Larger-than-recommended doses of vitamin D linked to decrease threat of atrial fibrillation


Taking higher-than-recommended doses of vitamin D for 5 years lowered the chance of atrial fibrillation in older women and men, in accordance with a brand new examine from the College of Japanese Finland.

Atrial fibrillation is the most typical arrhythmia, the chance of which will increase with age, and which is related to an elevated threat of stroke, coronary heart failure and mortality. Vitamin D has been proven to have an impact, for instance, on the atrial construction and {the electrical} perform of the center, suggesting that vitamin D would possibly stop atrial fibrillation.

Performed on the College of Japanese Finland in 2012–2018, the primary goal of the Finnish Vitamin D Trial, FIND, was to discover the associations of vitamin D supplementation with the incidence of cardiovascular ailments and cancers. The five-year examine concerned 2,495 contributors, 60-year-old or older males and 65-year-old or older girls, who had been randomized into three teams: one placebo group and two vitamin D3 supplementation teams, with one of many teams taking a complement of 40 micrograms (1600 IU) per day, and the opposite a complement of 80 micrograms (3200 IU) per day. All contributors had been additionally allowed to take their private vitamin D complement, as much as 20 micrograms (800 IU) per day, which originally of the examine was the advisable dose for this age group. At baseline, examine contributors had not been recognized with heart problems or most cancers, they usually accomplished complete questionnaires, each originally and all through the examine, on their existence and diet, in addition to on threat elements of ailments and illness incidence. Information on the incidence of ailments and deaths had been additionally obtained from Finnish nationwide well being registers. Roughly 20% of contributors had been randomly chosen for extra detailed examinations and blood samples.

In the course of the five-year examine, 190 contributors had been recognized with atrial fibrillation: 76 within the placebo group, 59 within the 40 micrograms group, and 55 within the 80 micrograms group. The danger of atrial fibrillation was 27% decrease within the 40 micrograms group, and 32% decrease within the 80 micrograms group, when in comparison with the placebo group. Within the sub-cohort chosen for extra detailed examinations, the imply baseline serum calcidiol focus, which is a marker of the physique’s vitamin D focus, was comparatively excessive, 75 nmol/l. After one 12 months, the imply calcidiol focus was 100 nmol/l within the 40 micrograms group, and 120 nmol/l within the 80 micrograms group. No important change within the calcidiol focus was noticed within the placebo group.

FIND is the primary randomized managed trial to look at that vitamin D supplementation reduces the chance of atrial fibrillation in usually wholesome women and men. Earlier analysis is proscribed to solely two randomized trials, which didn’t observe an impact when utilizing doses of 10 micrograms (400 IU) or 50 micrograms (2000 IU) per day. Additional affirmation of the current outcomes from the FIND examine is due to this fact wanted earlier than doses of vitamin D that considerably exceed present suggestions might be advisable for stopping atrial fibrillation. The FIND examine has beforehand printed findings displaying no affiliation with the incidence of different cardiovascular occasions or cancers.

The FIND examine was supported by funding from the Analysis Council of Finland, College of Japanese Finland, Juho Vainio Basis, Finnish Basis for Cardiovascular Analysis, Finnish Diabetes Analysis Basis, and Finnish Cultural Basis, and Medicinska Understödsföreningen Liv och Hälsa.


Journal reference:

Virtanen, J. Ok., et al. (2023) The impact of vitamin D3 supplementation on atrial fibrillation in usually wholesome women and men –the Finnish Vitamin D Trial. American Coronary heart Journal.