Prognostic importance of plasma NT-pro BNP in chronic heart failure in patients treated with a beta-blocker: results from the Carvedilol Or Metoprolol European Trial (COMET) trial.

Author(s): Olsson LG, Swedberg K, Cleland JG, Spark PA, Komajda M, Metra M, Torp-Pedersen C, Remme WJ, Scherhag A, Poole-Wilson P, COMET Investigators

Affiliation(s): Department of Emergency and Cardiovascular Medicine Sahlgrenska Academy, Goteborg University, Goteborg, Sweden, and Department of Cardiology, La Pitie-Salpetriere Hospital, Paris, France.

Publication date & source: 2007-08, Eur J Heart Fail., 9(8):795-801.

Publication type: Randomized Controlled Trial

BACKGROUND: Plasma levels of N-terminal pro-brain natriuretic peptide (NT-pro BNP) are increased in patients with chronic heart failure (CHF). Beta-blockers (BB) may influence these levels but it is unclear whether changes in NT-pro BNP reflect concomitant changes in prognosis. OBJECTIVES: To assess the prognostic importance of NT-pro BNP at baseline and during follow-up, in patients in whom beta-blocker therapy is initiated. METHODS: In COMET, 3029 patients with CHF in NYHA class II-IV and EF<35% were randomised to carvedilol or metoprolol tartrate and were followed for an average of 58 months. Blood samples were collected for the measurement of NT-pro BNP at baseline (n=1559) and during follow-up (n=309). RESULTS: Baseline plasma concentrations of NT-pro BNP above the median (1242 pg/ml) were associated with higher all-cause mortality (RR 2.77; 95% CI 2.33-3.3, p<0.001). Patients who achieved NT-pro BNP levels<400 pg/ml during follow-up had a lower subsequent mortality (RR 0.32; 95% CI 0.15-0.69, p=0.004). CONCLUSIONS: The plasma concentration of NT-pro BNP is a powerful predictor of mortality in patients with CHF. Patients who achieve an NT-pro BNP of <400 pg/ml subsequent to treatment with a beta-blocker have a favourable prognosis.