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Sleep apnea is associated with subclinical myocardial injury
Date:10/24/2013

Obstructive sleep apnea is known to be associated with an increased incidence of cardiovascular disease. Now a new study indicates that OSA is associated with subclinical myocardial injury, as indicated by increased high sensitivity troponin T (hs-TnT) levels. Elevated hs-TnT levels are predictive of both coronary heart disease (CHD) and heart failure (HF) in the general population. This is the first study to demonstrate an independent association between sleep apnea severity and this marker of early myocardial injury.

"Although OSA is associated with increased cardiovascular risk, a causal association has been hard to establish because of the association of OSA with other risk factors," said researcher Amil M. Shah, MD, MPH, of the Brigham and Women's Hospital in Boston. "In our study, we were able to demonstrate that greater OSA severity is independently associated with higher hs-TnT levels, suggesting a role for subclinical myocardial injury in the relationship between OSA and heart failure."

The findings were published online ahead of print publication in the American Thoracic Society's American Journal of Respiratory and Critical Care Medicine.

The study included 1,645 middle-aged and older participants in both the Atherosclerosis Risk in Communities and the Sleep Health Study who were free of CHD and HF at baseline. All subjects underwent overnight home polysomnography. Median follow-up was 12.4 years. OSA severity was categorized as none, mild, moderate, or severe using the respiratory disturbance index.

Hs-TnT levels, but not N terminal pro B-type natriuretic peptide levels (a marker for increased ventricular wall stress), were significantly associated with OSA after adjustment for 17 potential confounders (p=0.02), including age, gender, body mass index, smoking status, hypertension, diabetes, alcohol intake, pulmonary function variables (FEV1 and FVC), COPD status, systolic blood pressure, total cholester
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Contact: Nathaniel Dunford
ndunford@thoracic.org
American Thoracic Society
Source:Eurekalert

Page: 1 2

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