Figure 3. Comparison of mean regional voltage between patients with and without recurrence of atrial fibrillation
Mean regional voltages between patients with and without recurrence of atrial fibrillation were compared. Mean regional voltage was calculated by averaging 10 evenly selected points in the region. The left atrium was divided into 6 regions. Patients with recurrence of atrial fibrillation demonstrated lower mean regional voltages throughout all regions than those without.
Figure 4.Recurrence rates of atrial fibrillation stratified according to the number of regions with mean voltage reduction
Recurrence rates of atrial fibrillation stratified according to the number of regions with mean voltage reduction were compared. A region with mean voltage reduction was defined as a region with a mean voltage < the region-specific cut-off value obtained using receiver-operator characteristics analysis for the prediction of atrial fibrillation recurrence (0.9 mV for anterior and septal, 1.0 mV for roof, 1.2 mV for posterior, 1.4 mV for bottom, and 1.8 mV for lateral). Recurrence rates became higher as the number of regions with mean voltage reduction increased.