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ST-segment changes in leads V1 to V3 in one patient with Brugada syndrome during REM sleep. Twelve-lead electrocardiogram (ECG) showing progressive augmentation of ST-segment elevation in V1 and V2 and changes in the ST pattern in lead V3 from type 3 Brugada ECG (A) to type 2 (B) and type 1 (C). These tracings were recorded during the same REM period within a 13-second time frame.
