title: Self-expanding metallic stents for relieving malignant colorectal obstruction: a systematic review.
abstract: OBJECTIVE
  To assess the safety and efficacy of self-expanding metallic stents (SEMS) placement for the relief of malignant colorectal obstruction in comparison to surgical procedures through a systematic review of the literature.
  
  
  BACKGROUND
  Conventional therapies for relieving colorectal obstructions caused by cancer have high rates of morbidity and mortality, particularly when performed under emergency conditions, and palliative procedures resulting in colostomy creation can be a burden for patients and caregivers.
  
  
  METHODS
  A systematic search strategy was used to retrieve relevant studies. Inclusion of papers was established through application of a predetermined protocol, independent assessment by 2 reviewers, and a final consensus decision. Eighty-eight articles, 15 of which were comparative, formed the evidence base for this review.
  
  
  RESULTS
  Little high-level evidence was available. However, the data suggested that SEMS placement was safe and effective in overcoming left-sided malignant colorectal obstructions, regardless of the indication for stent placement or the etiology of the obstruction. Additionally, SEMS placement had positive outcomes when compared with surgery, including overall shorter hospital stays, and a lower rate of serious adverse events. Postoperative mortality appeared comparable between the 2 interventions. Combining SEMS placement with elective surgery also appeared safer and more effective than emergency surgery, with higher rates of primary anastomosis, lower rates of colostomy, shorter hospital stays, and lower overall complication rates.
  
  
  CONCLUSIONS
  Stenting appears to be a safe and effective addition to the armamentarium of treatment options for colorectal obstructions. However, the small sample sizes of the included studies limited the validity of the findings of this review. The results of additional comparative studies currently being undertaken will add to the certainty of the conclusions that can be drawn.
authors.affiliation: ASERNIP-S, Royal Australasian College of Surgeons, Adelaide, South Australia, Australia.
authors.forename: Amber M
authors.initials: AM
authors.lastname: Watt
authors.forename: Ian G
authors.initials: IG
authors.lastname: Faragher
authors.forename: Tabatha T
authors.initials: TT
authors.lastname: Griffin
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Rieger
authors.forename: Guy J
authors.initials: GJ
authors.lastname: Maddern
mesh_terms: D015179:Colorectal Neoplasms / Q000150:complications*; D013505:Digestive System Surgical Procedures / Q000379:methods*; D006801:Humans; D007415:Intestinal Obstruction / Q000209:etiology / Q000601:surgery*; D019919:Prosthesis Implantation / Q000295:instrumentation*; D015607:Stents; D016896:Treatment Outcome