title: [Significance of rectal contractions during multichannel urodynamic study].
abstract: BACKGROUND
  The influence of rectal contractions on urination was examined using multichannel urodynamic study.
  
  
  METHODS
  We reviewed a total of 246 consecutive urodynamic studies. Each study consisted of a uroflow measurement and multi-channel urodynamic study, evaluating total vesical pressure, abdominal (rectal) pressure, subtracted detrusor pressure and perianal electromyography. Rectal contractions were defined as periodic fluctuations over 5 cmH2O in abdominal pressure detected by a rectal balloon catheter. No relationship of these contractions with cough and breathing was observed.
  
  
  RESULTS
  Of the 246 patients, 17 (6.9%) had a positive study for rectal contractions. The patients, who had positive rectal contractions, averaged 70-year-old were older than negative subjects averaged 62-year-old. In multichannel urodynamics, the flow rate was significantly decreased, and electromyographic activity was increased at the moment of each rectal contractions.
  
  
  CONCLUSIONS
  The rectal contractions are not artifactual and may be regarded as one of causes responsible for urinary difficulty in the elderly.
authors.affiliation: Department of Urology, Okayama University Medical School.
authors.forename: H
authors.initials: H
authors.lastname: Ozawa
authors.forename: A
authors.initials: A
authors.lastname: Nagai
authors.forename: H
authors.initials: H
authors.lastname: Akiyama
authors.forename: T
authors.initials: T
authors.lastname: Ichikawa
authors.forename: M
authors.initials: M
authors.lastname: Akiyama
authors.forename: N
authors.initials: N
authors.lastname: Ono
authors.forename: T
authors.initials: T
authors.lastname: Oeda
authors.forename: H
authors.initials: H
authors.lastname: Kumon
authors.forename: H
authors.initials: H
authors.lastname: Ohmori
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008365:Manometry; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology*; D011312:Pressure; D012007:Rectum / Q000502:physiology*; D014554:Urination; D014563:Urodynamics / Q000502:physiology*