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eFigure 12–18. An example of drug-induced long QT syndrome. A common feature is a pause (often after an ectopic beat) with deranged repolarization in the following cycle. A 12-lead ECG recorded from a 79-year-old patient with advanced heart disease who had recently begun taking dofetilide. The abnormal QT interval is followed by a pause (star) and then four beats of polymorphic ventricular tachycardia (torsades de pointes). Sustained torsades de pointes then occurs after another pause. (Reproduced with permission from Kannankeril P et al. Drug-induced long QT syndrome. Pharmacol Rev. 2010;62(04):760–781.) A 12 lead electrocardiograph shows the rhythmic tracing indicative of drug induced long Q T syndrome.

Current Medical Diagnosis & Treatment 2024 > Inherited Arrhythmia Syndromes

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