Figure 2.

A: The unipolar voltage map during sinus rhythm showed an isolated low-voltage area in the basal left ventricular (LV) posterolateral region. B: Pace-map match to the clinical ventricular tachycardia (VT) morphology was not observed at the posterolateral LV site with low voltages on endocardial unipolar voltage map but was obtained within a coronary sinus (CS) branch where the earliest ventricular activation during VT was recorded. C: The earliest ventricular activation during VT recorded within a CS branch is shown by a red asterisk, preceding QRS onset by 30 ms.