Most patients with<unk>  are asymptomatic and are diagnosed solely by EKG in association with a history of using medications known to cause<unk><unk> . A minority of patients are symptomatic and typically present with one or more signs of arrhythmia, such as lightheadedness, syncope, or palpitations. If the arrhythmia persists, patients may experience sudden cardiac arrest.
Drug-induced QT prolongation
Benign early repolarization
Catecholaminergic polymorphic ventricular tachycardia
Tachycardia-induced cardiomyopathy
Sudden arrhythmic death syndrome
Toxic anterior segment syndrome
Pre-excitation syndrome
Long QT syndrome