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Figure 3 Activation isochrones for three consecutive cycles of ventricular tachycardia (VT). Isochrones are presented for each cycle, with the color legend (time in ms) displayed below (earliest activation is dark blue). White arrows indicate direction of wavefront propagation. Regions where no activation times were assigned because of small magnitude/–time of maximum negative derivative are shown as gray. Electrocardiogram lead II is shown with vertical blue lines indicating the time frames displayed for each cycle. (A) Isochrones from VT cycle 1. Top row shows measured isochrones. Bottom row shows noninvasively reconstructed isochrones. (B) Isochrones from VT cycle 2. (C) Isochrones from VT cycle 3. LAD = left anterior descending coronary artery; PDC = posterior descending coronary artery.
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