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Catecholaminergic polymorphic ventricular tachycardia ( CPVT ) is one of the leading causes of sudden arrhythmic death in the young. The  QT  interval in  CPVT  patients is typically within the normal range. However, those with prolonged  QT  interval have often been diagnosed with mutation‐negative long  QT  syndrome ( LQTS ). We report three  CPVT  patients with prolonged  QT  interval. Case 1 and 2 were diagnosed as  LQTS  at first. Genetic test using next‐generation sequencing ( NGS ) revealed  RyR2  mutations. We should consider genetic test using  NGS  to identify the genes responsible for  CPVT  in mutation‐negative  LQTS .

Three cases of catecholaminergic polymorphic ventricular tachycardia with prolonged QT intervals including two cases of compound mutations