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Epicardial electrograms with isoproterenol administration in a BrS patient (patient 1). Unipolar (Epi 2 and Epi 4) and bipolar (Epi 2-3 and Epi 4-5) electrograms before (A) and after (B) isoproterenol administration in patient 1. J wave in the unipolar recording was diminished from 3.0 to 1.5 mV and potential after the QRS complex in the bipolar recording was shortened from 91 to 38 ms after isoproterenol administration.
