Table 1.

Comparison of patients' preoperative general data between the two groups.

Item		Thoracoscopy-assisted group	Conventional group	P-value
Age (years)		68.3±2.6	69.1±3.6	0.946
Gender (male/female)		08-Dec	Nov-14
History of disease (years)		11.4±5.6	13.5±7.3	0.602
BMI		19.1±2.2	18.7±3.1	0.911
NYHA class	I	3	4	0.853
	II	8	8
	III	9	13
	IV	0	0
Mitral lesion type				0.941
Mitral stenosis		5	7
Mitral regurgitation		2	3
Mitral stenosis and regurgitation		13	15
Mitral stenosis	Mild	2	2	0.966
	Moderate	10	13
	Severe	6	7
Mitral regurgitation	Mild	1	2	0.730
	Moderate	8	11
	Severe	6	5
Moderate or severe tricuspid regurgitation		13	15	0.731
Cardiothoracic ratio		0.67 ±0.06	0.69±0.04	0.909
End-systolic length of the left atrium (mm)		60.7±5.1	63.5±6.2	0.821
End-diastolic length of the left ventricle (mm)		63.5±8.4	65.8±6.7	0.716
End-systolic length of the right atrium (mm)		71.2±7.3	74.5±10.9	0.625
End-diastolic length of the right ventricle (mm)		39.9±4.8	41.7±5.1	0.886
Pulmonary hypertension (mmHg)		66.5±9.6	69.7±11.8	0.686
Ejection fraction (%)		51.2±6.7	49.5±7.7	0.837
Ejection fraction <35%		0	0
Atrial fibrillation		12	14	0.787
Left atrial thrombosis		2	4	0.556
Hypertension		7	10	0.731
Diabetes mellitus		5	8	0.607
Hyperlipidemia		7	8	0.832
Aortic disease		0	0
Liver insufficiency		0	0
Renal insufficiency		0	0
Pulmonary infection		4	7	0.535
New cerebral infarction		0	0
New cerebral hemorrhage		0	0

BMI=body mass index; NYHA=New York Heart Association