title: Evacuation proctography: an investigation of rectal expulsion in 20 subjects without defecatory disturbance.
abstract: Evacuation proctography is a dynamic investigation of rectal expulsion that records the voluntary evacuation of thick barium paste on videotape. Evacuation is a passive phenomenon in a defined zone of the rectum, associated with pelvic floor descent of 3 cm from a resting position of the anorectal junction less than 2 cm above the plane of the ischial tuberosities. The anal canal does not open immediately; it takes about 4.5 sec to open to a maximum diameter of 1.5 cm, with rectal emptying in 11 sec. Anterior rectoceles commonly invert over the anal canal as the rectum collapses in at the end of evacuation.
authors.affiliation: Department of Radiology, St. Mark's Hospital, London, England.
authors.forename: C I
authors.initials: CI
authors.lastname: Bartram
authors.forename: G K
authors.initials: GK
authors.lastname: Turnbull
authors.forename: J E
authors.initials: JE
authors.lastname: Lennard-Jones
mesh_terms: D003672:Defecation; D005260:Female; D006801:Humans; D008297:Male; D011859:Radiography; D012007:Rectum / Q000000981:diagnostic imaging* / Q000502:physiology