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Monophasic action potential (MAP) recordings from endocardium (Endo) and epicardium (Epi) of the right ventricular outflow tract of a Brugada patient. A prominent action potential notch is apparent in the epicardial MAP, but not in the endocardial MAP, coincident with the appearance of the accentuated J-wave or ST segment elevation in the ECG (V1). (Modified from ref. 2 with permission.)
