Definitions:
Previous neurologic disease: Cerebrovascular accident (CVA) or transient ischemic attack (TIA) diagnosed before the operation, with or without residual deficits.
Postoperative neurological events: new focal deficit after surgery; either TIA or CVA.
Long term ventilation: postoperative ventilation for more than 7 days, including reintubation or tracheostomy.
Respiratory complications: acute distress respiratory syndrome (ARDS) or pneumonia during the postoperative period.
Gastrointestinal (GI) complications: bowel ischemia, GI bleeding or laparotomy for any cause during the postoperative period.
Good LV: Ejection Fraction > 50%.
Fair LV: Ejection Fraction 30 -50%.
Poor LV: Ejection Fraction < 30%.