PMC5412644_01
The 12-lead electrocardiogram (ECG) at baseline and during tachycardia. A: The baseline ECG showed atrial fibrillation and narrow QRS complex. B: ECG during wide QRS complex tachycardia with left bundle branch block morphology, a superior axis, V5 transition, and QRS duration of 142 msec.
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Figure 1 demonstrated the 12-lead electrocardiogram (ECG) before and during wide QRS complex tachycardia.
Voltage and substrate mapping. A: Voltage mapping depicted no remarkable low voltage zone (defined by voltage <1.5 mV). B: The activation map of the ventricular tachycardia (VT) / ventricular premature complex (VPC) demonstrated the earliest activation site localized at the anterior mid free wall of the right ventricle, and a Purkinje potential (*) preceded the onset of wide QRS tachycardia by 30 msec. Pace mapping at the earliest activation site yielded 12/12 leads matched QRS morphology. C: Remapping after initial ablation showed another VT/VPC originating from the foci at a distance of 11.2 mm from the previous ablation site with a Purkinje potential (*) preceding VT/VPC by 32 msec. Pace mapping at the foci also yielded 12/12 leads matched QRS morphology comparing with the documented VT/VPC. Radiofrequency ablation successfully terminated the VT/VPC.
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Figure 1 demonstrated the 12-lead electrocardiogram (ECG) before and during wide QRS complex tachycardia.