Figure 1.

Abnormal repolarization and ventricular fibrillation. A, Presenting ECG with right bundle-branch block; J-point elevation (arrows) <2 mV in leads V₁ to V₃; thus, not consistent with Brugada pattern. B, Ectopy with short-coupled PVCs. C, Short-coupled PVC initiates VF requiring ICD shock in the presence of quinidine. Over 16 months, proband had 168 appropriate ICD discharges for VF (≈8.6 per month). ICD indicates implantable cardioverter-defibrillator; VF, ventricular fibrillation; PVC, premature ventricular contraction.