Circulation. 2002;105:2462-2464
Published online before print May 6, 2002, doi: 10.1161/01.CIR.0000018948.95175.03
Published online before print May 6, 2002, doi: 10.1161/01.CIR.0000018948.95175.03
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(Circulation. 2002;105:2462.)
© 2002 American Heart Association, Inc.
Brief Rapid Communications |
Elevated C-Reactive Protein in Patients With Obstructive Sleep Apnea
From the Mayo Clinic Rochester, Rochester, Minn.
Correspondence to Virend K Somers, MD, DPhil, Divisions of Hypertension and Cardiovascular Diseases, Mayo Clinic Rochester, 200 First St, SW, Rochester, MN 55905. E-mail somers.virend{at}mayo.edu
Background— Obstructive sleep apnea (OSA) has been increasingly linked to cardiovascular and cerebrovascular disease. Inflammatory processes associated with OSA may contribute to cardiovascular morbidity in these patients. We tested the hypothesis that OSA patients have increased plasma C-reactive protein (CRP).
Methods and Results— We studied 22 patients (18 males and 4 females) with newly diagnosed OSA, who were free of other diseases, had never been treated for OSA, and were taking no medications. We compared CRP measurements in these patients to measurements obtained in 20 control subjects (15 males and 5 females) who were matched for age and body mass index, and in whom occult OSA was excluded. Plasma CRP levels were significantly higher in patients with OSA than in controls (median [range] 0.33 [0.09 to 2.73] versus 0.09 [0.02 to 0.9] mg/dL, P<0.0003). In multivariate analysis, CRP levels were independently associated with OSA severity (F=6.8, P=0.032).
Conclusions— OSA is associated with elevated levels of CRP, a marker of inflammation and of cardiovascular risk. The severity of OSA is proportional to the CRP level.
Key Words: sleep • inflammation • cardiovascular disease • risk factors
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