title: Impact of hospital volume on postoperative morbidity and mortality following a colectomy for ulcerative colitis.
abstract: OBJECTIVE
  Postoperative morbidity and mortality following a colectomy for ulcerative colitis (UC) has been primarily reported from tertiary care referral centers that perform a high volume of operations; however, the postoperative outcomes among nonselected hospitals are not known. We set out to evaluate postoperative morbidity and mortality using a nationally representative database and to determine the factors that influenced outcomes.
  
  
  METHODS
  We analyzed the 1995-2005 Nationwide Inpatient Sample to identify 7108 discharges for UC patients who underwent a total abdominal colectomy. The effects of hospital volume on postoperative morbidity and mortality were evaluated in logistic regression models adjusting for demographic and clinical factors.
  
  
  RESULTS
  Postoperative mortality and morbidity rates were 2.3% and 30.8%, respectively. Most operations were performed in low-volume hospitals that had an increased risk of death (adjusted odds ratio [aOR], 2.42; 95% confidence interval [CI]: 1.26-4.63). In-hospital mortality was increased in patients who were admitted emergently (aOR, 5.40; 95% CI: 3.48-8.40), aged 60-80 years (aOR, 8.70; 95% CI: 3.30-22.92), and those with Medicaid (aOR, 4.29; 95% CI: 2.13-8.66). Emergently admitted UC patients whose surgery was performed 6 days after their admission had significantly increased likelihood of in-hospital death (aOR, 2.12; 95% CI: 1.13-3.97).
  
  
  CONCLUSIONS
  Postoperative mortality was lowest in hospitals that performed the highest volume of operations. Increasing the proportion of total colectomies performed in high-volume hospitals may improve clinical outcomes for patients with UC.
authors.affiliation: Inflammatory Bowel Disease Clinic, University of Calgary, Calgary, Alberta, Canada. ggkaplan@ucalgary.ca
authors.forename: Gilaad G
authors.initials: GG
authors.lastname: Kaplan
authors.forename: Ellen P
authors.initials: EP
authors.lastname: McCarthy
authors.forename: John Z
authors.initials: JZ
authors.lastname: Ayanian
authors.forename: Joshua
authors.initials: J
authors.lastname: Korzenik
authors.forename: Richard
authors.initials: R
authors.lastname: Hodin
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Sands
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D003082:Colectomy / Q000009:adverse effects / Q000401:mortality*; D003093:Colitis, Ulcerative / Q000401:mortality* / Q000601:surgery*; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D017052:Hospital Mortality; D006801:Humans; D016015:Logistic Models; D008297:Male; D008484:Medicaid / Q000706:statistics & numerical data; D008875:Middle Aged; D016017:Odds Ratio; D010043:Outcome and Process Assessment, Health Care / Q000706:statistics & numerical data*; D018570:Risk Assessment; D012307:Risk Factors; D013997:Time Factors; D016896:Treatment Outcome; D014481:United States / Q000453:epidemiology