A transient, potentially artificial, short QT interval can occur following Torsades de Pointes in patients with long QT syndrome.
Caution interpreting short QT post-TdP in LQTS; case report leaves open whether measurement timing affects diagnosis.
INTRODUCTION: We report the case of an 18-year-old female with recurrent syncope that was discovered to have congenital long QT syndrome (LQTS) and episodes of a transiently short QT interval after spontaneous termination of polymorphic ventricular tachycardia. METHODS & RESULTS: A cardiac event monitor revealed a long QT interval and initiation of polymorphic ventricular tachycardia by a premature ventricular complex on the preceding T-wave. After 1 minute of ventricular fibrillation, her arrhythmia spontaneously terminated with evidence of a short QT interval. CONCLUSIONS: A transient, potentially artificial, short QT interval following Torsades de Pointes can occur in patients with LQTS.
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Ifedili et al. (2024) studied this question.
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