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Figure 1 Twelve-lead electrocardiogram (ECG) in the baseline condition (A), after injection of 50 µg acetylcholine (ACh) into the right coronary artery (B), and after ventricular fibrillation (VF) induction by ACh (C) in a patient with Brugada syndrome. The baseline ECG shows coved or saddle-back type ST-segment elevation in leads V1 and V2. Injection of ACh augmented the ST-segment elevation in leads V1 and V2 (B, arrows), without any induction of coronary spasm, resulting in spontaneously induced VF.
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