3.2 Electrophysiologic and CT-based findings, per study group
On voltage mapping, 1759 ± 767 points were acquired per patient. LAPWI
required 34 ± 12 ablation points: 16 ± 7 for the roof line and 17 ± 5
for the floor line. Gaps were detected in 22 patients (40%), with 22
gaps due to first-pass LAPWI failure and 4 due to dormant conduction
(Figure 3). A representative case of a gap in the center of the roof
line lesion is shown in the Figures 1 and 2. The electrophysiologic
features and LAPW thicknesses are shown per group in Table 2. Overall,
mean bipolar voltage along the ablation line and mean LAPW thickness
were greater in the Gap group than in the Successful first-pass group.
The roof line was longer, and mean
bipolar voltage and thickness of the LA wall at the roof line were
greater in patients with a gap in the roof line than in other patients.
However, no differences were seen in the floor line. Significant
correlation was found between LAPW thickness and bipolar voltage (r =
0.25, P < 0.0001) (Figure 4).