Abstract:
BACKGROUND:epidemiologic studies indicate that elevated heart rate (HR) is an independent risk factor for mortality and morbidity in patients (pts) with chronic heart failure (CHF). Clinical trials with β-blockers suggest that HR reduction is an important mechanism of their benefit in pts with stable CHF. Pharmacologic inhibition of the I(f) current now provides the opportunity of pure HR reduction. The purpose of this study was to evaluate the impact of ''Off-Label'' use of ivabradine on exercise capacity, gas exchange, functional class, quality of life, and neurohormonal modulation in pts with ischemic CHF. METHODS:between January 2008 and June 2008, a graded maximal exercise test with respiratory gas analysis and an endurance test with constant workload corresponding to 85% of the peak VO(2) at the baseline and after 3 months were performed, and at the same times, N-terminal probrain natriuretic peptide (NT-proBNP) levels were also measured, in 60 pts (45 M, 15 F, mean age 52.7 ± 5.3 years), with stable ischemic CHF, New York Heart Association (NYHA) functional classes II (n = 35)-III (n = 25), with left ventricular ejection fraction (LVEF) ≤ 40%, randomized to a ''off-label'' ivabradine use (n = 30) and a control group (n = 30). RESULTS:the exercise capacity increased from 14.8 ± 2.5 to 28.2 ± 3.5 min (P < .0001) and the peak oxygen consumption tended to improve from 13.5 ± 1.3 to 17.9 ± 2.4 mL/kg per minute (P < .0001) in ivabradine group. Oxygen consumption at the anaerobic threshold (AT) increased from 11.9 ± 1.4 to 15.3 ± 1.4 mL/kg per minute (P < .0001). NTproBNP levels decreased from 2356 ± 2113 pg/mL to 1434 ± 1273 pg/mL (P = .045). No significant differences were found in control group at 3 months. The positive ivabradine effects were also associated with an improvement in the NYHA functional class and quality of life. CONCLUSION:the ''Off-Label'' use of ivabradine significantly improves the exercise capacity, gas exchange, functional heart failure class, quality of life, and neurohormonal modulation in pts with ischemic CHF.
journal_name
J Cardiovasc Pharmacol Therjournal_title
Journal of cardiovascular pharmacology and therapeuticsauthors
Sarullo FM,Fazio G,Puccio D,Fasullo S,Paterna S,Novo S,Di Pasquale Pdoi
10.1177/1074248410370326subject
Has Abstractpub_date
2010-12-01 00:00:00pages
349-55issue
4eissn
1074-2484issn
1940-4034pii
1074248410370326journal_volume
15pub_type
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