Document Detail


Abnormal predefecatory colonic motor patterns define constipation in obstructed defecation.
MedLine Citation:
PMID:  15236171     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND & AIMS: The pathophysiology of constipation in the syndrome of obstructed defecation is unknown. Using 24-hour pancolonic manometric recordings of the unprepared colon to record basal pressures and spontaneous defecation episodes, we tested the hypothesis that the frequency, timing, or spatial distribution of propagating colonic pressure waves is abnormal in patients with obstructed defecation. METHODS: In 11 patients with obstructed defecation and 16 healthy controls, pressures were recorded using a nasocolonic catheter that was positioned such that 16 recording sites spanned the unprepared colon at 7.5-cm intervals. RESULTS: The overall frequency of propagating sequences (PS) in the colon did not differ between patients and controls. When compared with controls, patients had a significant increase in the frequency of retrograde and antegrade PS (P < 0.05) in the left colon and a significant reduction in the amplitude of propagating pressure waves throughout the entire colon (P < 0.03). Defecation occurred in 6 of 11 patients and 9 of 16 controls. In the 15 minutes before defecation, controls showed a highly significant increase in frequency (P = 0.001) and amplitude (P = 0.01) of PS. In contrast, patients did not demonstrate this or the typical spatiotemporal organization of PS normally observed before expulsion of stool. CONCLUSIONS: Patients with obstructed defecation lack the normal predefecatory augmentation in frequency and amplitude of propagating pressure waves and lack the normal stereotypic spatiotemporal patterning of colonic pressure waves that would normally culminate in effective expulsion of stool.
Authors:
Philip G Dinning; Peter A Bampton; Julie Andre; Michael L Kennedy; David Z Lubowski; Denis W King; Ian J Cook
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Gastroenterology     Volume:  127     ISSN:  0016-5085     ISO Abbreviation:  Gastroenterology     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2004-07-05     Completed Date:  2004-09-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374630     Medline TA:  Gastroenterology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  49-56     Citation Subset:  AIM; IM    
Affiliation:
Department of Gastroenterology, The St. George Hospital, University of New South Wales, Kogarah, New South Wales, Australia.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Colonic Diseases, Functional / physiopathology*
Constipation / physiopathology*
Defecation / physiology*
Defecography
Female
Gastrointestinal Motility / physiology*
Humans
Male
Manometry
Middle Aged

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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