Unfortunately, there is no absolute definition that describes the incidence of<unk> , as most data is obtained from case reports or small observational studies. Although QT interval<unk>  is one of the most common reasons for<unk>  withdrawal from the market, the overall incidence of<unk>  is difficult to estimate. One study in France estimated that between 5-7% of reports of ventricular tachycardia, ventricular fibrillation, or sudden cardiac death were in fact due to<unk>  and torsades de pointes. An observational study from the Netherlands showed that 3.1% of patients who experienced sudden cardiac death were also using a QT-prolonging<unk> .
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