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Thyroid condition associated with increased heart failure risk among older adults

CHICAGO A hormonal condition known as subclinical hypothyroidism is associated with an increased risk of congestive heart failure among older adults, but not with other cardiovascular events and death, according to a study in the November 28 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.

Subclinical hypothyroidism (SH) refers to patients who have an elevated level of the hormone thyrotropin, also known as thyroid stimulating hormone (TSH), and a normal level of the hormone thyroxine (T4). The prevalence of SH increases with age, and is about ten percent in women over the age of 70, and somewhat lower in men, according to background information in the article. Subclinical hypothyroidism has been associated with higher levels of some cardiovascular risk factors, but data on cardiovascular outcomes and death are limited.

Nicolas Rodondi, M.D., MAS, of the University of California, San Francisco, and colleagues studied 2,730 men and women, aged 70 to 79, to determine whether subclinical hypothyroidism was associated with congestive heart failure (CHF, failure of the heart to pump blood with normal efficiency), coronary heart disease (CHD), stroke, peripheral arterial disease (PAD, partial or total blockage of an artery, usually an artery leading to a leg or arm), death, and cardiovascular-related death. Subclinical hypothyroidism was defined as TSH levels of 4.5-6.9 mIU/L (mild), 7.0-9.9 mIU/L (moderate), and 10 mIU/L or greater (severe).

The authors found that the incidence of CHF during a four-year follow-up period was significantly increased in patients with moderate and severe SH, but not in patients with mild SH, who comprised the highest percentage (68 percent) of all patients with SH in the study.

"In this population-based study of older adults, subclinical hypothyroidism was associated with a higher rate of incident and recurrent CHF among participants with a TSH level of 7.0 mIU/L or greater compar
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Contact: Wallace Ravven
415-476-2557
JAMA and Archives Journals
28-Nov-2005


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