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An arrhythmogenic disorder characterized by stress-induced, bidirectional ventricular tachycardia that may degenerate into cardiac arrest and cause sudden death. Patients present with recurrent syncope, or sudden death after physical activity or emotional stress. CPVT3 is an autosomal recessive disorder with onset at early age and associated with sudden death in childhood. Patients manifest QT prolongation on adrenergic stimulation.