Table 2.

Comparison of preoperative observation parameters between the control and treatment groups.

Parameter	Control group	Treatment group	P-value
Cardiothoracic ratio	0.65 ± 0.26	0.64 ± 0.21	0.867
Pulmonary artery pressure, mmHg	79.5 ± 2.9	80.0 ± 3.5	0.691
Left ventricular end-diastolic dimension, mm	21.9 ± 2.3	21.4 ± 2.7	0.625
Main pulmonary artery diameter, mm	15.9 ± 2.4	15.1 ± 2.6	0.412
Left pulmonary artery diameter, mm	10.3 ± 1.4	9.9 ± 1.5	0.502
Right pulmonary artery diameter, mm	9.9 ± 1.4	9.6 ± 1.5	0.529
Diameter of tracheal stenosis, mm	3.8 ± 1.8	4.1 ± 1.8	0.655

Data are presented as mean ± standard deviation.