title: Surgical treatment of uncomplicated diverticulitis in Switzerland: comparison of population-based data over two time periods.
abstract: OBJECTIVE
  The standard of care for acute uncomplicated diverticulitis used to be an elective colon resection after the second or third episode. This practice was replaced by a more conservative and individualized approach. This study investigates current surgical practice in the treatment of acute uncomplicated diverticulitis in Switzerland.
  
  
  METHODS
  Retrospective cross-sectional analysis of all hospital admissions due to uncomplicated diverticulitis in Switzerland using prospectively collected data from the Swiss Federal Statistical Office in two periods: 2004/2005 and 2010/2011. Treatment options were compared between the two periods with adjustment for baseline characteristics of patients and treating institutions.
  
  
  RESULTS
  A total of 24 497 patients (11 835 in 2004/2005; 12 662 in 2010/2011) were admitted to Swiss hospitals for uncomplicated diverticulitis. Between periods, the incidence increased from 81 to 85 admissions per 105inhabitants per year. Elective admissions decreased from 46% (n = 5490) to 34% (n = 4294). The unadjusted resection rate decreased from 40% (n = 4730) to 34% (n = 4308). In the adjusted analysis, inpatients were more likely to have a resection in 2010/2011 than in 2004/2005 [odds ratio of 1.38 (95% confidence interval 1.25-1.54)]. In addition, private insurance, elective mode of admission and younger age increased the odds for resection while there was no evidence of an association between resection and either gender or comorbidities.
  
  
  CONCLUSIONS
  The probability of colon resection for patients hospitalized with acute uncomplicated diverticulitis increased between periods while the overall number of colon resections declined. A change of practice expected given the paradigm shift towards conservative treatment could not be confirmed in this analysis.
authors.affiliation: Department of Surgery, Cantonal Hospital Aarau, Aarau, Switzerland.|Department of Surgery, University Hospital Basel, Basel, Switzerland.|Colorectal Unit, Western General Hospital Edinburgh, Edinburgh, UK.
authors.forename: M
authors.initials: M
authors.lastname: von Strauss Und Torney
authors.affiliation: Basel Institute for Clinical Epidemiology and Biostatistics, Basel, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Thommen
authors.affiliation: Department of Surgery, University Hospital Basel, Basel, Switzerland.|Basel Institute for Clinical Epidemiology and Biostatistics, Basel, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Dell-Kuster
authors.affiliation: Department of Surgery, University Hospital Basel, Basel, Switzerland.
authors.forename: H
authors.initials: H
authors.lastname: Hoffmann
authors.affiliation: Department of Surgery, University Hospital Basel, Basel, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Rosenthal
authors.affiliation: Basel Institute for Clinical Epidemiology and Biostatistics, Basel, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Young
authors.affiliation: Department of Surgery, University Hospital Basel, Basel, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Kettelhack
mesh_terms: D000368:Aged; D003082:Colectomy / Q000379:methods / Q000639:trends*; D000072700:Conservative Treatment / Q000379:methods / Q000639:trends; D003430:Cross-Sectional Studies; D004239:Diverticulitis, Colonic / Q000601:surgery*; D017558:Elective Surgical Procedures / Q000379:methods / Q000639:trends*; D005260:Female; D006760:Hospitalization / Q000639:trends; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D013557:Switzerland
keywords: Diverticulitis; epidemiology; overtreatment