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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.