C-reactive protein predicts functional status and correlates with left ventricular ejection fraction in patients with chronic stable angina
Received 13 March 2008; received in revised form 3 December 2008; accepted 8 December 2008. published online 02 March 2009.
Abstract
C-reactive protein (CRP) is a marker for cardiovascular risk but may also participate in the pathogenesis of atherosclerosis and myocardial injury. We sought to investigate the relationship among CRP, left ventricular ejection fraction (LVEF) and symptoms of congestive heart failure (CHF) in patients with chronic stable angina (CSA) pectoris.
Methods
We studied 841 patients (63±10 years, 72% men) with CSA undergoing coronary angiography. Symptoms of CHF were assessed using the New York Heart Association (NYHA) functional classification. CRP measurements were performed using a high sensitivity (hs-) immunoassay at the time of diagnostic coronary angiography.
Results
Baseline serum hs-CRP levels showed a significant correlation with LVEF (r=−0.11; P=0.004), and prevalence of moderate-to-severe CHF correlated with serum hs-CRP quartiles (Ptrend<0.0001). After adjustment, age (P=0.004), female gender (P=0.03), body mass index (P<0.0001) and hs-CRP (OR 2.2 [1.3–3.6] CI 95%; P=0.002) were independent predictors of NYHA functional classes III–IV irrespective of LVEF and angiographic severity of CAD. A CRP value of 3.2mg/L had a sensitivity of 72%, a specificity of 75%, and a negative predictive value of 96% for detecting an impaired functional class.
Interpretation
Hs-CRP serum concentrations showed an inverse correlation with LVEF and were an independent predictor of NYHA functional class in patients with CSA.
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