4.2 LVA presence and whole left atrial electrophysiological degeneration
Total LVA size among the 143 patients with LVAs was 12.8 ± 8.6 cm2. The distribution of LVAs was the anterior region in 75%; septal region in 69%; roof region in 41%; posterior region in 32%; bottom region in 46%, and lateral region in 7%.
Whole left atrial electrophysiological degeneration was assessed by mean regional voltages and left atrial total conduction velocity. Patients with LVAs demonstrated lower mean regional voltages throughout all 6 regions than those without LVAs (Figure 1). Example cases showing the absence or presence of LVAs (<0.5 mV) and whole left atrial voltage reduction are presented in Supplementary Figure 1. In contrast, a longer left atrial total conduction time and lower left atrial total conduction velocity were demonstrated in patients with LVAs than in those without (Figure 2).