Results
Gaps occurred in 22 patients (40%) and in 26 (8%) of the 330 line
segments assessed—11 in the center roof line segment, 6 in the center
floor line segment, 4 in the right roof line segment, 4 in the right
floor line segment, and 1 in the left floor line segment. Gaps were
associated with relatively high bipolar voltage (3.38 ± 1.83 vs. 1.70 ±
1.12 mV, P < 0.0001) and a thick LA wall (2.52 ± 1.15
vs. 1.42 ± 0.44 mm, P < 0.0001). A modified AI ≤ 199
AU/mV, bipolar voltage ≥ 2.64 mV, wall thickness ≥ 2.04 mm, and roof
ablation line ≥ 43.4 mm well predicted gaps (AUCs: 0.783, 0.787, 0.858,
and 0.752, respectively).