title: Systematic review of definitions of failure in revisional bariatric surgery.
abstract: BACKGROUND
  There are no agreed definitions as to what constitutes a 'failure' of the primary bariatric procedure in relation to weight loss.
  
  
  METHODS
  The MEDLINE database for primary research articles was searched using obesity [title] or bariatric [title] and revision [title] or revisional [title].
  
  
  RESULTS
  The MEDLINE search retrieved 174 studies. After duplicates and exclusions were removed, 60 articles underwent analysis. Fifty-one studies included inadequate weight loss or weight regain as an indication for revision: 31/51 (61 %) gave no definition of failure, 7/20 quoted <50 % of excess weight loss at 18 months and 6/20 used <25 % excess weight loss.
  
  
  CONCLUSIONS
  The majority of published studies do not define failure of bariatric surgery, and <50 % excess weight loss at 18 months was the most frequent definition identified.
authors.affiliation: Medical Obesity Clinic, Leeds Teaching Hospitals NHS Trust, Leeds, UK, jakemann@doctors.org.uk.
authors.forename: Jake P
authors.initials: JP
authors.lastname: Mann
authors.forename: Adam D
authors.initials: AD
authors.lastname: Jakes
authors.forename: Jeremy D
authors.initials: JD
authors.lastname: Hayden
authors.forename: Julian H
authors.initials: JH
authors.lastname: Barth
mesh_terms: D050110:Bariatric Surgery / Q000379:methods*; D016208:Databases, Factual; D015390:Gastric Bypass / Q000379:methods; D006801:Humans; D010535:Laparoscopy / Q000379:methods; D009765:Obesity / Q000503:physiopathology / Q000601:surgery*; D012086:Reoperation / Q000379:methods; D009626:Terminology as Topic; D017211:Treatment Failure; D015431:Weight Loss