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Figure 5 Duration of atrial potential and fragmented atrial activity (FAA). (a) Duration of A1. There was no difference between the duration of A1 in patients with Brugada syndrome and that in the control group. (b) Duration of A2. The duration of A2 in Brugada syndrome was markedly prolonged compared with that in the control group. The duration of A2 was also markedly prolonged in Brugada syndrome patients without atrial fibrillation (AF). (c) FAA. The ratio of the duration of A2 to A1 in the Brugada syndrome group was prolonged compared with that in the control group, and half of the patients with Brugada syndrome showed positive FAA, whereas only one patient in the control group showed positive FAA. The A2/A1 ratio was also prolonged in Brugada syndrome patients without AF. Open circles show Brugada syndrome patients with spontaneous AF. Solid circles show Brugada syndrome patients without spontaneous AF. The error bars represent the 95% confidence interval.
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