Figure legend:
Figure 1 . Figure 1a – 12 lead ECG showing wide QRS tachycardia
of LBBB morphology. Figure 1b – 12 lead ECG showing sinus rhythm with
LBBB aberrancy. Figure 1c – On pacing from RA appendage, antegrade His
and HV interval of 45ms with LBBB aberrancy is seen. Figure 1d – On
pacing from lateral RA, retrograde His with VH interval of 10ms and QRS
of LBBB morphology is seen. Figure 1c and Figure 1d, His P – proximal
bipole and His D – distal bipole of quadripolar His catheter and RVA –
distal bipole of catheter in RV apex.
Figure 2. Intracardiac electrogram when septal refractory APC
was given. From top to bottom – 12 leads of surface ECG, LRA – distal
bipole of catheter in lateral right atrium, His P, His D and RVA as in
Figure 1.
Figure 3 . Intracardiac electrogram when septal refractory APC
was given. From top to bottom – I, aVF and V1 represent leads of
surface ECG, LRA p – proximal bipole and LRA d - distal bipole of
catheter in lateral right atrium, His P, His D and RVA as in Figure 1.