Table 2. Dimensional change of the mean measurements in pulmonary vein diameter and area at each measurement site with p-values.

Pulmonary vein	Level 1		Level 2		Level 3
	Diameter (mm)	Csa (mm2)	Diameter (mm)	Csa (mm2)	Diameter (mm)	Csa (mm2)
LSPV	2.5	65.48	1.09	11	0.4	−5.9
	p<0.001	p<0.001	p<0.001	p = 0.028	p = 0.003	p = 0.004
RSPV	1.63	56.27	0.77	20.3	−0.2	−4.6
	p<0.001	p<0.001	p = 0.018	p = 0.016	p = 0.91	p = 0.92
LIPV	1.1	30.41	1.19	28.53	−0.3	−2.68
	p<0.001	p<0.001	p<0.001	p<0.001	p = 0.91	p = 0.97
RIPV	0.68	30.14	0	3.06	−0.04	−0.07
	p = 0.005	p = 0.005	p = 0.37	p = 0.32	p = 0.98	p = 0.97

Csa, cross-sectional area; LIPV, left inferior pulmonary vein; LSPV, left superior pulmonary vein; RIPV, right inferior pulmonary vein; RSPV, right superior pulmonary vein.