Abstract
VT after MI is usually due to reentry through a protected isthmus bounded by functional lines of block (LoB). When VT is not inducible or not tolerated (unmappable VT) there is a need to unmask the isthmus by sinus mapping or pacing maneuvers. Experimental data suggest that sinus rhythm electrograms (EGM) along the central common pathway have a short duration compared to longer EGMs along LoBs. Using Carto® we aimed at identifying these isthmus-related LoBs by mapping the EGM duration during RV pacing.
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