title: Influence of rectal gel volume on defecation during dynamic pelvic floor magnetic resonance imaging.
abstract: OBJECTIVE
  To evaluate effects of altering rectal contrast volume on defecatory effort during magnetic resonance defecography (MRD).
  
  
  METHODS
  We assessed defecation qualitatively and quantitatively as a function of rectal distention (group A: 180 cc, n=31; group B: 120 cc, n=31). Quantitative evaluation comprised measuring rectal area on midline sagittal images pre- and post-defecation.
  
  
  RESULTS
  Resting rectal area was significantly higher for group A than for group B (35.2 vs. 28.3 cm(2), P<.0001). Post-defecation rectal area and change in area (pre- to post-defecation) were not significantly different. Subjective evaluation showed no significant difference.
  
  
  CONCLUSIONS
  Decreasing rectal gel volume from 180 to 120 cc did not compromise defecation performance during MRD.
authors.affiliation: Department of Radiology, University of Texas Southwestern Medical Center, 2201 Inwood Road, Dallas, TX 75390-9085, United States. Electronic address: gaurav.khatri@utsouthwestern.edu.
authors.forename: Gaurav
authors.initials: G
authors.lastname: Khatri
authors.affiliation: Department of Radiology, University of Texas Southwestern Medical Center, 2201 Inwood Road, Dallas, TX 75390-9085, United States. Electronic address: april.bailey2@utsouthwestern.edu.
authors.forename: April A
authors.initials: AA
authors.lastname: Bailey
authors.affiliation: Department of Urology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9110, United States. Electronic address: cd_bacsu@yahoo.ca.
authors.forename: Chasta
authors.initials: C
authors.lastname: Bacsu
authors.affiliation: Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX, 75390-8851, United States. Electronic address: alana.christie@utsouthwestern.edu.
authors.forename: Alana L
authors.initials: AL
authors.lastname: Christie
authors.affiliation: Department of Radiology, University of Texas Southwestern Medical Center, 2201 Inwood Road, Dallas, TX 75390-9085, United States. Electronic address: neil.kumar@phhs.org.
authors.forename: Neil
authors.initials: N
authors.lastname: Kumar
authors.affiliation: Department of Radiology, University of Texas Southwestern Medical Center, 2201 Inwood Road, Dallas, TX 75390-9085, United States; Advanced Imaging Reseach Center, University of Texas Southwestern Medical Center, 2201 Inwood Road, Dallas, TX 75390-8568, United States. Electronic address: ivan.pedrosa@utsouthwestern.edu.
authors.forename: Ivan
authors.initials: I
authors.lastname: Pedrosa
authors.affiliation: Department of Urology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9110, United States. Electronic address: philippe.zimmern@utsouthwestern.edu.
authors.forename: Philippe
authors.initials: P
authors.lastname: Zimmern
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003672:Defecation / Q000502:physiology*; D019841:Defecography / Q000379:methods*; D005260:Female; D005782:Gels; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D017773:Pelvic Floor / Q000473:pathology*
chemical_list: D005782:Gels
keywords: Dynamic pelvic MRI; MR defecography; Pelvic organ prolapse; Rectal contrast; Rectal gel