References
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Legends for Figures:
Figure 1
Clinical arrhythmia: Monomorphic PVCs at bigeminal frequency. The morphology of the PVC is LBBB pattern with late precordial transition, left superior frontal plane axis with QRS duration of 140 ms. The coupling interval of the PVCs is 460ms.
PVC = premature ventricular contractions
LBBB = left bundle branch block
Figure 2
Recordings during electrophysiological study. From top to bottom, 12 leads of surface electrocardiogram, recordings from distal and proximal bipoles of the ablation catheter, high pass filtered (30 Hz) unipolar recording from distal and proximal electrodes of the ablation catheter and right ventricular recordings are shown. Earliest electrogram (25 ms pre-systolic) was recorded on the distal RV septum where ablation suppressed PVC.
Figure 3
Repetitive monomorphic VT triggering VF 6 hours after ablation. PVCs of the same morphology as the clinical PVC occurs with a short coupling interval of 240 ms and in a repetitive fashion (panel A). Panel B shows trigerring of VF by the VT.
VT = ventricular tachycardia; VF = ventricular fibrillation
Figure 4
Cryoballoon positioning for ablation at the moderator band. Figure 4a shows the cryoballoon inflated at the distal RV cavity. Figure 4b illustrates the cryoballoon loaded with a multipolar circular catheter (Achieve, Medtronic, MN, USA) positioned so that the multipolar catheter is distal to the moderator band allowing a stable position of the balloon on the moderator band.