- ▪Recording of separate exit electrograms from a common isthmus during bimorphic ventricular tachycardia is possible using high-density mapping.
- ▪Differential propagation through a common isthmus may lead the wavefront to travel in 2 separate outer loops.
- ▪The difference in timing and cycle length observed arise from the different exit points from the isthmus and the subsequent time from the late diastolic signals to the onset of the QRS. This phenomenon highlights an alternate functional block within the common isthmus demonstrating the dynamic and 3-dimensional nature of the reentry isthmus, which previously was thought of as a 2-dimensional structure.
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