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Vitamin D and parathyroid hormone levels may not affect cardiovascular mortality
Date:12/15/2010

New York, NY, December 15, 2010 There is burgeoning public interest in possible wide-ranging health benefits from vitamin D, including cardiovascular health. In a study published in the December 2010 issue of The American Journal of Medicine, investigators found that there was no independent association between serum levels of vitamin D or parathyroid hormone and cardiovascular mortality in this prospective study, the first in a population of older community-dwelling adults with a low prevalence of vitamin D deficiency and a broad range of kidney function.

Researchers collected data from the Rancho Bernardo study, which was established in 1972. Between 1997 and 1999, 1091 participants attended a follow-up visit where blood samples were collected, along with detailed surveys of medical history, medications, cigarette smoking, alcohol consumption, and exercise; serum levels of 25-hydroxyvitamin D (25[OH]D) (mean 42 ng/mL), 1,25-dihydroxyvitamin D (1,25[OH]2D) (median 29 pg/mL), and intact parathyroid hormone (median 46 pg/mL) were measured; mean estimated glomerular filtration rate (eGFR) was 74 mL/min/1.73 m2. Using data from 1073 participants who qualified for this study, these people were followed for a median of 6.8 years (maximum 10.7 years). During this period, there were 266 deaths, including 111 cardiovascular deaths. Of those 111, 71 had normal kidney function (eGFR > 60 mL/min/1.73 m2) and 40 had reduced kidney function (eGFR < 60 mL/min/1.73 m2).

In populations with chronic kidney disease, low levels of 25(OH)D and 1,25[OH]2D, and high levels of intact parathyroid hormone have been suggested to explain the association between chronic kidney disease and cardiovascular mortality. Even in people with intact kidney function, there are multiple mechanisms that could link Vitamin D and cardiovascular disease.

"To our knowledge, this is the first prospective study to investigate the role of serum 25[OH]D, 1,25[OH]2D, and in
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Contact: Pamela Poppalardo
ajmmedia@elsevier.com
732-238-3628
Elsevier Health Sciences
Source:Eurekalert

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