Table 2: Procedural characteristics and outcomes of patients with or without 30-day readmission.

Characteristic30-day readmission
NoYes value

Procedural characteristics
 Priority
  Emergent5.36.60.534
  Urgent50.947.9
  Elective43.945.6
 Procedure
  CABG60.751.00.007
  Valve22.430.1
  CABG/valve17.018.9
 On-pump surgery90.395.80.004
 Nadir hematocrit <20 on bypass15.020.50.029
 Cardiopulmonary bypass time (min) 0.393
 Time to initial extubation (min) 0.951
 Intraoperative myocardial infarction2.42.70.725
 Return to bypass4.24.60.730
Management
 RBC transfusions
  None67.658.70.001
  One8.910.0
  Two10.39.3
  Three or more13.222.0
 Use of 1 or more inotropes
  Arrive to ICU43.944.00.965
  After 4 hours37.244.00.034
  After 48 hours11.315.10.080
Adverse outcomes
 Low-cardiac output failure8.010.00.272
 Stroke1.11.50.525
 Mediastinitis0.42.7<0.001
 Acute kidney injury30.749.4<0.001
 Reintubation3.73.90.866
 Return to operating room for bleeding3.24.30.395
 New atrial fibrillation32.639.80.021
 Leg wound infection0.71.20.463
 Pneumonia1.70.80.275

CABG: coronary artery bypass graft surgery; RBC: packed red blood cell transfusion; ICU: intensive care unit.