Ivabradine

Abstract

Ivabradine is a blocker of the funny current channels in the sinoatrial node cells. This results in pure heart rate reduction when elevated without direct effect on contractility or on the vessels. It was tested in a large outcome clinical trial in stable chronic heart failure (CHF) with low ejection fraction, in sinus rhythm, on a contemporary background therapy including betablockers (SHIFT: Systolic Heart Failure Treatment with the If inhibitor Trial).The primary composite endpoint (cardiovascular mortality or heart failure hospitalization) was reduced by 18% whereas the first occurrence of heart failure hospitalizations was reduced by 26%. The effect was of greater magnitude in patients with baseline heart rate ≥75 beats per minute. Ivabradine improved also the quality of life and induced a reverse remodelling.The safety was overall good with an increase in (a)symptomatic bradycardia and visual side effects.The efficacy and tolerability were similar to those observed in the overall trial in subgroups with diabetes mellitus, low systolic blood pressure (SBP), renal dysfunction or chronic obstructive pulmonary disease (COPD).Ivabradine is indicated in CHF with systolic dysfunction, in patients in sinus rhythm with a heart rate ≥75 bpm in combination with standard therapy including betablocker therapy or when betablocker therapy is contraindicated or not tolerated (European Medicine Agency).

Keywords: Cardiovascular mortality; Chronic heart failure; Funny channel; Heart failure; Heart rate; Hospitalizations; Sinoatrial node.