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Sustained double-loop reentry (Patient 8). A–B: sinus rhythm activation and anatomical landmarks. The measurements for predicting isthmus and block line location are shown adjacent to panel B. C–D: The extrastimulation cycle leading to the reentrant VT episode shown at the bottom of the figure. E–F: double-loop reentrant VT activation map with sinus rhythm estimate or isthmus perimeter location overlaid in gray.
