2 research outputs found
Effects of acute and chronic cobalt treatment on adult rat cardiomyocyte calcium handling
Patients with cobalt-chromium hip arthroplasties display increased cobalt levels in circulation. Elevated cobalt has been linked to cardiomyopathy, yet the mechanisms underlying cobalt-induced pathology remain unknown. Here, we have examined the effects of acute ( Cardiomyocytes were isolated enzymatically from adult male rats (n=9) and treated acutely for 5min, 1h and 24h with 1, 10 and 100µM CoCl2. After loading with Cal520 AM, calcium transients were measured during electrical pacing at 1Hz and sparks were recorded using confocal microscopy. Chronic cobalt effects were measured in cardiac preparations taken from adult male rats (n=8) injected daily with CoCl2(1mg/kg) for 28 days. A concentration and time-dependent decrease in Ca2+ transient amplitude was evident in cobalt-treated cells compared to controls, with 10μM CoCl2 inducing an amplitude reduction of 15.1±5.4% and 30.0±7.2% at 5min and 1h respectively and 100µM resulting in 25.6±0.05% and 58.8±0.09% reduction at 5min and 1h. Spark frequency was increased with 100µM cobalt relative to control, resulting in 55.4±0.9% and 76.8±1.4% increase at 5min and 1h. RyR2 expression in chronic cobalt-treated ventricular tissue was similar to controls, suggesting RyR2 post-translational modification may account for altered spark frequency. This study demonstrates reduced Ca2+ release and increased RyR2 activation in cardiomyocytes treated acutely with CoCl2. Indications suggest RyR2 phosphorylation may be involved in the negative inotropic effects observed
Predictors of Knowledge and Attitude Regarding Organ Donation in Kuwait
Background and objectives: In Kuwait, information regarding public knowledge and attitudes towards organ donation are scanty. This study aimed to evaluate public knowledge and attitude regarding organ donation and determine factors which predict them.
Methods: This cross-sectional study was conducted among 630 participants recruited from 27 randomly selected public cooperative societies and private supermarkets in Kuwait. A self-administered questionnaire was used to collect data.
Results: The prevalence rate of knowledge about organ donation was 68%, with a significantly higher rate among females than males (73% vs. 63%, respectively, p = 0.01). A composite score of knowledge was also higher among females than males (8.4 ± 5.8 vs. 6.8 ± 5.8, respectively, p = 0.001). In multivariate analysis, female gender (OR = 1.7; 95% CI =1.2, 2.4) and an educational level of bachelor’s degree or higher (OR = 2.6, 95% CI = 1.7, 3.9) were significant predictors of the knowledge. Among the barriers, more females than males mentioned about the fear of the operative procedures (p<0.001) and complications after the surgery (p = 0.011). Overall, 73% accepted the idea of organ donation during life, and 67% actually opted for donating their organs during life. However, almost everybody wanted to donate organs to their relatives.
Conclusion: The study identified factors predicting knowledge and attitude regarding organ donation. The results will help in planning how to improve the rate of donors in Kuwait.
IMC J Med Sci 2016; 10(1): 01-0