Diagnostic potential for verapamil in wide QRS complex tachycardia

Abstract Differentiation of ventricular tachycardia (VT) from supraventricular tachycardia (SVT) with aberrancy or a preexisting bundle branch block is difficult, 1–4 particularly if 1:1 retrograde atrioventricular (AV) conduction is present. 4 We describe a previously unreported and potentially diagnostic effect of verapamil when administered in the management of a wide QRS complex tachycardia.