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Figure 3 Twelve-lead electrocardiogram in the baseline condition (A), after injection of 50 µg acetylcholine (ACh) into the right coronary artery (B), and after injection of 40 µg ergonovine maleate (EM) into the right coronary artery (C) in a patient with Brugada syndrome. Injection of ACh augmented the ST-segment elevation in leads V1 and V2, without any induction of coronary spasm (B, arrows), whereas injection of EM did not change the ST-segment elevation.
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