 months). Five patients died at a median of 4.4 months from diagnosis. One and 5-year overall survivals were 50% and 38%, respectively. PMGCT are rare and aggressive. Our real-life Canadian experience is consistent with current literature suggesting that non-seminoma PMGCT has a poor prognosis despite prompt cisplatin-based chemotherapy followed by aggressive thoracic surgery.
- Published
- 2020
- Full Text
- View/download PDF
29. Anatomical characterization of the inguinal lymph nodes using microcomputed tomography to inform radical inguinal lymph node dissections in penile cancer.
- Author
-
Marshall K, Nair SM, Willmore KE, Beveridge TS, and Power NE
- Subjects
- Aged, Cadaver, Follow-Up Studies, Humans, Inguinal Canal diagnostic imaging, Lymph Nodes diagnostic imaging, Male, Penile Neoplasms diagnostic imaging, Prognosis, X-Ray Microtomography, Inguinal Canal pathology, Inguinal Canal surgery, Lymph Node Excision methods, Lymph Nodes pathology, Lymph Nodes surgery, Penile Neoplasms pathology, Penile Neoplasms surgery
- Abstract
Background & Objectives: Radical inguinal lymph node dissections (rILND) for penile cancer risk significant postoperative lymphocele and lymphedema. However, reducing the risk of lymphatic complications is limited by our understanding of lymphatic anatomy. Therefore, this study aims to elucidate the lymphatic anatomy within the current surgical borders of a rILND., Methods: To visualize the position of the lymph nodes, tissue packets excised from the inguinal region of five fresh, male cadavers were imaged using microcomputed tomography (µCT). To standardize the position, rotation and size between specimens, each lymph node packet was aligned using a Generalized Procrustes analysis., Results: There was a median of 13.5 lymph nodes (range = 8-18) per packet, with the majority (99%) clustered within a 6 cm radius of the saphenofemoral junction; a region 39%-41% smaller than current surgical borders. No difference existed between the number of nodes between sides, or distribution around the saphenofemoral junction., Conclusions: This study provides the first 3D, in situ, standardized characterization of lymph node anatomy in the inguinal region using µCT. By using knowledge of the normal lymphatic anatomy, this study can help inform the reduction in borders of rILND to limit disruption and ensure a complete lymphadenectomy., (© 2020 Wiley Periodicals LLC.)
- Published
- 2020
- Full Text
- View/download PDF
30. Long-term Testis Cancer Survivors in Canada-Mortality Risks in a Large Population-based Cohort.
- Author
-
Lavi A, Clark R, Ly TL, Nair SM, Hetou K, Haan M, and Power NE
- Abstract
Background: Testis cancer (TC) patients are young with excellent cancer prognosis. Hence, the risk of late-onset treatment-related morbidity and mortality is of concern due to longer survival after treatment., Objective: We set to characterize long-term survival of TC patients through a Canadian population dataset., Design Setting and Participants: We used a population-based dataset, the Canadian Census Health and Environment Cohort (CanCHEC), to identify individuals diagnosed with TC between 1991 and 2010. We compared them with all other male individuals without TC., Outcome Measurements and Statistical Analysis: The primary outcome was mortality due to cardiovascular disease (CVD) or nontesticular malignancy. Mann-Whitney or chi-square test was used where applicable. Data were analyzed using a Cox proportional hazard model with and without matching., Results and Limitations: We identified 1950 individuals with TC. We compared them with 1 300 295 men with no TC. There were 335 deaths in the study group during the study period (17.2%) with a mean follow-up of 19.6 yr. TC patients were at increased risk of death from secondary malignancies (hazard ratio [HR] 1.63, 95% confidence interval [CI] 1.39-1.91; p < 0.0001) with specific risks for hematologic neoplasms (HR 3.86, 95% CI 2.78-5.37; p < 0.001) and other malignancies (HR 2.41, 95% CI 1.76-3.29; p < 0.001). Gastrointestinal, hematologic, and respiratory toxicities were the most common secondary malignancies leading to death. When stratified according to histology, nonseminoma (NS) patients were at significantly increased risk of death from CVD (HR 2.03, 95% CI 1.27-3.25; p = 0.0032). Individuals with seminoma were at increased risk of death from other nontestis neoplasms (HR 1.46, 95% CI 1.17-1.82; p = 0.0007), specifically hematologic neoplasms (HR 2.09, 95% CI 1.18-3.72; p = 0.0118)., Conclusions: NS patients are at increased risk of CVD-related death, whereas seminoma patients are at increased risk of death from non-testis-related malignancies., Patient Summary: We report long-term mortality following diagnosis of testis cancer. Nonseminoma patients have an increased risk of death from cardiovascular disease, while seminoma patients have an increased risk of death from secondary malignancies., (Crown Copyright © 2020 Published by Elsevier B.V. on behalf of European Association of Urology.)
- Published
- 2020
- Full Text
- View/download PDF
31. The history of cryosurgery in Canada: A tale of two cities.
- Author
-
Chin JL, Donnelly BJ, Nair SM, and Lavi A
- Abstract
Although not commonly available in Canada, cryosurgery (cryoablation) for prostate cancer has been practiced in many countries. The field of cryoablation has evolved significantly over the past 30 years. Two prostate cryoablation programs were started in Canada in the early 1990s, in London, ON and Calgary, AB, focusing, respectively, on salvage therapy following radiation failure and primary local treatment. This article chronicles the development of the two programs and outlines the scientific and clinical contributions by investigators at the two centers.
- Published
- 2020
- Full Text
- View/download PDF
32. Abiraterone acetate preferentially enriches for the gut commensal Akkermansia muciniphila in castrate-resistant prostate cancer patients.
- Author
-
Daisley BA, Chanyi RM, Abdur-Rashid K, Al KF, Gibbons S, Chmiel JA, Wilcox H, Reid G, Anderson A, Dewar M, Nair SM, Chin J, and Burton JP
- Subjects
- Abiraterone Acetate metabolism, Abiraterone Acetate therapeutic use, Akkermansia, Androgen Antagonists pharmacology, Androgens metabolism, Bacteria metabolism, Feces microbiology, Humans, Male, RNA, Ribosomal, 16S genetics, Verrucomicrobia genetics, Verrucomicrobia metabolism, Vitamin K 2 metabolism, Vitamin K 2 pharmacology, Abiraterone Acetate pharmacology, Gastrointestinal Microbiome drug effects, Prostatic Neoplasms drug therapy, Prostatic Neoplasms, Castration-Resistant drug therapy, Verrucomicrobia drug effects
- Abstract
Abiraterone acetate (AA) is an inhibitor of androgen biosynthesis, though this cannot fully explain its efficacy against androgen-independent prostate cancer. Here, we demonstrate that androgen deprivation therapy depletes androgen-utilizing Corynebacterium spp. in prostate cancer patients and that oral AA further enriches for the health-associated commensal, Akkermansia muciniphila. Functional inferencing elucidates a coinciding increase in bacterial biosynthesis of vitamin K2 (an inhibitor of androgen dependent and independent tumor growth). These results are highly reproducible in a host-free gut model, excluding the possibility of immune involvement. Further investigation reveals that AA is metabolized by bacteria in vitro and that breakdown components selectively impact growth. We conclude that A. muciniphila is a key regulator of AA-mediated restructuring of microbial communities, and that this species may affect treatment response in castrate-resistant cohorts. Ongoing initiatives aimed at modulating the colonic microbiota of cancer patients may consider targeted delivery of poorly absorbed selective bacterial growth agents.
- Published
- 2020
- Full Text
- View/download PDF
33. Considerations for Newborn Screening for Critical Congenital Heart Disease in Low- and Middle-Income Countries.
- Author
-
Zheleva B, Nair SM, Dobrzycka A, and Saarinen A
- Abstract
We propose several considerations for implementation of critical congenital heart disease (CCHD) screening for low- and middle-income countries to assess health system readiness for countries that may not have all the downstream capacity needed for treatment of CCHD. The recommendations include: (1) assessment of secondary and tertiary level CHD health services, (2) assessment of birth delivery center processes and staff training needs, (3) data collection on implementation and quality surgical outcomes, (4) budgetary consideration, and (5) consideration of the CCHD screening service as part of the overall patient care continuum., Competing Interests: Conflicts of InterestThe authors declare no conflict of interest., (© 2020 by the authors.)
- Published
- 2020
- Full Text
- View/download PDF
34. Salvage open radical prostatectomy for recurrent prostate cancer following MRI-guided transurethral ultrasound ablation (TULSA) of the prostate: feasibility and efficacy.
- Author
-
Nair SM, Stern N, Dewar M, Siddiqui K, Smith E, Gomez JA, Moussa M, and Chin JL
- Subjects
- Ablation Techniques, Aged, Feasibility Studies, Humans, Male, Surgery, Computer-Assisted, Treatment Outcome, Urethra, Magnetic Resonance Imaging, Neoplasm Recurrence, Local surgery, Prostatectomy methods, Prostatic Neoplasms surgery, Salvage Therapy, Ultrasonic Surgical Procedures methods
- Abstract
Introduction: MRI-guided transurethral ultrasound ablation (TULSA) is a novel modality for minimally invasive ablation in patients with localised prostate cancer (PCa). A multi-national Phase 1 (30 patients) and subsequent Phase 2 (115 patients) study showed TULSA to be feasible, safe and well tolerated. However, technical viability and safety of salvage prostatectomy for those who failed TULSA is unclear. Herein, we report the feasibility and morbidity of salvage radical prostatectomy (sRP) post-TULSA. Methods: Four patients with biopsy-proven residual cancer following TULSA underwent open retropubic sRP within 39 months of TULSA. Peri-and post-operative morbidity were reported. Detailed histopathologic assessment is reported. Results: Median follow-up was 43 months after sRP. Mean operating times, blood loss, and length of stay were 210 min, 866 ml, and 3.5 days, respectively. Intraoperative finding of some fibrotic reaction of endopelvic and Denonvilliers fascia was characteristic. There were no perioperative complications. Whole-mount pathology sections showed one pT2b and three pT3a, suggesting under-staging pre-TULSA. Location of disease was compatible with persistent cancer mostly in the untreated peripheral safety region. One man received an artificial urinary sphincter. All men experienced erectile dysfunction responsive to treatment. Two patients with positive surgical margins had PSA progression requiring salvage radiation, with one requiring long-term androgen deprivation therapy. Conclusions: RP is a viable and safe salvage option if TULSA fails. Technical difficulty and perioperative morbidity were negligible and attributable to minimal peri-prostatic reaction from TULSA.
- Published
- 2020
- Full Text
- View/download PDF
35. Dynamic smile reanimation in facial nerve palsy.
- Author
-
Krishnan Santha K, Joseph S, Latheef S, Narayanan S, Nair SM, Babu B, Sivadasan A, Shet SM, Pydi RV, Pati A, and Samantaray SA
- Abstract
Objectives: Long-term facial paralysis results in degeneration of the distal nerve segment and atrophy of the supplied muscles. Options for these patients include free muscle transfer, temporalis myoplasty, and botulinum toxin injections for smile reanimation. In this study we aimed to evaluate the subjective and objective outcomes of these procedures., Materials and Methods: In our study, we retrospectively analyzed smile symmetry in patients with facial palsy (n=8) who underwent facial reanimation procedures., Results: Subjective analysis showed high satisfaction in seven out of eight patients. Objective analysis showed statistically significant improvement postoperatively in both vertical and horizontal smile symmetry at rest and during maximum smile ( P <0.001)., Conclusion: Choosing the ideal procedure for the patients is the most critical aspect for facial reanimation. Though free muscle transfer is considered gold standard procedure, temporalis myoplasty also gives satisfactory results. Residual synkinesis which can lead to disturbing aesthetic deformity can be effectively treated with botulinum toxin.
- Published
- 2020
- Full Text
- View/download PDF
36. Microcomputed Tomography Is a Precise Method That Allows for Topographical Characterization of Lymph Nodes and Lymphatic Vessels.
- Author
-
Fournier DE, Groh AMR, Nair SM, Norley CJD, Pollmann SI, Holdsworth DW, Power NE, and Beveridge TS
- Subjects
- Aged, Female, Humans, Male, Lymph Nodes diagnostic imaging, Lymphatic Vessels diagnostic imaging, X-Ray Microtomography
- Abstract
Background: Surgical excision and/or radiation targeting of regional lymph nodes are an essential component in the clinical management of cancer. Importantly, a more accurate understanding of lymphatic anatomy could enable refinement of present treatment strategies. Given the spatial resolution limitations of contemporary imaging methods, our group sought to utilize noncontrast-enhanced microcomputed tomography (μCT) imaging to clarify regional lymphatic anatomy. Methods and Results: This study was conducted with embalmed en bloc lymphatic tissue packets from six donors (three females and three males: median
age of death = 78 years). All specimens were investigated with noncontrast-enhanced μCT imaging using a conebeam-CT imaging system. Adipose and lymphatic tissues were segmented by radiodensity based on sampling regions of interest. To confirm the observations from μCT, lymph nodes from each packet were exposed to hematoxylin and eosin staining and anti-D240 immunostaining. Following μCT imaging, mean peak radiodensities of -203.14 ± 19.35 Hounsfield units (HU) and 37.25 ± 31.95 HU were revealed for adipose and lymphatic tissues, respectively ( p < 0.01). By analyzing histograms of the radiodensity distributions, we determined a threshold of -82.42 HU to differentiate adipose and lymphatic tissue, to generate three-dimensional renderings, and to calculate quantitative metrics. On average, adipose tissue comprised 9.62 ± 3.60 cm3 (73.6%) of the total packet volume, whereas lymphatic tissue comprised 3.47 ± 2.71 cm3 (26.4%). Moreover, each en bloc packet contained four small lymph nodes (1-5 mm) and three to four large lymph nodes (>5 mm). Histology corroborated the observations from μCT. Conclusions: Altogether, a precise understanding of regional lymphatic anatomy elucidated by the present imaging modality may help refine clinical cancer treatment strategies.- Published
- 2020
- Full Text
- View/download PDF
37. Spontaneous distal ureteric rupture: A rare case report and review of literature.
- Author
-
Low LS and Nair SM
- Abstract
Spontaneous rupture of the ureter is a very interesting and unusual phenomenon which normally occurs due to ureteral obstruction. We present a case of spontaneous rupture of the distal ureter, secondary to a ureteric calculus. Our patient presented with a history of acute on chronic abdominal pain and was septic on arrival to hospital., (© 2020 Editorial Office of Asian Journal of Urology. Production and hosting by Elsevier B.V.)
- Published
- 2020
- Full Text
- View/download PDF
38. Aspiration and sclerotherapy of hydroceles and spermatoceles/epididymal cysts with 100% alcohol.
- Author
-
Low LS, Nair SM, Davies AJW, Akapita T, and Holmes MA
- Subjects
- Adult, Epididymis, Ethanol, Humans, Male, Middle Aged, Patient Satisfaction, Retreatment statistics & numerical data, Retrospective Studies, Sclerosing Solutions therapeutic use, Suction, Testicular Diseases therapy, Cysts therapy, Sclerotherapy methods, Testicular Hydrocele therapy
- Abstract
Objective: To evaluate the efficacy of aspiration and sclerotherapy with 100% alcohol for the primary treatment of benign scrotal cysts., Methods: From March 2014 to March 2018, 114 patients were identified who underwent their first aspiration and sclerotherapy procedure (80 hydroceles and 34 spermatoceles/epididymal cysts). The procedure was carried out in the outpatient clinic with local anaesthesia. A 16-gauge IV catheter is used to puncture the sac under aseptic conditions. The volume of alcohol instilled was 10% of the aspirated volume (maximum of 50 mL). Patients were then observed in the waiting room and completed a questionnaire. Urology clinic follow up was scheduled at 6 weeks., Results: At follow up, 54 patients (67.5%) with hydroceles and 25 patients (73.5%) with spermatoceles/epididymal cysts had resolution after a single procedure. A second procedure was offered if fluid collection persisted, of which 71% of patients with hydroceles and 100% of patients with spermatoceles/epididymal cysts had a successful outcome. At a median of 31 months post-initial procedure, the overall success rate, after at most two procedures, was 80% for hydroceles and 85% for spermatoceles/epididymal cysts. The complication rate was low (6%). Almost all patients were happy to undergo the procedure again, if needed. Persistence following aspiration and sclerotherapy were more likely to occur in younger patients (45.4 versus 61.2 years, P = 0.001). Persistence was not related to the volume of fluid aspirated., Conclusion: Aspiration and sclerotherapy with alcohol is a reliable, safe and effective technique for treatment of benign scrotal cysts., (© 2019 Royal Australasian College of Surgeons.)
- Published
- 2020
- Full Text
- View/download PDF
39. Three Dimensional Rhinoplasty and Nasal Airway Improvement in Cleft-Nose Deformity.
- Author
-
Oommen J, Koyappathody HM, Kalathingal K, Thamunni CV, Joseph S, Shet SM, Pydi RV, Sivadasan A, Nair SM, Samantaray SA, Nithin RS, and Antony J
- Abstract
Septorhinoplasty is particularly challenging among revision surgeries for cleft sequelae. The challenge of cleft septorhinoplasty is mainly due to the complex anatomy of nose, deformity of each of its components and the difficulty and lack of clarity in surgical management. From 2014 to 2017, 26 patients with cleft lip nose deformity were operated by the same cleft team. The study was conducted to assess the improvement in nasal airway and appearance following secondary rhinoplasty with extracorporeal septoplasty. Post operatively each patient was evaluated using the standard modified rhinoplasty outcome evaluation questionnaire, a validated instrument that aids in stratifying patients according to their subjective response. All patients reported great relief of nasal obstruction and improved breathing. More than 80% of our patients were satisfied with improved aesthetics and reported better self-confidence. Secondary cleft rhinoplasty with extracorporeal septoplasty surgery significantly improves the cosmesis and nasal airway opening, subsequently giving them improved self-confidence., Competing Interests: Conflict of interestThe authors declare that they have no conflict of interest and there was no funding or grants involved., (© Association of Otolaryngologists of India 2019.)
- Published
- 2019
- Full Text
- View/download PDF
40. Examining Mannitol Use in Kidney Cancer Surgery: A Cautionary Tale of Extrapolated Surgical Data.
- Author
-
Nair SM, Power NE, and Coleman JA
- Subjects
- Acute Kidney Injury physiopathology, Acute Kidney Injury prevention & control, Cardiovascular Diseases complications, Cardiovascular Diseases mortality, Case-Control Studies, Clinical Trials as Topic, Diuretics, Osmotic adverse effects, Diuretics, Osmotic toxicity, Glomerular Filtration Rate drug effects, Humans, Iatrogenic Disease, Kidney drug effects, Kidney physiopathology, Kidney surgery, Kidney Neoplasms surgery, Mannitol adverse effects, Mannitol toxicity, Nephrectomy methods, Postoperative Complications prevention & control, Renal Insufficiency, Chronic etiology, Reperfusion Injury physiopathology, Reperfusion Injury prevention & control, Diuretics, Osmotic pharmacology, Kidney Neoplasms drug therapy, Mannitol pharmacology, Nephrectomy adverse effects
- Abstract
Mannitol for renal protection during partial nephrectomy is common but unsupported by evidence from clinical trials. The impact of mannitol on renal physiology includes both beneficial and harmful effects. Current understanding of renal ischemia reperfusion injury suggests potentially targetable processes that have a lower potential risk., (Copyright © 2019 European Association of Urology. Published by Elsevier B.V. All rights reserved.)
- Published
- 2019
- Full Text
- View/download PDF
41. Accessory right spermatic ganglion: possible embryological basis and clinical significance.
- Author
-
Nair SM, Power NE, and Beveridge TS
- Subjects
- Aged, Anatomic Variation, Cadaver, Dissection, Ganglia, Sympathetic embryology, Humans, Lumbosacral Plexus embryology, Lymph Node Excision methods, Male, Retroperitoneal Space surgery, Testis blood supply, Ganglia, Sympathetic abnormalities, Lumbosacral Plexus abnormalities, Testis innervation
- Abstract
The spermatic ganglia are collections of sympathetic neuron cell bodies located within the cords of the infrarenal aortic plexus, positioned at the origin of the testicular arteries in males. During routine dissection of the aortic plexus at our institution, one specimen exhibited a second (accessory) testicular artery on the right side that coursed retrocaval. Histology was used to confirm the presence of an accessory right spermatic ganglion at the base of the accessory retrocaval testicular artery. Interestingly, the accessory spermatic ganglion was also supplied by its own right lumbar splanchnic nerve. This is the first case to describe the anatomy of an accessory spermatic ganglion in a specimen that exhibits an accessory testicular artery on the right side. This neurovascular variation is of interest to surgeons who aim to perform nerve-sparing retroperitoneal lymph node dissections for malignancy.
- Published
- 2019
- Full Text
- View/download PDF
42. Enhancement of heavy metal tolerance and accumulation efficiency by expressing Arabidopsis ATP sulfurylase gene in alfalfa.
- Author
-
Kumar V, AlMomin S, Al-Shatti A, Al-Aqeel H, Al-Salameen F, Shajan AB, and Nair SM
- Subjects
- Biodegradation, Environmental, Medicago sativa, Plants, Genetically Modified, Sulfate Adenylyltransferase, Arabidopsis, Metals, Heavy
- Abstract
Transgenic alfalfa ( Medicago sativa L.) plants overexpressing the Arabidopsis ATP sulfurylase gene were generated using Agrobacterium -mediated genetic transformation to enhance their heavy metal accumulation efficiency. The ATP sulfurylase gene was cloned from Arabidopsis , following exposure to vanadium (V) and lead (Pb), and transferred into an Agrobacterium tumefaciens binary vector. This was co-cultivated with leaf explants of the alfalfa genotype Regen SY. Co-cultivated leaf explants were cultured on callus and somatic embryo induction medium, followed by regeneration medium for regenerating complete transgenic plants. The transgenic nature of the plants was confirmed using PCR and southern hybridization. The expression of Arabidopsis ATP sulfurylase gene in the transgenic plants was evaluated through RT-PCR. The selected transgenic lines showed increased tolerance to a mixture of five heavy metals and also demonstrated enhanced metal uptake ability under controlled conditions. The transgenic lines were fertile and did not exhibit any apparent morphological abnormality. The results of this study indicated an effective approach to improve the heavy metal accumulation ability of alfalfa plants which can then be used for the remediation of contaminated soil in arid regions.
- Published
- 2019
- Full Text
- View/download PDF
43. Calyceal-venous fistula of the kidney: A rare case report and review of literature.
- Author
-
Low LS, Nair SM, Wu L, Lanka L, and Devcich GA
- Published
- 2018
- Full Text
- View/download PDF
44. In silico Biological Activity of Steroids from the Marine Gastropods Telescopium telescopium Collected from South West Coast of India.
- Author
-
Ragi AS, Leena PP, Prashob KJP, and Nair SM
- Abstract
Background: The purpose of this study was to investigate the sterol profiling and predict the pharmacological potential of marine gastropod Telescopium telescopium (T. telescopium) , collected from mangrove ecosystem in the South west coast of India., Methods: Sterol fractions were separated from the crude lipids using 15% ethyl acetate. Ethyl acetate fractions were dried under ultrahigh purity N
2 and analyzed using GC-MS. The biological activity was predicted using the software CLC-Pred; In silico predictions of cytotoxicity for tumor and non-tumor cell lines and PASS., Results: This study proved the existence of four sterols, of which cholesterol was abundant. It was found that most of the steroids profiled from T. telescopium displayed activity against reproductive system as well as skin related diseases., Conclusion: The predicted anti infertility and skin related activity of the steroids identified from the marine gastropod T. telescopium is useful to attract industrial interest towards this species which will be helpful in rising new combinations with added therapeutic and nutritional worth.- Published
- 2018
45. Heavy metal concentrations in some gastropods and bivalves collected from the fishing zone of South India.
- Author
-
Ragi AS, Leena PP, Cheriyan E, and Nair SM
- Subjects
- Animals, Ecosystem, Fisheries, India, Trace Elements analysis, Environmental Monitoring, Gastropoda, Metals, Heavy analysis, Mollusca, Water Pollutants, Chemical analysis
- Abstract
The present study investigates heavy metal concentrations in gastropods and bivalves collected from major fishing centers in South India. Three gastropods, Bursa spinosa, Tibia curta, and Murex trapa, and two bivalves, Perna viridis and Villoritta cyprinoids, were collected for the analysis of heavy metals. The metals in the present study followed the order Mg>Ca>Zn>Fe>Cu>Mn>Cr>Pb>Ni>Co>Cd. Trace metal concentrations in the soft tissue of the molluscs varied as follows: for Cd: 0.04-5.33, Co: 0.09-0.87, Cr: 2.18-7.59, Cu: 9.54-37.02, Mn: 1.30-8.50, Ni: 0.94-3.21, Pb: 1.16-2.64 and Zn: 68.16-113.64mgkg
-1 . Metal concentrations in all the species were below the limits proposed by the World Health Organization, except for Pb and Cd. This baseline study suggests that the levels of toxic metals in M. trapa, T. curta, and B. spinosa should be continuously monitored to assess the fate and effects of these metals in this fragile ecosystem., (Copyright © 2017 Elsevier Ltd. All rights reserved.)- Published
- 2017
- Full Text
- View/download PDF
46. Correlation of Salivary Statherin and Calcium Levels with Dental Calculus Formation: A Preliminary Study.
- Author
-
Pateel DGS, Gunjal S, Math SY, Murugeshappa DG, and Nair SM
- Abstract
Background: Salivary constituents have a wide range of functions including oral calcium homeostasis. Salivary proteins such as statherin inhibit crystal growth of calcium phosphate in supersaturated solutions and interact with several oral bacteria to adsorb on hydroxyapatite. Concurrently, saliva, which is supersaturated with respect to calcium phosphates, is the driving force for plaque mineralization and formation of calculus. Thus, the aim of the present study was to estimate and correlate salivary statherin and calcium concentration to the dental calculus formation., Methods: A cross-sectional study was conducted to assess the relationship between salivary statherin, calcium, and dental calculus among 70 subjects, aged 20-55 years. Subjects were divided into 3 groups based on the calculus scores as interpreted by Calculus Index which was followed by collection of whole saliva using Super•SAL™. Salivary calcium levels were assessed by calorimetric method using Calcium Assay kit (Cayman Chemical, Michigan, USA) and statherin levels by using ELISA Kit (Cusabio Biotech)., Results: Statherin levels showed a weak negative correlation with the calcium levels and with calculus formation. The mean salivary statherin and calcium concentration were found to be 0.96 μ g/ml and 3.87 mg/ml, respectively. Salivary statherin levels differed significantly among the three groups ( p < 0.05)., Conclusions: Our preliminary data indicates that statherin could possibly play a role in the formation of dental calculus.
- Published
- 2017
- Full Text
- View/download PDF
47. HPLC profiling of antimicrobial and antioxidant phyco sugars isolated from the South West coast of India.
- Author
-
Kailas AP and Nair SM
- Subjects
- Anti-Bacterial Agents isolation & purification, Antioxidants isolation & purification, Bacteria drug effects, Chromatography, High Pressure Liquid, India, Seaweed chemistry, Sugars isolation & purification, Sulfates analysis, Anti-Bacterial Agents chemistry, Anti-Bacterial Agents pharmacology, Antioxidants chemistry, Antioxidants pharmacology, Sugars chemistry, Sugars pharmacology
- Abstract
Phyco sugars isolated from the South West coast of India are commercially and therapeutically interesting due to their various biological activities. These sugars were isolated from six (three red and three green) seaweed species using water at 100°C followed by precipitation using ethanol. The physical, chemical and biological characteristics were explored with specific highlights onto the specific rotation, HPLC-RI sugar speciation, antioxidant and antimicrobial activities. The biological properties were evaluated based on multiple methods and standards, such that the actual nature of the sugar is understood. G. corticata var. cylindrica (31.66%) had the highest sugar content. All the sugars had levo rotatory specific rotation and interesting chemical characteristics. Sugars isolated had competitive biological activities and had the presence of seven monosaccharides and one disaccharide. The results highlighted the socio-economic importance of seaweeds which could be developed as a potential source of bioactive compounds in the upcoming future., (Copyright © 2016 Elsevier Ltd. All rights reserved.)
- Published
- 2016
- Full Text
- View/download PDF
48. A Review of Laser Treatment for Symptomatic BPH (Benign Prostatic Hyperplasia).
- Author
-
Nair SM, Pimentel MA, and Gilling PJ
- Subjects
- Humans, Lasers, Solid-State, Male, Treatment Outcome, Volatilization, Laser Therapy methods, Prostatic Hyperplasia therapy
- Abstract
Benign prostatic hyperplasia (BPH) is the predominant cause of bladder outflow obstruction and is associated with significant morbidity. Surgical removal of adenoma has been a key treatment principle for alleviation of obstruction. Lasers have been used as an alternative to transurethral resection of the prostate (TURP), due to the higher complications of the latter procedure, since the early 1990s. Early generations of lasers utilized coagulative and ablative techniques to dis-obstruct the bladder. Ablative techniques have remained popular with the resurgence of 532-nm vaporization (commonly known as GreenLight). Enucleation techniques especially with the holmium laser have shown durable efficacy in randomized controlled trials whilst new modalities such as thulium still require long-term data. This review examines the most common types of laser technology used in BPH surgery, with a focus on efficacy and side effect profile.
- Published
- 2016
- Full Text
- View/download PDF
49. Tongue-lip adhesion in Pierre Robin sequence.
- Author
-
Krishna Kumar KS, Vylopilli S, Sivadasan A, Pati AK, Narayanan S, and Nair SM
- Abstract
Patients with Pierre Robin sequence exhibit varying degrees of airway obstruction and feeding difficulty. In some patients, airway obstruction may be profound, warranting surgical intervention to maintain a patent airway. The purpose of this article is to highlight the advantages of the tongue-lip adhesion procedure for the management of airway obstruction in such patients compared to the currently available options.
- Published
- 2016
- Full Text
- View/download PDF
50. Evolving and investigational therapies for benign prostatic hyperplasia.
- Author
-
Nair SM, Pimentel MA, and Gilling PJ
- Subjects
- Aged, Aged, 80 and over, Alcohols therapeutic use, Clinical Trials, Phase I as Topic, Clinical Trials, Phase II as Topic, Follow-Up Studies, Humans, Injections, Intralesional, Lower Urinary Tract Symptoms etiology, Lower Urinary Tract Symptoms physiopathology, Male, Patient Safety, Prostatic Hyperplasia complications, Prostatic Hyperplasia diagnosis, Risk Assessment, Treatment Outcome, Ultrasonic Therapy methods, Catheter Ablation methods, Drugs, Investigational therapeutic use, Embolization, Therapeutic methods, Lower Urinary Tract Symptoms therapy, Prostatic Hyperplasia therapy, Therapies, Investigational methods
- Abstract
Introduction: Lower urinary tract symptoms (LUTS) are common and are often caused by benign prostatic hyperplasia (BPH). Traditional surgical methods of open enucleation and transurethral resection of prostrate (TURP) have been efficacious in alleviating these symptoms however, these are operator dependent and often come with significant side effects. In this review, we will discuss upcoming new surgical techniques in management of BPH., Materials and Methods: A systematic search of SCOPUS, MEDLINE, EMBASE and Cochrane databases were carried out using relevant key words., Results: Intra-prostatic injections with a variety of agents have been explored as these can be readily performed under local anesthesia. Alcohol injections into the prostate have been abandoned due to potential side effects but there has been ongoing development of two alternative agents, NX-1207 and PRX-302. Both have shown good safety profiles and early efficacy in phase II studies. Thermal treatment with the Rezum device performed as an outpatient procedure has shown both safety and efficacy in phase I and II studies. Aquablation shows promise in phase II studies with few side effects and is a relatively an automated procedure, albeit requiring general anesthesia. Prostate artery embolization has been reported in a number of studies, but clinical outcomes have been unpredictable. Histotripsy has had a number of complications in animal models and despite technical improvement has not yet progressed beyond feasibility studies in humans., Conclusions: Some of the new techniques and technologies available for BPH have been shown to be relatively safe and efficacious and await validation with phase III studies.
- Published
- 2015
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.