Document Detail

Characterization of motor patterns in isolated human colon: are there differences in patients with slow-transit constipation?
MedLine Citation:
PMID:  21960519     Owner:  NLM     Status:  MEDLINE    
The patterns of motor activity that exist in isolated full-length human colon have not been described. Our aim was to characterize the spontaneous motor patterns in isolated human colon and determine whether these patterns are different in whole colons obtained from patients with slow-transit constipation (STC). The entire colon (excluding the anus), was removed from patients with confirmed STC and mounted longitudinally in an organ bath ∼120 cm in length, containing oxygenated Krebs' solution at 36°C. Changes in circular muscle tension were recorded from multiple sites simultaneously along the length of colon, by use of isometric force transducers. Recordings from isolated colons from non-STC patients revealed cyclical colonic motor complexes (CMCs) in 11 of 17 colons, with a mean interval and half-duration of contractions of 4.0 ± 0.6 min and 51.5 ± 15 s, respectively. In the remaining six colons, spontaneous irregular phasic contractions occurred without CMCs. Interestingly, in STC patients robust CMCs were still recorded, although their CMC pacemaker frequencies were slower. Intraluminal balloon distension of the ascending or descending colon evoked an ascending excitatory reflex contraction, or evoked CMC, in 8 of 30 trials from non-STC (control) colons, but not from colons obtained from STC patients. In many control segments of descending colon, spontaneous CMCs consisted of simultaneous ascending excitatory and descending inhibitory phases. In summary, CMCs can be recorded from isolated human colon, in vitro, but their intrinsic pacemaker frequency is considerably faster in vitro compared with previous human recordings of CMCs in vivo. The observation that CMCs occur in whole colons removed from STC patients suggests that the intrinsic pacemaker mechanisms underlying their generation and propagation are preserved in vitro, despite impaired transit along these same regions in vivo.
Nick J Spencer; Melinda Kyloh; David A Wattchow; Anthony Thomas; Tiong Cheng Sia; Simon J Brookes; Sarah J Nicholas
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-09-29
Journal Detail:
Title:  American journal of physiology. Gastrointestinal and liver physiology     Volume:  302     ISSN:  1522-1547     ISO Abbreviation:  Am. J. Physiol. Gastrointest. Liver Physiol.     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2011-12-20     Completed Date:  2012-02-16     Revised Date:  2012-05-23    
Medline Journal Info:
Nlm Unique ID:  100901227     Medline TA:  Am J Physiol Gastrointest Liver Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  G34-43     Citation Subset:  IM    
Dept. of Human Physiology, School of Medicine, Flinders Univ., South Australia, Australia.
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MeSH Terms
Colon / physiology*,  surgery
Constipation / physiopathology*
Middle Aged
Muscle Tonus / physiology
Muscle, Smooth / physiology
Organ Culture Techniques
Severity of Illness Index

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