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Figure 3 Putative Conducting Channels
An example of isopotential adjustment to show potential channels of higher regional voltage within the VLZ is shown in A in a 63-year-old woman with EF of 27% 8 years after inferior MI, and frequent SMVT. B shows a large area of confluent dense lateral scarring in a 67-year-old man with earlier inferolateral infarction, EF of 24%, and recurrent SMVT requiring ICD therapy. The left side shows an area of lateral very low voltage in the left anterior oblique projection. The right side displays a zone of voltage preservation adjacent to the mitral annulus. The marker tags represent points where VLPs were seen. One of the induced SMVTs in this patient exited from the superior mitral isthmus and was ablated here. All these channel types were less common in the control patients without SMVT. ICD = implantable cardioverter-defibrillator; VLP = very late potential; other abbreviations as in Figure 1.
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