Measurement of LAPW thickness
LAPW thickness was 2.8 mm (interquartile range, 2.5-3.2 mm) at the LSPV level, 2.2 mm (1.9-2.5 mm) at the carina level, 1.9 mm (1.8-2.1 mm) at the LIPV level, and 2.1 mm (1.9-2.4 mm) at the bottom of LIPV level, and the LA roof thickness was 3.2 mm (2.9-3.6 mm) (Figure 4 ). ANOVA revealed a significant difference in these wall thicknesses (P<0.0001). LAPW thickness at the 4 levels were all smaller than the roof thickness, and among them, LAPW thickness at the LIPV level was the minimal.