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Table 2 Operative variables in patients with and without a cardiovascular intensive care unit readmission

From: Predicting cardiovascular intensive care unit readmission after cardiac surgery: derivation and validation of the Alberta Provincial Project for Outcomes Assessment in Coronary Heart Disease (APPROACH) cardiovascular intensive care unit clinical prediction model from a registry cohort of 10,799 surgical cases

Operative variable

No readmission (n = 10320)

Readmission (n = 479)

P value

Surgical priority, %

  

0.009

  Emergent

3.6

5.0

  Urgent in-hospital

40.0

46.3

  Urgent out of hospital

47.8

43.4

  Nonurgent out of hospital

8.6

5.2

Surgical incidence, %

  

0.01

  First operation

91.4

86.8

  Second operation

7.0

11.3

  Third or greater

1.6

1.9

Surgery, %

  

<0.001

  Isolated CABG

49.2

32.6

  CABG and single valve

7.7

12.1

  Isolated aortic valve repair or replacement

6.3

5.8

  Isolated mitral valve repair or replacement

2.4

1.9

  Multivalve repair or replacement

1.5

3.3

Intraoperative variables

   

  Cardiopulmonary bypass time, mean (SD) min

127.1 (67.2)

149.0 (56.2)

<0.001

  Aortic cross-clamp time, mean (SD), min

88.8 (55.8)

103.4 (48.8)

<0.001

  Intraoperative RBC transfusion, %

25.7

50.3

<0.001

  Intraoperative FFP transfusion, %

12.3

27.1

<0.001

  1. CABG: coronary artery bypass graft; FFP: fresh frozen plasma; RBC: red blood cell; SD: standard deviation.