Atrial electrical abnormality in patients with Brugada syndrome assessed by signal-averaged electrocardiography

Figures

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  Fig. 1. Representative recordings of the P wave signal-averaged electrogram. A. The fPd (107 ms) in a patient in the control group. B. The fPd (125 ms) in a patient in the Brugada group. C. The fPD (138 ms) in a patient in the PAF group. fPD, filtered P wave duration; PAF, paroxysmal atrial fibrillation.

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  Fig. 2. The mean fPd of the control, Brugada, and PAF groups was 113.9 ± 12.9 ms, 125.3 ± 15.0 ms, and 137.1 ± 16.3 ms, respectively. The fPd in the PAF group was significantly longer than that in the control group (p < 0.01) and Brugada group (p < 0.05). The fPd in the Brugada group was significantly longer than that in the control group (p < 0.05) and shorter than that in the PAF group (p < 0.05). The abbreviations are the same as those in Fig. 1.

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  Fig. 3. The fPd in the subgroups of the Brugada group. A. There was no significant difference in the fPd between the patients with and without a history of syncope (122.7 ± 18.2 ms, 127.3 ± 12.3 ms; p = 0.5). B. There was no significant difference in the fPd between the patients with and without induced VF in the EPS (127.0 ± 16.7 ms, 122.4 ± 14.3 ms; p = 0.2). C. There was no significant difference in the fPd between the patients with a coved- and saddle back-type ST segment elevation (127.9 ± 17.5 ms, 123.7 ± 14.4 ms; p = 0.6). D. There was no significant difference in the fPd between the patients with and without induced AF in the EPS (114.5 ± 7.6 ms, 124.9 ± 16.8 ms; p = 0.2). AF, atrial fibrillation; VF, ventricular fibrillation Other abbreviations are the same as those in Fig. 1.