Table 4 Postoperative outcomes

Mechanical ventilation time (hr)

13.3 ± 9.1

10.1 ± 6.3

0.005

14.6 ± 10.3

10.2 ± 6.5

Length of ICU stay (days)

4.1 ± 2.3

3.0 ± 1.5

 < 0.001

4.4 ± 2.5

3.0 ± 1.3

POAF

53(46.9)

35(39.7)

0.38

40(50.6)

32(40.5)

RRT

3(2.6)

0

0.34

3(3.7)

0

Modified Rankin Scale

2.8 ± 0.7

2.9 ± 0.7

0.27

2.8 ± 0.7

2.9 ± 0.7

Length of hospital stay(days)

21.5 ± 14.3

17.5 ± 8.2

0.02

21.7 ± 9.4

18.0 ± 8.4

Stroke

10(8.8)

11(12.5)

0.54

7(8.8)

10(12.6)

WBC

8231.8 ± 2729.5

8431.8 ± 2572.7

0.59

8532.9 ± 2915.4

8463.2 ± 2585.3

CRP

11.0 ± 5.6

11.3 ± 6.7

0.75

11.6 ± 6.1

11.2 ± 6.8

Parameters of drains (operative)

 Pericardial total drainage(ml)

381.1 ± 361.8

309.4 ± 191.2

0.09

409.5 ± 412.9

303.7 ± 190.1

 Duration of pericardial drain(days)

2.7 ± 1.2

2.1 ± 0.6

 < 0.001

2.8 ± 1.4

2.1 ± 0.7

Mediastinal total drainage(ml)

485.0 ± 341.1

330.1 ± 165.9

 < 0.001

496.5 ± 331.3

331.9 ± 168.4

 Duration of mediastinal drain(days)

2.8 ± 1.3

2.1 ± 0.4

 < 0.001

2.8 ± 1.4

2.1 ± 0.5

Left pleural drain n(%)

29(25.6)

88(100)

 < 0.001

18(22.7)

79(100)

Left pleural total drainage(ml)

1124.3 ± 833.5

904.4 ± 640.9

0.14

1133.6 ± 977.9

960.6 ± 648.6

Duration of left pleural drain(days)

5.1 ± 2.2

3.7 ± 1.9

0.003

4.8 ± 2.6

3.9 ± 1.9

 Right pleural drain n(%)

36(31.8)

38(43.1)

0.13

25(31.6)

33(41.7)

 Right pleural total drainage(ml)

677.5 ± 538.5

544.2 ± 459.1

0.25

653.0 ± 544.4

546.0 ± 477.7

 Duration of right pleural drain(days)

4.1 ± 1.8

3.0 ± 1.5

0.006

3.9 ± 1.7

3.1 ± 1.6

 Late left pleural drainage n(%)

58(51.3)

16(18.1)

 < 0.001

43(54.4)

14(17.7)

 Late right pleural drainage n(%)

23(20.3)

14(15.9)

0.53

16(20.2)

13(16.4)

Late pericardial tamponade n(%)

10(8.8)

1(1.1)

0.03

8(10.1)

1(1.2)

 Total hospitalization costs(yen)

6,510,123.5 ± 1,264,319.0

6,134,096.0 ± 1,264,319.0

0.08

6,355,609.3 ± 1,408,680.9

6,162,882.7 ± 1,280,492.3