Objective: To evaluate the effect of vitamin D supplementation on cardiovascular outcomes. Methods: After searching different databases, we retrieved and included randomized controlled trials on long-term supplementation of vitamin D (≥1-year intervention) and reporting cardiovascular outcomes. We calculated risk ratio (RR) with 95% confidence intervals (CI) for dichotomous outcomes. Results: Compared to the control group, the vitamin D group was not associated with a statistically significant decrease in the incidence of major adverse cardiovascular events (MACE) [risk ratio=0.99; 95% CI: 0.94–1.03]. We found no difference between the vitamin D group and the control group for the outcomes of incidences of myocardial infarction, heart failure, coronary revascularization, cardiovascular death, and all-cause mortality. The heterogeneity was low for all outcomes. Conclusion: According to our meta-analysis, vitamin D supplementation did not reduce major adverse cardiovascular events, other cardiovascular parameters, and all-cause mortality.

The efficacy and safety profile of mavacamten, a cardiac myosin inhibitor for the treatment of hypertrophic cardiomyopathy (HCM) is not well-established, prompting the need for an updated meta-analysis. The authors conducted an extensive search across multiple electronic databases, including Embase, MEDLINE (via Pubmed), and CENTRAL, to identify randomized controlled trials (RCTs) assessing the efficacy and safety of mavacamten in HCM. Review Manager 5.4 (Revman) was employed to pool risk ratios (RR) and mean differences (MD). Our literature search yielded 4 RCTs with a total of 503 patients. Mavacamten was found to be associated with higher rates of greater than or equal to 1 New York Heart Association (NYHA) class improvement (RR 2.20, 95% CI: 1.48–3.28; I²=51%) and change from baseline in the Kansas City Cardiomyopathy Questionnaire- Clinical Summary Score (KCCQ-CSS) (MD 7.50, 95% CI: 3.44–11.55; I² =50%). Mavacamten was also associated with improved resting left ventricular outflow tract (LVOT) gradient (MD −38.33, 95% CI: −49.38 to −27.28; I² =75%), Valsalva LVOT gradient (MD −48.08, 95% CI: −62.21 to −33.96; I² =78%), post-exercise LVOT gradient (MD −37.1, 95% CI: −44.37 to −29.84; I² =0%), LVMI (MD −16.91, 95% CI: −28.29 to −5.54; I² =88%), and lower rates of septal reduction therapy (SRT) (RR 0.30, 95% CI: 0.22–0.40; I² =0%). There were no significant differences between mavacamten and placebo regarding the composite functional outcome, greater than or equal to 1 treatment-emergent adverse event, greater than or equal to 1 serious adverse event, and atrial fibrillation. The authors; findings suggest that mavacamten contributes to improvements in NYHA class, KCCQ-CSS scores, and LVOT gradients while reducing the incidence of SRT in patients with HCM.