| Type | MGI:General | Description | develop bidirectional and polymorphic ventricular tachycardia upon stress testing and on administration of caffeine and of adrenergic agonists 5 of 14 heterozygotes undergoing stress testing followed by epinephrine administration develop repetitive ventricular arrhythmias (sustained (VTsus) and non-sustained (VTns) ventricular tachycardia) |
