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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.