Vitamin D Deficiency-A Potential Role in Cardiovascular Disease Prevention

Inadequate levels of vitamin D are associated with an increase in the risk of cardiovascular disease and death, a new observational study has found. Dr Tami L Bair (Intermountain Medical Center, Murray, UT) reported the findings here at the American Heart Association 2009 Scientific Sessions.

Bair and colleagues followed more than 27 000 people 50 years or older with no history of cardiovascular disease for just over a year and found that those with very low levels of vitamin D (<15 ng/mL) were 77% more likely to die, 45% more likely to develop coronary artery disease, and 78% more likely to have a stroke than those with normal levels (>30 ng/mL). Those deficient in vitamin D were also twice as likely to develop heart failure as those with normal levels.

"We concluded that even a moderate deficiency of vitamin D was associated with developing coronary artery disease, heart failure, stroke, and death," said coauthor Dr Heidi May (Intermountain Medical Center). However, "it is not known whether this is a cause and effect relationship," she told heartwire. Because this study was observational, more research is needed "to better establish the association between vitamin D deficiency and cardiovascular disease," she noted.

Evidence so far suggestive of benefit of vitamin D

Vitamin D was the subject of much discussion in a general session on vitamins at the AHA scientific sessions. While there is strong evidence supporting the benefits of vitamin D in cardiovascular disease, there have been only a few randomized clinical trials, and previous observational studies "show no robust effects," said Dr Harald Dobnig (Medical University of Graz, Austria). The latter suffer from limitations, such as doses of vitamin D supplementation that are too low, low compliance rates, and short study duration, he noted.

There are some large randomized trials underway looking at outcomes with vitamin D; it is hoped that they will provide definitive answers in five to seven years, Dr Eric Rimm (Harvard School of Public Health, Boston, MA) explained.

"I think there's promise for vitamin D. We know that most people have insufficient vitamin D levels in their blood," Rimm says. "So although it will take five years until some of the trials that are adequately powered to look at cardiovascular disease with vitamin D will report, the epidemiology right now is suggestive that people should have 1000 or 2000 IU of vitamin D a day," he said.
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