Published in:
01-03-2013 | Original Article
Severe obstructive sleep apnea increases mortality in patients with ischemic heart disease and myocardial injury
Authors:
Christine H. Won, Hyung J. Chun, Suparna M. Chandra, Priscilla S. Sarinas, Rajinder K. Chitkara, Paul A. Heidenreich
Published in:
Sleep and Breathing
|
Issue 1/2013
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Abstract
Objectives
We hypothesized that obstructive sleep apnea (OSA) has a dose-dependent impact on mortality in those with ischemic heart disease or previous myocardial injury.
Methods
We performed a retrospective cohort study of 281 consecutive OSA patients with a history of myocardial injury as determined by elevated troponin levels or with known existing ischemic heart disease. We compared survival between those with severe OSA [apnea–hypopnea index (AHI) ≥30] and those with mild to moderate OSA (AHI >5 and <30).
Results
Of the 281 patients (mean age 65 years, mean BMI 34, 98% male, 58% with diabetes), 151 patients had mild-moderate OSA and 130 had severe OSA. During a mean follow-up of 4.1 years, there were significantly greater deaths in the severe OSA group compared to the mild-moderate OSA group [53 deaths (41%) vs. 44 deaths (29%), respectively, p = 0.04]. The adjusted hazard ratio for mortality with severe OSA was 1.72 (95% confidence interval 1.01–2.91, p = 0.04).
Conclusions
The severity of obstructive sleep apnea is associated with increased risk of death, and risk stratification based on OSA severity is relevant even in the diseased cardiac patient.