Catheter-based mapping and ablation of outflow tract ventricular arrhythmias can be guided by understanding anatomical relationships and expected changes in ECG morphology.
Provides a structured strategy for the catheter-based mapping and ablation of outflow tract ventricular arrhythmias, including differentiating posterior RVOT from right coronary cusp origins and mapping the LV summit.
The outflow tract (OT) regions of the right and left ventricles, common sites of origin for idiopathic ventricular arrhythmias (VA), have complex three-dimensional anatomical relationships. The understanding of in situ or "attitudinal" relationships not only informs the electrocardiographic interpretation of VA site of origin, but also facilitates their catheter-based mapping and ablation strategies. By viewing each patient as his or her own "control," the expected changes in ECG morphology (i.e., frontal plane QRS axis and precordial transition) between adjacent intracardiac structures (e.g., RVOT and aortic root) can be reliably predicted. Successful mapping of OT VAs involve a combination of activation and pacemapping guided by fluoroscopy, electroanatomical mapping, and intracardiac echocardiography. The purpose of this manuscript is to provide a simple, reliable strategy for catheter based mapping and ablation of OT VAs. We also discuss 2 specific challenges in OT VA mapping: (1) differentiating posterior RVOT from right coronary cusp VA origin; and (2) mapping VAs originating from the LV summit.
Hutchinson et al. (Mon,) conducted a review in Outflow tract ventricular arrhythmias. Catheter-based mapping and ablation was evaluated. Catheter-based mapping and ablation of outflow tract ventricular arrhythmias can be guided by understanding anatomical relationships and expected changes in ECG morphology.
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