Abstract
Graft denervation in heart transplant recipients causes sinus tachycardia, occasionally requiring pharmacologic heart rate reduction. Currently, no 12-month data regarding effects of the novel I(f) channel antagonist ivabradine on heart rate control, effects on left ventricular mass, tolerability, and safety are available in patients after heart transplantation (HTX). Mean heart rate, left ventricular mass indexed (LVMI) to body surface area, tolerability, and safety of ivabradine therapy were evaluated at baseline and after 12 months in 30 HTX recipients with marked sinus tachycardia. In three patients (10.0% of total), ivabradine medication was discontinued. Further analysis was based on 27 patients with 12-month drug exposure. Mean patient age was 53.3+/-11.3 years, and mean time after HTX was 5.0+/-4.8 years. Mean ivabradine dose was 12.5 mg/day (+/-3.3 mg). Mean heart rate was reduced from 96.2+/-8.6 beats per minute (bpm) at baseline to 80.9+/-8.1 bpm at follow-up (P<0.0001). A statistically significant effect of heart rate reduction on LVMI was observed (104.3+/-22.7 g at baseline vs. 95.9+/-18.5 g at follow-up, P=0.04). No statistically significant changes in immunosuppressive drug dosage or blood levels were observed, ...Continue Reading
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