Figure Legends
Figure 1 : A . A 12-lead electrocardiogram (ECG) during sinus rhythm. B . A 12-lead ECG during tachycardia with a cycle length of 240 ms. The ECG shows a relatively narrow QRS with sharp R wave, a superior left axis deviation and a right bundle branch block-type configuration. VA dissociation is also identified.
Figure 2: A . Right anterior oblique (RAO) and superior (SUP) view of a ventricular muscle activation map during the non-reentrant fascicular tachycardia (NRFT) , showing centrifugal activation from the earliest site at the ventricular septum (highlighted in red). The white circles indicate the sites where Purkinje potentials are recorded during sinus rhythm along the left anterior and posterior fascicles. The blue circles indicate the sites where preceding Purkinje potentials are recorded during the NRFT. The larger blue circle indicates the site of the earliest Purkinje potential recorded with the multi-spline duodecapolar catheter. The location of the breakout site to the ventricular muscle is the apex side of the earliest Purkinje potential site. We delivered radiofrequency current to the sites with red circle.B . Intracardiac electrogram during the NRFT mapping. The earliest Purkinje potential, preceding the QRS onset by 34 ms, is recorded by the electrodes 15-16 (blue asterisk) of the multi-spline duodecapolar catheter. HBE; his bundle electrogram, CS; coronary sinus, PEN; PENTARAY catheter.
Figure 3: Twelve-lead electrograms A . during ventricular tachycardia (VT), and B . during pacing from right ventricular septum and C . during pacing from left ventricular inferoseptum. We performed constant pacing from several sites of the ventricles with variable cycle lengths during the VT, however, only pacing waveforms were obtained and constant QRS fusion, indicating that the mechanism of the VT was reentry, could not be confirmed.