Feasibility of functional substrate mapping with a novel lattice-tip catheter: implications for ventricular tachycardia ablation

Figures

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  Figure 1. Procedural images of a patient with ischemic cardiomyopathy who underwent ventricular tachycardia (VT) ablation because of recurrent implantable cardioverter-defibrillator shocks for sustained monomorphic VT episodes. The upper left part demonstrates an example of decrement-evoked potential (DeEP) mapping. A local abnormal ventricular activity potential (yellow bar) becomes a split potential during right ventricular pacing (green bar), displaying decremental properties during a short-coupled extrastimulus (orange bar). The upper right part shows the voltage map with scar dechanneling performed by adjustment of the voltage window and the local activation time (LAT) map during sinus rhythm. DeEPs were manually annotated. The lower right part demonstrates activation mapping with very-low-amplitude, high-frequency signals recorded at the critical isthmus as well as entrainment mapping at the area of interest, with concealed fusion and measurements compatible with pacing at the central isthmus.