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Figure 2 Representative episodes of polymorphic ventricular tachycardia or ventricular fibrillation (VF) in a canine wedge model of the Brugada syndrome. All arrhythmias were spontaneously developed after the electrocardiogram with coved-type ST-segment elevation. Many of the arrhythmias (numbers 1 to 6) terminated within a few seconds, but the others (numbers 7 to 9) with a shorter cycle length (CL) degenerated into VF, which continued more than 5 s.