Study population
Baseline patient characteristics are shown in Table 1 . Both the minimum distance between the LA roof and esophagus and the minimum height of the LA roof from the point where the LAPW and esophagus make contact were evaluated in the sagittal plane of patients whose esophagi were located at the posterior of the LA roof. The mean distance and height measurements were 11.0 ± 4.3 mm and 8.9 ± 3.3 mm, respectively.