Does ivabradine reduce NT-proBNP levels in outpatients with systolic heart failure, LVEF <40%, and heart rate >70 bpm?
Short-term ivabradine treatment significantly reduces NT-proBNP in patients with systolic heart failure, with the reduction closely correlating to the degree of heart rate lowering.
BACKGROUND: Heart rate (HR) reduction in patients with systolic heart failure (HF) is a cornerstone of current therapy. The aim of this study was to evaluate the short-term effect of the HR reduction with ivabradine on N-terminal pro-brain natriuretic peptide (NT-proBNP) in outpatients with systolic HF. HYPOTHESIS: Ivabradine improves survival and promotes left ventricle remodelling by reducing resting heart rate. Nt-ProBNP absolute and trends predict prognosis. We hypothesized a possible association between heart rate decrease and Nt-ProBNP values. METHODS: We included 25 outpatients with systolic HF on optimized medical therapy (80% on angiotensin-converting enzyme inhibitors, 56% on spironolactone, and 88% on β-blocker therapy), left ventricle ejection fraction 70/bpm. After a 1 month running-out period, to establish the clinical and NT-proBNP stability, patients were started on ivabradine for 3 months. RESULTS: Ivabradine decreased NT-proBNP (P = 0.002) from a median of 2850 pg/mL to 1802 pg/mL, corresponding to a median absolute and percent decrease of 964 pg/mL and 44.5%, respectively. The baseline HR correlated significantly with the baseline NT-proBNP (rs = 0.411, P = 0.041). The absolute and percent HR decrease correlated with the absolute NT-proBNP decrease (rs = 0.442, P = 0.027; rs = 0.395, P = 0.05). The greater the NT-proBNP absolute decrease tertile, the greater the baseline HR (P = 0.023) and the absolute (P = 0.028) and percent (P = 0.064) HR variation. CONCLUSIONS: In outpatients with systolic HF, the NT-proBNP reduction obtained by short-term ivabradine treatment correlates closely with the degree of HR reduction.
Sargento et al. (Thu,) studied this question.