Death occurred in @ % of patients , and @ % were readmitted within the first @ postoperative days.On multivariate analysis , AAE and SAE were both significantly associated with American Society of Anesthesiologists class @ ( AAE : odds ratio -LSB- OR -RSB- = @ , P = @ ; SAE : OR = @ , P = @ ) and inpatient status before procedure ( AAE : OR = @ , P < @ , SAE : OR = @ , P = @ ) .