title: Is da Vinci Xi Better than da Vinci Si in Robotic Rectal Cancer Surgery? Comparison of the 2 Generations of da Vinci Systems.
abstract: BACKGROUND
  We aimed to compare perioperative outcomes for procedures using the latest generation of da Vinci robot versus its previous version in rectal cancer surgery.
  
  
  METHODS
  Fifty-three patients undergoing robotic rectal cancer surgery between January 2010 and March 2015 were included. Patients were classified into 2 groups (Xi, n=28 vs. Si, n=25) and perioperative outcomes were analyzed.
  
  
  RESULTS
  The groups had significant differences including operative procedure, hybrid technique and redocking (P>0.05). In univariate analysis, the Xi group had shorter console times (265.7 vs. 317.1 min, P=0.006) and total operative times (321.6 vs. 360.4 min, P=0.04) and higher number of lymph nodes harvested (27.5 vs. 17.0, P=0.008). In multivariate analysis, Xi robot was associated with a shorter console time (odds ratio: 0.09, P=0.004) with no significant differences regarding other outcomes.
  
  
  CONCLUSIONS
  Both generations of da Vinci robot led to similar short-term outcomes in rectal cancer surgery, but the Xi robot allowed shorter console times.
authors.affiliation: *Department of General Surgery, Atakent Hospital †Medical Faculty ‡Department of General Surgery, Maslak Hospital, Acibadem University, Istanbul, Turkey.
authors.forename: Volkan
authors.initials: V
authors.lastname: Ozben
authors.forename: Turgut B
authors.initials: TB
authors.lastname: Cengiz
authors.forename: Deniz
authors.initials: D
authors.lastname: Atasoy
authors.forename: Onur
authors.initials: O
authors.lastname: Bayraktar
authors.forename: Afag
authors.initials: A
authors.lastname: Aghayeva
authors.forename: Ilknur
authors.initials: I
authors.lastname: Erguner
authors.forename: Bilgi
authors.initials: B
authors.lastname: Baca
authors.forename: Ismail
authors.initials: I
authors.lastname: Hamzaoglu
authors.forename: Tayfun
authors.initials: T
authors.lastname: Karahasanoglu
mesh_terms: D016063:Blood Loss, Surgical; D005260:Female; D006801:Humans; D007902:Length of Stay / Q000706:statistics & numerical data; D008197:Lymph Node Excision / Q000379:methods; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology; D012004:Rectal Neoplasms / Q000601:surgery*; D065287:Robotic Surgical Procedures / Q000379:methods / Q000592:standards*; D016896:Treatment Outcome