St-qR pattern: new sign for diagnosis of anterior myocardial infarction during right ventricular pacing.

Abstract

In 4 patients with recent anterior wall myocardial infarction involving the ventricular septum, bipolar right ventricular apical stimulation resulted in small negative deflections preceding larger R waves (St-qR pattern) in leads I, aVL, and (except for Case 3) V6.