N-terminal pro-B-type natriuretic peptide as a predictor of repeat coronary revascularization

Abstract

BACKGROUND: Recent studies suggest that natriuretic peptides are potential biomarkers for myocardial ischemia. However, little is known about the value of NT-proBNP as a predictor of repeat revascularization (RR) at follow-up angiography in patients with normal LV systolic function. METHODS: We collected and analyzed the clinical and angiographic data from 445 consecutive patients (62.5+/-10.1 years; 73% males) who showed normal LV systolic function and no regional wall motion abnormalities on transthoracic echocardiogram performed at baseline and follow-up angiography. RESULTS: Overall, NT-proBNP level on admission for follow-up angiography was significantly higher in patients with RR (n=55) than those without RR (n=390) [92.4 (47.5-178.5) pg/ml vs. 54.8 (30.6-93.1) pg/ml, P<0.001]. In asymptomatic patients, NT-proBNP did not show significant difference between patients with RR and those without RR (P=0.42). An elevated NT-proBNP level, especially in symptomatic patients (n=77) (>87.5 pg/ml as an optimal cut off value) was a strong independent predictor for RR at follow-up angiography (OR, 12.3; 95% CI, 3.25-46.2; P=0.001). NT-proBNP (>122.9 pg/ml) showed high specificity (85.9%) and negative predictive value (91.0%) for predicting RR in overall patients. However, NT-proBNP (>97.0 pg/ml) showed low sensitivity (49.1%) and positive predictive value (23.5%). The areas under the receiver operator characteristic (ROC) curve in predicting RR in overall patients and symptomatic patients were 0.648 (95% CI; 0.564-0.732, P<0.001) and 0.768 (95% CI; 0.653-0.884, P<0.001), respectively. CONCLUSION: Our data show that NT-proBNP level at follow-up is a strong independent predictor for RR especially in symptomatic patients. Although routine measurement may be not useful for predict RR, NT-proBNP may help to identify patients with low risk of repeat revascularization.