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Increasing Gap Junction Coupling Reduces Transmural Dispersion of Repolarization and Prevents Torsade de Pointes in Rabbit LQT3 Model

Introduction: Increased transmural dispersion of repolarization (TDR) contributes importantly to the development of torsades de pointes (TdP) in long QT syndrome (LQTS). Intercellular electrical coupling via gap junctions plays an important role in maintaining TDR in both normal and diseased hearts. This study examined the effects of antiarrhythmic peptide AAP10, a gap junction enhancer, on TDR and induction of TdP in a rabbit LQT3 model.