title: Covering ileo- or colostomy in anterior resection for rectal carcinoma.
abstract: BACKGROUND
  Anastomotic leakage is one of the most important complications that occur after surgical low anterior resection for rectal cancer. There are indications that anastomotic leak is associated with increased morbidity, mortality, frequent re-operation or radiological drainage, and prolonged hospital stay. Defunctioning stoma can be useful for patients undergoing a rectal surgery.
  
  
  OBJECTIVE
  To determine the efficacy of protective defunctioning stoma in low anterior resection for rectal carcinoma.
  
  
  METHODS
  Searches were conducted November 2009. We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE (from 1966) and EMBASE (from 1980).
  
  
  METHODS
  We included randomised clinical trials comparing the use of stoma versus "no stoma" in patients that received low anterior resection for rectal cancer.
  
  
  METHODS
  Six randomised controlled trials were identified and included in this review. Five trials were fully published in peer-reviewed journals. An attempt was made to obtain further information from the authors of the trial that was available only in an abstract form. The studies analysed the following outcomes: clinical anastomotic leakage, urgent reoperation, mortality and length of postoperative hospital stay. Review authors extracted the data independently, the risk ratios (RR) were estimated for the dichotomous outcomes and standardised mean difference were estimated for the continuous outcome
  
  
  RESULTS
  All the trials reported results for clinical anastomotic leakage, urgent reoperation and mortality. Only two trials reported the results for length of postoperative hospital stay.With respect to controls, use of covering stoma was significantly associated with less anastomotic leakage (RR 0.33; 95%CI [0.21, 0.53]) and less urgent reoperation (RR 0.23; 95%CI [0.12, 0.42] ). There was no significant difference in terms of mortality (RR 0.58; 95%CI [0.14, 2.33]). There was no evidence of statistical heterogeneity in any of the comparisons.
  
  
  CONCLUSIONS
  Covering stoma seems to be useful to prevent anastomotic leakage and urgent re-operations in patients receiving low anterior resection for rectal cancer. However, covering stoma does not seems to offer advantage in term of 30 days or long term mortality.
authors.affiliation: Epidemiology Department, Regional Health Authority of Umbria, Via Mario Angeloni 61, Perugia, Umbria, Italy, 06124.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Montedori
authors.forename: Roberto
authors.initials: R
authors.lastname: Cirocchi
authors.forename: Eriberto
authors.initials: E
authors.lastname: Farinella
authors.forename: Francesco
authors.initials: F
authors.lastname: Sciannameo
authors.forename: Iosief
authors.initials: I
authors.lastname: Abraha
mesh_terms: D003125:Colostomy / Q000379:methods*; D006801:Humans; D007082:Ileum / Q000601:surgery*; D016032:Randomized Controlled Trials as Topic; D012004:Rectal Neoplasms / Q000601:surgery*; D013529:Surgical Wound Dehiscence / Q000209:etiology / Q000517:prevention & control*
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