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Figure 2 (A to E) Surface electrocardiographic leads V2 and V5, intracardiac electrograms of the epicardium (Epi) at the free wall at the right ventricular outflow tract and signal-averaged electrocardiogram (SAECG) in Patients 1 (A), 2 (B), 3 (C), 4 (D) and 5 (E). Patients 1 and 2 are asymptomatic patients, and Patients 3, 4 and 5 are symptomatic patients. The late potentials, represented by the shaded area, are positive in all patients, showing the root mean square voltage of the terminal 40 ms in the filtered QRS complex (RMS40) <20 µV and the duration of low-ampltitude signals <40 µV in the terminal filtered QRS complex (LAS40) >40 ms, and correspond to a delayed potential after the QRS complex at the epicardium (arrows) in all patients. f-QRS = filtered QRS duration.
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