Abnormal autonomic modulation of QT interval in patients with idiopathic ventricular tachycardia associated with clinically normal hearts.

27 patients with idiopathic ventricular tachycardia (VT) associated with a clinically normal heart (NHVT) and 20 normal subjects. All patients were in sinus rhythm, had normal atrioventricular conduction, and were in a drug-free state.

20 normal subjects

Cardiac autonomic activity (spectral analysis of heart rate variability) and ventricular repolarisation (QT intervals) measured from 24-hour ambulatory electrocardiogramssurrogate