Does Vitamin D Provide Added Benefit to Antihypertensive Therapy in Reducing Left Ventricular Hypertrophy Determined...

Area of Science:

• Cardiology
• Endocrinology
• Public Health

Background:

• Left ventricular hypertrophy (LVH) and vitamin D deficiency are associated with hypertension (HTN) and cardiovascular disease, especially in African Americans (AAs).
• Uncontrolled HTN and LVH in AAs present a significant cardiovascular risk.
• Vitamin D deficiency is prevalent in populations at risk for cardiovascular disease.

Purpose of the Study:

• To investigate the effect of vitamin D supplementation on the regression of left ventricular mass index (LVMI) in vitamin D-deficient African Americans with uncontrolled hypertension and LVH.
• To determine if vitamin D addition to antihypertensive therapy improves cardiovascular outcomes.
• To assess changes in systolic blood pressure (BP) and LVMI after one year of intervention.

Main Methods:

• A randomized, double-blind, placebo-controlled, single-center study.
• Participants included African American patients with HTN (systolic BP >160 mm Hg), increased LVMI, and vitamin D deficiency (<20 ng/ml).
• Patients received standard antihypertensive therapy plus either 50,000 IU vitamin D3 biweekly or a placebo for one year.

Main Results:

• No statistically significant differences were observed in LVMI or systolic BP reduction between the vitamin D and placebo groups after one year.
• Serum vitamin D levels significantly increased in the vitamin D group compared to the placebo group (P < 0.001).
• The study achieved its primary endpoint regarding vitamin D level increase but not LVMI or BP reduction.

Conclusions:

• Vitamin D supplementation, when added to antihypertensive therapy, did not lead to greater regression of LVMI or reduction in systolic BP in this cohort of African Americans.
• The study's small sample size and low statistical power limit definitive conclusions regarding the therapeutic benefit of vitamin D.
• Further research with larger sample sizes is warranted to fully elucidate the role of vitamin D in managing hypertension and LVH in high-risk populations.