title: Preoperative prediction of conversion from laparoscopic rectal resection to open surgery: a clinical study of conversion scoring of laparoscopic rectal resection to open surgery.
abstract: OBJECTIVE
  The objectives of this paper were to establish a model for the conversion of laparoscopic rectal resection to open surgery and to predict possible conversion before surgery.
  
  
  METHODS
  The clinical data of 602 cases of laparoscopic rectal resection were retrospectively assessed. Risk factors associated with conversion of laparoscopic rectal resection to open rectal surgery were identified by logistic regression analysis. Also, a scoring system was created to calculate a score for the conversion of laparoscopic rectal resection to predict possible conversion for patients who underwent laparoscopic rectal resection before surgery.
  
  
  RESULTS
  A total of 90 patients required conversion (total conversion rate = 14.95%). The established model included six variables: male gender, surgical experience (≤25 cases), history of abdominal surgery, body mass index ≥ 28, tumor diameter ≥ 6 cm, and tumor invasion or metastasis, for which 6, 4, 5, 10, 15, and 21 points were assigned, respectively. A patient with a total score >14.5 points was considered to have a high probability of conversion, whereas a patient with a total score <14.5 points was considered at a low risk.
  
  
  CONCLUSIONS
  Preoperative determination of conversion score may predict possible conversion of laparoscopic rectal resection and thus reduce unnecessary open rectal surgery.
authors.affiliation: Department of General Surgery, Qi Lu Hospital of Shandong University, 107#, Wenhua Xi Road, Jinan City, 250012, China, zhangguangdong001@outlook.com.
authors.forename: Guang-Dong
authors.initials: GD
authors.lastname: Zhang
authors.forename: Xu-Ting
authors.initials: XT
authors.lastname: Zhi
authors.forename: Jian-Li
authors.initials: JL
authors.lastname: Zhang
authors.forename: Guang-Bo
authors.initials: GB
authors.lastname: Bu
authors.forename: Gang
authors.initials: G
authors.lastname: Ma
authors.forename: Kai-Lei
authors.initials: KL
authors.lastname: Wang
mesh_terms: D000005:Abdomen / Q000601:surgery; D000368:Aged; D015992:Body Mass Index; D061887:Conversion to Open Surgery / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D010535:Laparoscopy / Q000009:adverse effects*; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D057234:Preoperative Period; D011336:Probability; D012372:ROC Curve; D012004:Rectal Neoplasms / Q000473:pathology* / Q000601:surgery*; D012189:Retrospective Studies; D012307:Risk Factors; D012737:Sex Factors; D047368:Tumor Burden