Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/100139
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Type: Journal article
Title: Neurally mediated propagating discrete clustered contractions superimposed on myogenic ripples in ex vivo segments of human ileum
Author: Kuizenga, M.
Sia, T.
Dodds, K.
Wiklendt, L.
Arkwright, J.
Thomas, A.
Brookes, S.
Spencer, N.
Wattchow, D.
Dinning, P.
Costa, M.
Citation: American Journal of Physiology: Gastrointestinal and Liver Physiology, 2015; 308(1):G1-G11
Publisher: American Physiological Society
Issue Date: 2015
ISSN: 0193-1857
1522-1547
Statement of
Responsibility: 
Merel H. Kuizenga, Tiong C. Sia, Kelsi N. Dodds, Lukasz Wiklendt, John W. Arkwright, A. Thomas, Simon J. Brookes, Nick J. Spencer, David A. Wattchow, Phil G. Dinning, and Marcello Costa
Abstract: Narrow muscle strips have been extensively used to study intestinal contractility. Larger specimens from laboratory animals have provided detailed understanding of mechanisms that underlie patterned intestinal motility. Despite progress in animal tissue, investigations of motor patterns in large, intact specimens of human gut ex vivo have been sparse. In this study, we tested whether neurally dependent motor patterns could be detected in isolated specimens of intact human ileum. Specimens (n = 14; 7-30 cm long) of terminal ileum were obtained with prior informed consent from patients undergoing colonic surgery for removal of carcinomas. Preparations were set up in an organ bath with an array of force transducers, a fiberoptic manometry catheter, and a video camera. Spontaneous and distension-evoked motor activity was recorded, and the effects of lidocaine, which inhibits neural activity, were studied. Myogenic contractions (ripples) occurred in all preparations (6.17 ± 0.36/min). They were of low amplitude and formed complex patterns by colliding and propagating in both directions along the specimen at anterograde velocities of 4.1 ± 0.3 mm/s and retrogradely at 4.9 ± 0.6 mm/s. In five specimens, larger amplitude clusters of contractions were seen (discrete clustered contractions), which propagated aborally at 1.05 ± 0.13 mm/s and orally at 1.07 ± 0.09 mm/s. These consisted of two to eight phasic contractions that aligned with ripples. These motor patterns were abolished by addition of lidocaine (0.3 mM). The ripples continued unchanged in the presence of this neural blocking agent. These results demonstrate that both myogenic and neurogenic motor patterns can be studied in isolated specimens of human small intestine.
Keywords: Small intestine; motor patterns; enteric nervous system; myogenic; neurogenic
Rights: Copyright © 2015 the American Physiological Society
RMID: 0030026492
DOI: 10.1152/ajpgi.00230.2014
Grant ID: http://purl.org/au-research/grants/nhmrc/1064835
Appears in Collections:Medical Sciences publications

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