title: Short-term outcomes after laparoscopic colorectal surgery in patients with previous abdominal surgery: A systematic review.
abstract: OBJECTIVE
  To perform a systematic review focusing on short-term outcomes after colorectal surgery in patients with previous abdominal open surgery (PAOS).
  
  
  METHODS
  A broad literature search was performed with the terms "colorectal", "colectomy", "PAOS", "previous surgery" and "PAOS". Studies were included if their topic was laparoscopic colorectal surgery in patients with PAOS, whether descriptive or comparative. Endpoints of interest were conversion rates, inadvertent enterotomy and morbidity. Analysis of articles was made according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses.
  
  
  RESULTS
  From a total of 394 citations, 13 full-texts achieved selection criteria to be included in the study. Twelve of them compared patients with and without PAOS. All studies were retrospective and comparative and two were case-matched. The selected studies comprised a total of 5005 patients, 1865 with PAOS. Among the later, only 294 (16%) had history of a midline incision for previous gastrointestinal surgery. Conversion rates were significantly higher in 3 of 12 studies and inadvertent enterotomy during laparoscopy was more prevalent in 3 of 5 studies that disclosed this event. Morbidity was similar in the majority of studies. A quantitative analysis (meta-analysis) could not be performed due to heterogeneity of the studies.
  
  
  CONCLUSIONS
  Conversion rates were slightly higher in PAOS groups, although not statistical significant in most studies. History of PAOS did not implicate in higher morbidity rates.
authors.affiliation: Marleny Novaes Figueiredo, Department of Gastroenterology, University of São Paulo Medical School, São Paulo 01246-904, Brazil.
authors.forename: Marleny Novaes
authors.initials: MN
authors.lastname: Figueiredo
authors.affiliation: Marleny Novaes Figueiredo, Department of Gastroenterology, University of São Paulo Medical School, São Paulo 01246-904, Brazil.
authors.forename: Fabio Guilherme
authors.initials: FG
authors.lastname: Campos
authors.affiliation: Marleny Novaes Figueiredo, Department of Gastroenterology, University of São Paulo Medical School, São Paulo 01246-904, Brazil.
authors.forename: Luiz Augusto
authors.initials: LA
authors.lastname: D'Albuquerque
authors.affiliation: Marleny Novaes Figueiredo, Department of Gastroenterology, University of São Paulo Medical School, São Paulo 01246-904, Brazil.
authors.forename: Sergio Carlos
authors.initials: SC
authors.lastname: Nahas
authors.affiliation: Marleny Novaes Figueiredo, Department of Gastroenterology, University of São Paulo Medical School, São Paulo 01246-904, Brazil.
authors.forename: Ivan
authors.initials: I
authors.lastname: Cecconello
authors.affiliation: Marleny Novaes Figueiredo, Department of Gastroenterology, University of São Paulo Medical School, São Paulo 01246-904, Brazil.
authors.forename: Yves
authors.initials: Y
authors.lastname: Panis
keywords: Colorectal surgery; Laparoscopic surgery; Laparoscopy; Previous abdominal surgery