Key points are not available for this paper at this time.
The early after depolarization, which is an interruption of repolarization, can evoke a second upstroke or a salvo of action potentials. It is suggested that the electrophysiological characteristics of the early after depolarization can produce a lengthening of the QT interval and that the second upstroke and salvo of activity that may follow, it can explain many features of torsade de pointes and of certain other ventricular tachycardias. The early after depolarization, torsade de pointes, and repetitive monomorphic idiopathic ventricular tachycardia are all induced hy bradycardia or by a preceding long RH interal. The R‐on‐T phenomenon is also discussed.
Cranefield et al. (Wed,) studied this question.