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Bradycardia-Induced Torsades de Pointes in Atrioventricular Block
Pradnya Brijmohan Bhattad1, Anil Jha1, Richard Wholey1
1Cardiovascular Medicine, Saint Vincent Hospital, University of Massachusetts (UMass) Chan Medical School, Worcester, USA.
Abstract:
Bradycardia is known to prolong QT interval. Persistent bradycardia and high-grade atrioventricular (AV) block may lead to persistently prolonged QTc interval with a risk for life-threatening ventricular arrhythmias, which needs addressing the underlying cause. We present the case of a patient with persistent sinus bradycardia with a high-grade AV block leading to persistently prolonged QTc without any reversible etiology that resulted in torsades de pointes. The underlying treatment involved shortening the QTc by increasing the heart rate to prevent any further episodes of polymorphic ventricular tachycardia.
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