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Ionic and Cellular Basis of Antiarrhythmic Drug Therapy and Its Proarrhythmic Risks
Ibrahim Alameh1, Farid Farkouh2, Mohammed Kamareddine2
1Department of Internal Medicine, Lankenau Medical Center, Wynnewood, PA 19096, USA.
None:
This review explores the ionic and cellular mechanisms that underlie antiarrhythmic drug therapy, focusing on how modulation of ionic currents influences cardiac action potentials and refractory periods. Reentrant arrhythmias, the most common type of tachyarrhythmias, are managed by strategies that prolong the effective refractory period. The review also discusses the proarrhythmic risks associated with use-dependence and reverse use-dependence of ion channel blockers. Special attention is given to J-wave syndromes, where Ito blockade plays a pivotal role in preventing phase 2 reentry and polymorphic ventricular tachycardia. Mechanistic understanding is essential for enhancing drug safety and therapeutic efficacy in clinical practice.
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