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Figure 1 (A) Twelve-lead electrocardiogram of a patient with the Brugada syndrome. The right precordial leads, V₁ to V₃, display a down-sloping ST segment elevation. QRS is normal but QT dispersion between V₂ and V₆ is larger than normal (120 ms). (B) Self-terminating polymorphic ventricular tachycardia (continuous recording) in a patient with the Brugada syndrome. Closely coupled premature ventricular contractions precede the onset of tachyarrhythmia. Note the disappearance of the repolarization abnormalities following the arrhythmia.