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.