title: Early readmission of low-risk patients after coronary surgery.
abstract: BACKGROUND
  Early readmission after coronary artery bypass grafting (CABG) is an expensive adverse outcome. Although the perioperative experience of high-risk CABG patients has been studied extensively, little attention has been paid to low-risk CABG patients. The primary goal of this study was to identify the preoperative characteristics and to define risk predictors of readmission and preventive factors for readmission in low-risk isolated-CABG patients.
  
  
  METHODS
  We identified 2157 patients who underwent CABG between January 2000 and December 2005 at Washington Hospital Center, Washington, DC, and defined as low risk patients who had a Parsonnet bedside risk score lower than the 25th percentile. Patients who were rehospitalized within 30 days after surgery were compared with those who were not rehospitalized during this period.
  
  
  RESULTS
  The overall readmission rate for this study cohort was 6.3%. Compared with non-readmitted patients, early-readmitted patients were more likely to have diabetes mellitus (27.94% versus 20.88%, P = .05) and less likely to have hypertension (42.65% versus 51.36%, P = .05). Blood product transfusion (P < .01), postoperative length of intensive care unit stay (P = .01), and length of hospital stay (P = .05) were all significantly increased in the readmitted patients. The use of beta-blockers (P = .03) and angiotensin-converting enzyme inhibitors (P = .04) was significantly lower at discharge in this group of patients; however, multivariate regression analysis demonstrated diabetes (odds ratio, 1.59; 95% confidence interval, 1.08-2.42) to be the only independent predictor of early readmission.
  
  
  CONCLUSIONS
  For low-risk CABG patients, diabetes mellitus is the risk predictor of early readmission. Early discharge was not associated with early readmission.
authors.affiliation: Department of Cardiac Surgery, Washington Hospital Center, Washington, DC, USA.
authors.forename: Xiumei
authors.initials: X
authors.lastname: Sun
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Robert
authors.initials: R
authors.lastname: Lowery
authors.forename: Kathleen R
authors.initials: KR
authors.lastname: Petro
authors.forename: Peter C
authors.initials: PC
authors.lastname: Hill
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Haile
authors.forename: Jorge M
authors.initials: JM
authors.lastname: Garcia
authors.forename: Ammar S
authors.initials: AS
authors.lastname: Bafi
authors.forename: Steven W
authors.initials: SW
authors.lastname: Boyce
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Corso
mesh_terms: D015331:Cohort Studies; D001026:Coronary Artery Bypass / Q000706:statistics & numerical data*; D004219:District of Columbia / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D010359:Patient Readmission / Q000706:statistics & numerical data*; D011183:Postoperative Complications / Q000453:epidemiology*; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors