Figure 1. (Upper) Twelve-lead electrocardiograph taken in the standard manner (left precordials). Precordial leads V²- V⁶show rapid ventricular tachycardia of the native heart, whereas lead V¹shows rapid sinus rhythm of the donor heart. (Lower) Twelve-lead electrocardiogram taken in mirror image (right sided). Precordial lead V sub 1R shows rapid ventricular tachycardia of the native heart, whereas leads V^2R- V^6Rshow rapid sinus rhythm of the heterotopic allograft.