Electrocardiographic abnormalities and ventricular tachyarrhythmias after myocardial infarction.

Aims: To assess the association of electrocardiographic repolarization and depolarization patterns to vulnerability to ventricular tachyarrhythmias.

Methods: In the present case-control study, a 12-lead ECG, signal-averaged ECG (SAECG), T-wave and QRS morphology, and T-wave alternans (TWA) were analyzed in post-MI patients with and without documented sustained ventricular tachycardia (VT) or fibrillation (VF) (VT/VF group, n=40, Non-VT/VF group, n=37, respectively) and healthy subjects (n=41).

Results: The QRS complex duration, measured from standard ECG (128 +/- 32 ms vs.