Anatomical relationship between abnormal conduction zone and
contact area/low voltage area
Table 2 lists the anatomical relationship between the ACZ and
CoAs/LVA. The CoAs were found in all patients. A total of 185 CoAs
(average CoA per patient: 6.0±4.1 cm2) were
identified. A CoA was found in each of the three representative regions,
ascending aorta-anterior LA (3.2±1.8 cm2, 100 of 100
patients, 100%), descending aorta-posterior LA (0.6±1.3
cm2, 26 of 100 patients, 26%), and
vertebrae-posterior LA (2.1±2.7 cm2, 58 of 100
patients, 58%). CoA and number of CoA did not differ between the PAF
group and the non-PAF group. The overlapping rate of LVA and ACZ showed
a tendency to increase in the non-PAF group compared with the PAF group.
(Table 2 , mild LVA: 60.6±34.0% vs 42.1±36.2%, P=0.0099;
moderate LVA: 41.4±33.3% vs 24.8±30.4%, P=0.0109, severe LVA:
18.9±23.5% vs 10.3±19.9%, P=0.0502). On the other hand, the
overlapping rate of CoAs and ACZ did not differ between the PAF
(26.5±33.1%) and non-PAF (24.6±21.6%) groups. A larger LA size was
associated with a higher overlapping rate of LVA (at each cut-off value)
and ACZ. In contrast, the overlapping rate of CoAs and ACZ did not
differ among the normal/mildly, moderately, and severely enlarged LA
group.