title: A computerised vector manometry study of the so-called ectopic anus.
abstract: There are several totally different definitions of the so-called ectopic anus. To determine whether computerized eight-channel manometry helps to define the entity of the ectopic anus, ten patients (nine females) were operated upon for an ectopic anus by the anal transposition technique (perineal pull-through procedure). Besides the software-supported manometric data, the qualitative imaging analysis was of interest. We calculated the factor by which the pressure of the three ventrally-located segments was lower than the mean segmental pressure at this part of the anal canal. The results were compared to standard age-related values established in a former study in 100 children. Besides pre- and postoperative manometry, barium roentgenograms were obtained. The anal-canal length at rest in the ectopic anus was significantly (P < 0.0001) longer. The segmental asymmetry index in the lower anal canal (LAC) was increased, but not significantly. The pressure in the ventral segments of the LAC was significantly (P < 0.0001) decreased and was less than one-half of the mean segmental pressure in this zone. We found a significant correlation between the degree of anterior displacement and the factor by which the ventrally-located pressure values were decreased. Postoperatively, this factor increased significantly. From a functional point of view, the definition of the ectopic anus includes a deficient high-pressure zone ventrally in the LAC. The LAC seems to run out or nearly out of the ventral sphincteric issue to end ectopically on the perineal surface.
authors.affiliation: Department of Pediatric Surgery, Dr. v. Haunerschen Kinderspital, Klinikum Innenstadt der Ludwig Maximilians Universität München, Lindwurmstrasse 4, 80337 München, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Schuster
authors.forename: I
authors.initials: I
authors.lastname: Joppich
authors.forename: K
authors.initials: K
authors.lastname: Schneider
authors.forename: G
authors.initials: G
authors.lastname: Jobst
mesh_terms: D000367:Age Factors; D001003:Anal Canal / Q000002:abnormalities / Q000503:physiopathology* / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007223:Infant; D008297:Male; D008365:Manometry / Q000379:methods*; D011312:Pressure; D012007:Rectum / Q000002:abnormalities / Q000503:physiopathology