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Table 4 Perioperative variables independently predictive of cardiovascular intensive care 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

Variable Derivation cohort Internal validation
Wald χ2 OR (95% CI) OR (95% CI)
Patient variables    
  Age ≥70 years, per 10 years 20.56 1.23 (1.11, 2.66) 1.23 (1.12, 1.36)
  Chronic lung disease 14.40 1.49 (1.21, 1.83) 1.49 (1.21,1.87)
Ejection fraction (EF) a    
  EF 20-34% 6.03 1.64 (1.11, 2.44) 1.64 (1.05,2.37)
  EF <20% 13.54 3.06 (1.69, 5.55 3.06 (1.49,5.35)
Surgical variables    
  Single-valve repair or replacement + non-CABG surgeryb 5.86 1.41 (1.07, 1.86) 1.41 (1.05,1.82)
  Repair or replacements of ≥2 valvesb 6.2 2.13 (1.18, 3.86) 2.13 (1.00,3.88)
Postoperative CVICU variables    
  Cardiac arrest 65.06 4.04 (2.88, 5.66) 4.03 (2.69, 6.15)
  Pneumonia 77.84 3.08 (2.40, 3.96) 3.08 (2.37, 4.09)
  Pleural effusion 45.65 2.86 (2.11, 3.88) 2.86 (2.03, 3.83)
  Deep sternal wound infection 48.29 6.58 (3.87, 11.18) 6.57 (3.33,13.11)
  Leg graft harvest site infection 4.93 1.56 (1.05, 2.31) 1.56 (1.02,2.46)
  Gastrointestinal bleed 61.45 4.67 (3.18, 6.86) 4.66 (2.93,7.22)
  Neurologic complicationc 24.16 2.22 (1.61, 3.05) 2.21 (1.57, 3.17)
  1. aReference ejection fraction >50%; breference isolated coronary artery bypass; non-CABG procedures most commonly included left atrial appendage ligations, maze procedures, and atrial septal defect or patent foramen ovale closures; cneurologic complication defined as: cerebrovascular accident, intracranial hemorrhage, coma ≥24 hours, encephalopathy, or paralysis. CABG: coronary artery bypass grafting; CI: confidence interval; CVICU: cardiovascular intensive care unit; OR: odds ratio.