Table 2 Postoperative parameters and clinical outcomes before and after IPTW-EW adjustment

Postoperative first ICU day

 APACHE II score

17.6 (5.9)

18.0 (5.5)

0.775

17 (5)

17 (6)

0.926

 SPAP, mmHg

30 (9)

40 (10)

< 0.001

30 (8)

37 (9)

0.007

 Lactate, mmol/L

3.2 (2.0, 5.2)

3.9 (2.4, 5.5)

0.568

1.9 (1.5, 3.5)

2.2 (1.6, 4.0)

0.933

 PaO₂, mmHg

119 (104, 146)

97 (74, 123)

0.003

119 (102, 135)

78 (72, 103)

0.002

 Pulmonary edema on CXR, n (%)

  Grade 1

9 (31)

3 (9)

0.003

5.8 (50)

0.4 (3)

< 0.001

  Grade 2

18 (62)

16 (49)

5.2 (45)

5.0 (38)

  Grade 3

2 (7)

14 (42)

0.6 (5)

7.9 (59)

Post-operative complications, n (%)

 Re-exploration for bleeding

2 (7)

2 (6)

1.000

0.5 (4)

0.8 (6)

0.872

 PGD

2 (7)

3 (9)

1.000

0.9 (8)

1.3 (10)

0.969

 Thrombotic complication

9 (31)

16 (49)

0.255

3.0 (26)

5.7 (43)

0.340

 Bloodstream infection

4 (14)

12 (36)

0.083

0.9 (8)

4.4 (33)

0.072

 Tracheal anastomotic leakage

1 (3)

4 (12)

0.433

0.8 (7)

0.5 (4)

0.610

 AKI

12 (41)

21 (64)

0.134

4.9 (43)

8.7 (65)

0.244

Clinical outcomes

 ECMO duration, day

2 (1, 2)

2 (2, 3)

0.119

2 (1, 2)

2 (2, 4)

0.390

 RBC transfused with 7 day, U

4.0 (0, 5.5)

3.5 (1.5, 6.0)

0.954

2 (0, 6)

2 (0, 3)

0.582

 CRRT, n (%)

3 (10)

5 (15)

0.854

1.1 (10)

1.8 (13)

0.980

 LOMV, hour

161 (40, 665)

62 (35, 480)

0.485

43 (19, 309)

38 (25, 258)

0.417

 Tracheostomy, n (%)

11 (38)

12 (36)

1.000

2.6 (22)

5.0 (38)

0.360

 LOICU, day

7 (4, 10)

7 (5, 16)

0.343

6 (5, 9)

7 (4, 9)

0.986

 LOHS, day

43 (31, 56)

47 (32, 71)

0.568

37 (30, 43)

35 (33, 63)

0.533

 28-day mortality, n (%)

2 (7)

10 (30)

0.045

0.5 (5)

3.9 (29)

0.017

 Hospital mortality, n (%)

6 (21)

14 (42)

0.120

2.5 (21)

8.0 (69)

0.035