title: Short-term mortality, readmission, and recurrence in treatment of acute diverticulitis with abscess formation: a nationwide register-based cohort study.
abstract: OBJECTIVE
  The aim of the study was to investigate short-term mortality, readmission, and recurrence in a national cohort of patients with Hinchey Ib-II diverticulitis.
  
  
  METHODS
  The retrospective cohort-investigation was conducted using a database consisting of the entire Danish population (n = 6,641,672) in year 2000-2012, formed by linking the Danish Registers. Patients admitted with acute Hinchey Ib-II diverticulitis were identified from ICD-10 discharge codes and stratified according to treatment into an operative, drainage, and antibiotics group. The primary outcome was 30-day mortality from admission, secondary outcomes were mortality, readmission, and recurrence within 30 days post-discharge. The study was reported using RECORD guidelines.
  
  
  RESULTS
  A total of 3148 eligible patients were identified. The cohort had a mean age of 65.1 year, 25.6 % had previously been admitted with diverticulitis, and 48.1 % had registered comorbidities. Within 30 days from admission, 8.7 % of the patients died. Of patients discharged, 2.5 % died, 23.8 % was readmitted, and 5.9 % was readmitted due to diverticulitis within 30 days from discharge. In multivariate analyses, increasing age was associated with mortality at odds-ratio (95 % CI) 1.10 (1.09-1.12). Previous complicated and uncomplicated diverticulitis reduced mortality with odds-ratio 0.50 (0.33-0.76) and 0.73 (0.58-0.92), while uncomplicated diverticulitis also increased risk of recurrence with odds-ratio 1.51 (1.24-1.84). Glucocorticoid usage was associated with mortality with odds-ratio 1.49 (1.23-1.81) and readmission with odds-ratio 2.91 (1.24-6.80).
  
  
  CONCLUSIONS
  Acute diverticulitis with abscess formation is a severe and life-threatening condition. Direct comparisons of treatment groups were not possible due to possible confounding by indication.
authors.affiliation: Centre for Perioperative Optimization, Department of Surgery, Herlev Hospital, Herlev Ringvej 75, DK-2730, Herlev, Denmark. rasmusg90@gmail.com.|Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. rasmusg90@gmail.com.
authors.forename: Rasmus
authors.initials: R
authors.lastname: Gregersen
authors.affiliation: Centre for Perioperative Optimization, Department of Surgery, Herlev Hospital, Herlev Ringvej 75, DK-2730, Herlev, Denmark.|Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Kristoffer
authors.initials: K
authors.lastname: Andresen
authors.affiliation: Centre for Perioperative Optimization, Department of Surgery, Herlev Hospital, Herlev Ringvej 75, DK-2730, Herlev, Denmark.
authors.forename: Jakob
authors.initials: J
authors.lastname: Burcharth
authors.affiliation: Department of Surgery, Hvidovre Hospital, Hvidovre, Denmark.
authors.forename: Hans-Christian
authors.initials: HC
authors.lastname: Pommergaard
authors.affiliation: Centre for Perioperative Optimization, Department of Surgery, Herlev Hospital, Herlev Ringvej 75, DK-2730, Herlev, Denmark.|Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Jacob
authors.initials: J
authors.lastname: Rosenberg
mesh_terms: D018784:Abdominal Abscess / Q000150:complications*; D000208:Acute Disease; D000368:Aged; D015331:Cohort Studies; D003710:Demography; D003718:Denmark; D004238:Diverticulitis / Q000150:complications / Q000175:diagnosis / Q000401:mortality* / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D010359:Patient Readmission; D012008:Recurrence; D012042:Registries; D016896:Treatment Outcome
keywords: Abscess; Complicated diverticulitis; Danish registers; Diverticulitis; Mortality; Readmission