Diagnosis of inferior wall myocardial infarction during right ventricular apical pacing.

The diagnosis of inferior wall myocardial infarction is often masked during ventricular pacing. We observed paced ventricular beats with a qR pattern in leads 2,3, and aVF in a patient with acute inferior wall myocardial infarction and a temporary pacemaker at the apex of the right ventricle. Such a pattern might be specific for the diagnosis of inferior wall myocardial infarction, because it is never seen during uncomplicated pacing from anywhere within the right ventricular cavity.