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  • Title: Role of the Funny Current Inhibitor Ivabradine in Cardiac Pharmacotherapy: A Systematic Review.
    Author: Petite SE, Bishop BM, Mauro VF.
    Journal: Am J Ther; 2018; 25(2):e247-e266. PubMed ID: 26910057.
    Abstract:
    The pharmacology, pharmacokinetics, efficacy and safety of ivabradine are reviewed. Ivabradine is an oral medication that directly and selectively inhibits the hyperpolarization-activated cyclic-nucleotide gated funny (If) current in the sinoatrial node resulting in heart rate reduction. It has a plasma elimination half-life of 6 hours and is administered twice daily. Ivabradine is extensively metabolized by cytochrome P450 3A4, and its metabolism is affected by inducers and inhibitors of the 3A4 enzyme. Studies in patients with heart failure indicate that ivabradine improves surrogate markers such as exercise tolerance. The results of (1) phase III trial demonstrated ivabradine significantly reduced heart failure hospitalizations but had no effect on mortality. Ivabradine has been extensively evaluated for coronary artery disease wherein (2) large trials was shown to have no mortality benefit. Ivabradine has been associated with improved symptoms in stable chronic angina pectoris. Ivabradine has been evaluated for other cardiovascular conditions including tachycardias of various natures, arrhythmia prevention postcardiac surgery, in acute coronary syndrome, and for heart rate control during coronary computed tomography angiogram. The most common adverse events reported in clinical trials were bradycardia, new-onset atrial fibrillation, and phosphenes. Ivabradine, a novel cardiac medication, has been studied in numerous cardiac conditions. It is only currently approved in the United States to reduce hospitalizations for systolic heart failure. The role of this medication in other conditions has not been fully elucidated.
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