Sluggish Upstroke of Signal-Averaged QRS Complex. An Arrhythmogenic Sign in Patients with Anteroseptal Myocardial Infarction

We conclude that there is a much more sluggish upstroke in the signal-averaged initial QRS complex in anteroseptal MI patients with VT, suggesting that the local conduction delay at the ventricular septum plays an important role in the mechanism of VT in these patients.