AI-guide PV isolation
Table 2 shows the procedure characteristics for the study
patients. Circumferential PVI was completed in all patients. LA
posterior wall isolation was performed in 29% and SVC isolation in
70%. Table 3 shows the details of PVI procedures. The
percentage of first pass PV isolation was 79% and 81%, respectively,
in the left and right circumferential PVI. Visitag data on the esophagus
region (Figure 2A, pink tags ) showed median RF application time
for 10 sec, median of average contact force at 9g, and median AI value
at 269.
After the first left circumferential PVI, no residual conduction gap on
the esophagus region in the posterior LA was found in 64 of 73 patients
(88%). Nine patients had 10 gaps on the esophagus region, included 5
gaps in the carina height level, 2 in the bottom of the LIPV level, 2 in
the LIPV level and one in the LSPV level. LAPW thickness at the carina
level in the patients with residual conduction gap was thicker than
those without gap (2.6 mm [interquartile range, 2.4-3.5 mm] vs. 2.1
mm [1.9-2.4 mm], P=0.004 by Wilcoxon test).
There were no major complications such as cardiac tamponade or stroke
associated with the ablation procedure. One patient suffered from
gastroparesis after the procedure, which recovered within one week
without any residual sequelae.