title: Technological improvements in the treatment of haemorrhoids and obstructed defaecation syndrome.
abstract: BACKGROUND
  An evolution of CPH34 (CPH34 HV) for stapled transanal rectal resections was developed and tested to assess its safety and resection volume as compared to other staplers.
  
  
  METHODS
  A total of 16 pigs were randomly assigned to rectal prolapsectomy with CPH34 HV (n=4), CPH34 (n=4), PPH03-33 (n=4), HEEA (n=2) and PPH-01 (n=2). Measures and histological structure of specimens were assessed; transrectal echotomography (ETG) was performed on the third postoperative day, hence pigs were autopsied.
  
  
  RESULTS
  Significant differences of the volumes and weights of specimens were observed by type of stapler (p=0.0298 and p=0.0278, respectively) which were mainly due to CPH34 HV vs. PPH03-33 (p=0.0402 and p=0.0375, respectively). The average volumes were 17.1% lower for CPH34, 30.2% lower for HEEA, and 34.7% lower for PPH03-33 with respect to CPH34 HV. No significant increase of resection volume (7.5%) was observed between two PPH-01 units combined (two specimens together) vs. a single CPH34 HV unit. The highest percentage of muscularis propria was observed into the specimens collected with CPH34 HV and HEEA (50%). ETG detected three intra- and two extraparietal haematomata.
  
  
  CONCLUSIONS
  The safety and higher volume of resection achievable with CPH34 HV correlated well with the specimen weight and percentage of muscularis propria.
authors.affiliation: U.O.C. General Surgery, Colorectal Unit, San Martino Hospital, L.go R. Benzi, 10 - 16132 Genoa, Italy.
authors.forename: Giuliano
authors.initials: G
authors.lastname: Reboa
authors.forename: Marco
authors.initials: M
authors.lastname: Gipponi
authors.forename: Tommaso
authors.initials: T
authors.lastname: Testa
authors.forename: Francesca
authors.initials: F
authors.lastname: Lantieri
mesh_terms: D000818:Animals; D003248:Constipation / Q000209:etiology / Q000601:surgery*; D003672:Defecation; D006484:Hemorrhoids / Q000150:complications / Q000601:surgery*; D012005:Rectal Prolapse / Q000150:complications / Q000601:surgery*; D017792:Surgical Stapling / Q000295:instrumentation*; D013552:Swine; D013577:Syndrome