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Figure 4 (a) Conduction time (CT) at S1 and (b) CT at S2. There was no difference between the CT at S1 in patients with Brugada syndrome and that in the control group, but the CT at S2 in the Brugada syndrome group was markedly delayed at the right atrium-effective refractory period. The CT1 in the Brugada syndrome patients without atrial fibrillation (AF) was not different from that in the control group, but the CT2 in these Brugada syndrome patients was prolonged. (c) Inter-atrial conduction delay. The conduction delay (CD) was markedly prolonged in the Brugada syndrome group, and all patients with Brugada syndrome showed a positive CD. The CD was also prolonged in the Brugada syndrome patients without AF. Open circles show the Brugada syndrome patients with spontaneous AF. Solid circles show the Brugada syndrome patients without spontaneous AF. The error bars represent the 95% confidence interval.
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