Effect of vitamin D on endothelial and ventricular function in chronic heart failure patients: A prospective, randomized, placebo-controlled trial

• Published in: Medicine (Baltimore) Vol. 101; no. 29; p. e29623
• Main Authors: Woo, Jong Shin, Woo, Yeongmin, Jang, Jeong Yoon, Ha, Sang Jin
• Format: Journal Article
• Language: English
• Published: United States Lippincott Williams & Wilkins 22.07.2022
• Subjects: Cholecalciferol - therapeutic use; Clinical Trial/Experimental Study; Dietary Supplements; Double-Blind Method; Heart Failure; Humans; Prospective Studies; Quality of Life; Ventricular Function; Vitamin D; Vitamin D Deficiency - complications; Vitamin D Deficiency - drug therapy; Vitamins - therapeutic use
• ISSN: 1536-5964; 0025-7974; 1536-5964
• DOI: 10.1097/MD.0000000000029623

Low 25-hydroxyvitamin D (25OHD) levels are common in patients with chronic heart failure (HF) and are associated with increased mortality risk. This study aimed to establish the safety and efficacy of oral vitamin D3 (cholecalciferol) supplementation and its effect on endothelial and ventricular function in patients with stable HF. This study was an investigator-initiated, multicenter, prospective, randomized, placebo-controlled trial. Seventy-three HF patients with 25OHD levels < 75 nmol/L (30 ng/mL) were randomized to receive 4000 IU vitamin D daily or a placebo for 6 months. The primary endpoint was a change in endothelial function between the baseline and after 6 months as assessed using EndoPAT. Secondary endpoints included changes in echocardiographic parameters and differences in quality of life (6-min walking test and New York Heart Association functional status) at 6 months. There were no adverse events in either group during the study period. Vitamin D supplementation did not improve endothelial dysfunction (EndoPAT: baseline, 1.19 ± 0.4 vs 6 months later, 1.22 ± 0.3, P = .65). However, patients' blood pressure, 6-min walking distance, and EQ-5D questionnaire scores improved after vitamin D treatment. In addition, a significant reduction in the left atrial diameter was observed. A daily vitamin D dose of 4000 IU for chronic HF appears to be safe. This dosage did not improve endothelial function but did improve the 6-min walk distance, symptoms, and left atrial diameter at 6 months.