title: Colonic regular contractile frequency patterns in irritable bowel syndrome: the 'spastic colon' revisited.
abstract: BACKGROUND
  Irritable bowel syndrome is a frequent gastrointestinal disorder of which the pathophysiological basis is still not completely understood. Among the various proposed mechanisms, colonic motility may play a role, at least in a subset of patients.
  
  
  OBJECTIVE
  To investigate the regular colonic contractile patterns in patients with irritable bowel syndrome. Our working hypothesis was that an increase of these patterns in such condition might represent a motility equivalent of the so-called 'spastic colon'.
  
  
  METHODS
  Twelve patients of both genders were investigated by means of 24 h colonic manometry, and the results were compared to those from 20 healthy controls. Regular contractile patterns (with frequencies ranging from 2 to 8 per min) were calculated for the entire recording period and in single colonic segments.
  
  
  RESULTS
  Overall, colonic frequency patterns were significantly more frequent in patients than controls (12.6% vs 6.4% of the total contractile activity, P < 0.001); in both groups, the 3 cycles/min frequency was predominant, especially in the sigmoid colon. More than 40% patients displayed a correlation between abdominal pain and occurrence of regular contractile frequencies.
  
  
  CONCLUSIONS
  Abnormal colonic motility may play some role in the pathogenesis of symptoms related to irritable bowel syndrome, with an excess of regular contractile activity related to the so-called 'spastic colon'.
authors.affiliation: Gastrointestinal and Hepatology Section, Department of Clinical and Experimental Medicine, University of Perugia, Italy.
authors.forename: Gabrio
authors.initials: G
authors.lastname: Bassotti
authors.forename: Francis
authors.initials: F
authors.lastname: Sietchiping-Nzepa
authors.forename: Giuseppe
authors.initials: G
authors.lastname: De Roberto
authors.forename: Fabio
authors.initials: F
authors.lastname: Chistolini
authors.forename: Antonio
authors.initials: A
authors.lastname: Morelli
mesh_terms: D000328:Adult; D000368:Aged; D002940:Circadian Rhythm; D003106:Colon / Q000503:physiopathology*; D003109:Colonic Diseases, Functional / Q000503:physiopathology*; D005260:Female; D005769:Gastrointestinal Motility; D006801:Humans; D008297:Male; D008365:Manometry / Q000379:methods; D008875:Middle Aged