Fig. 2

Multipolar mapping of the APM with the linear duodecapolar catheter in patient 3. a, b High-density mapping of left ventricle using the linear duodecapolar catheter showed the site of earliest ventricular activation during clinical PVCs was located at the APM, which was marked with the red dot. c Intracardiac electrogram during PVCs demonstrated the earliest ventricular potential recorded at DD 1–2 (54 ms pre-QRS), and they conducted upward along the linear catheter. d Pacing from a site with earliest ventricular activation seen on DD 1–2 revealed a perfect pace map match. e Radiofrequency energy was delivered to the target site of the red dot with 52 ms pre-QRS and PVCs terminated following transient monomorphic non-sustained ventricular tachycardia. DD, duodecapolar catheter. Other abbreviations as in Fig. 1