title: Randomized, blinded comparison of transgastric, transcolonic, and laparoscopic peritoneoscopy for the detection of peritoneal metastases in a human cadaver model.
abstract: BACKGROUND
  Natural orifice transluminal endoscopic surgery peritoneoscopy may be able to replace laparoscopic peritoneoscopy (LAP) for staging of GI malignancies if it is proven to be equally accurate and safe.
  
  
  OBJECTIVE
  To compare transgastric peritoneoscopy (TGP) and transcolonic peritoneoscopy (TCP) to LAP, pairwise, in a randomized, blinded (to location and number of beads) human cadaver model with simulated peritoneal metastases.
  
  
  METHODS
  Metastases were simulated by 2.5-mm, color-coded beads, which were placed into the peritoneal cavity via an open approach. In previous porcine experiments, LAP resulted in a yield of 95%. By using a noninferiority design with a margin of equivalence of 15%, we needed a sample size of 34 beads for 80% power. Randomization was performed for number and location of beads. Eighteen experiments were performed on 6 fresh-frozen human cadavers.
  
  
  METHODS
  Experimental surgical laboratory.
  
  
  METHODS
  LAP, TGP, and TCP were performed in randomized order by one of two surgeons/endoscopists blinded for location and number of beads.
  
  
  METHODS
  Number of beads detected and touched.
  
  
  RESULTS
  LAP found and touched 33 beads (yield 97%), TGP 26 beads (76%; difference in yield vs LAP was -20.5 [95% CI, -26.3 to -9.27]), and TCP 29 beads (85%; difference in yield vs LAP was -11.8 [95% CI, -14.6 to 4.98]). Beads that were missed were mostly located at the inferior liver surface: TGP missed 6 of 9 of these beads (67%), TCP 4 of 9 (44%).
  
  
  CONCLUSIONS
  Cadaver model.
  
  
  CONCLUSIONS
  In this prospective, blinded, comparative trial in a human cadaver model, TCP was comparable to LAP in detecting simulated metastases. TGP was inferior to LAP. Future development should focus on improved visualization of the inferior surface of the liver.
authors.affiliation: Department of Gastroenterology and Hepatology, Academic Medical Center, University of Amsterdam, The Netherlands.
authors.forename: Rogier P
authors.initials: RP
authors.lastname: Voermans
authors.forename: Mark I
authors.initials: MI
authors.lastname: van Berge Henegouwen
authors.forename: Erienne
authors.initials: E
authors.lastname: de Cuba
authors.forename: Frank J C
authors.initials: FJ
authors.lastname: van den Broek
authors.forename: Gijs
authors.initials: G
authors.lastname: van Acker
authors.forename: Robin
authors.initials: R
authors.lastname: Timmer
authors.forename: Paul
authors.initials: P
authors.lastname: Fockens
mesh_terms: D002102:Cadaver; D005260:Female; D006801:Humans; D010535:Laparoscopy / Q000379:methods*; D008297:Male; D008954:Models, Biological; D057605:Natural Orifice Endoscopic Surgery; D010534:Peritoneal Neoplasms / Q000175:diagnosis* / Q000556:secondary*; D011897:Random Allocation; D015203:Reproducibility of Results; D016037:Single-Blind Method