Table 1 General surgical information ( $\overline{\mathit{x}}$ ± s)

Gender (male/female, case)

136 (42.00)

Age (year)

50.67 ± 18.33

Mitral valve replacement (case)

248 (76.54)

Double valve replacement (case)

76 (23.46)

Concomitant tricuspid valve annuloplasty (case)

97 (29.94)

Concomitant thrombectomy (case)

54 (16.67)

Cardiopulmonary bypass time (min)

106.80 ± 25.72

Aortic occlusion time (min)

65.91 ± 20.01

Ventilation time (h)

20.70 ± 7.37

Chest tube drainage (ml)

358.11 ± 137.38