Electromyographic, myomechanical, and intraluminal pressure changes associated with acute extraluminal obstruction of the jejunum in conscious ponies.
Abstract: Bipolar electrodes, strain gauge force transducers, intraluminal pressure recording catheters, and extraluminal intestinal obstructors were surgically implanted in 4 ponies to record myoelectrical and mechanical activity of the distal portion of the jejunum and ileum. After determining normal intestinal activity and pressures, the distal portion of the jejunum was obstructed with an extraluminal obstructor. Myoelectrical and mechanical activity recorded from jejunal segments proximal to the obstruction increased significantly (P less than 0.01), whereas activity distal to the obstruction remained unchanged. Intraluminal pressure increases were recorded during periods of intestinal spasm. Obstruction pressures remained unchanged from preobstruction pressures.
Publication Date: 1986-01-01 PubMed ID: 3946911
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- Journal Article
- Research Support
- U.S. Gov't
- Non-P.H.S.
Summary
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This research examined the changes in muscle electrical activity, muscle mechanics, and internal pressure in the jejunum (part of the small intestine) of ponies when an obstruction was artificially induced. It found that muscle activity increased above the obstruction point, while it remained the same below. The increase in pressure was observed during periods of intestinal contractions, but remained the same before and after the obstruction.
Experimental Setup
- The researchers used a variety of tools to conduct this study. Bipolar electrodes, strain gauge force transducers, intraluminal pressure recording catheters, and extraluminal intestinal obstructors were surgically implanted in four ponies.
- The implanted tools allowed them to record the electrical and mechanical activities in the lower part of the ponies’ jejunum and their ileum (the last part of the small intestine).
- The focus of the study was mainly on the changes that occur when the jejunum is obstructed.
Findings and Conclusions
- After determining the normal intestinal activities and pressures without any obstruction, the researchers introduced an obstruction in the lower part of the jejunum using the surgically implanted obstructor.
- The data recorded from this setup showed a significant increase (P < 0.01) in both the electrical and mechanical activities in the sections of the jejunum that are situated before (above) the obstruction point.
- On the other hand, the parts of the jejunum located after (below) the obstruction point did not show any noticeable change in their activity levels.
- In addition to these, the internal pressure of the jejunum also showed some fluctuations. Notable increases in this pressure were only recorded during the periods when intestinal spasms were occurring.
- Interestingly, the pressures recorded at the obstruction points didn’t themselves change from what was recorded when there was no obstruction present.
- Overall, the findings of this study could prove useful in understanding and predicting how the body reacts to different types of intestinal obstructions, specifically in the lower part of the jejunum in horses.
Cite This Article
APA
MacHarg MA, Adams SB, Lamar CH, Becht JL.
(1986).
Electromyographic, myomechanical, and intraluminal pressure changes associated with acute extraluminal obstruction of the jejunum in conscious ponies.
Am J Vet Res, 47(1), 7-11.
Publication
Researcher Affiliations
MeSH Terms
- Animals
- Electromyography
- Gastrointestinal Motility
- Horse Diseases / physiopathology
- Horses
- Intestinal Obstruction / physiopathology
- Intestinal Obstruction / veterinary
- Jejunum / physiopathology
- Muscle, Smooth / physiopathology
- Pressure
Citations
This article has been cited 5 times.- Bracamonte JL, Devick I, Thomas KL, Hendrick S. Comparison of hand-sewn and oversewn stapled jejunojejunal anastomoses in horses. Can Vet J 2018 Jan;59(1):67-73.
- Abo M, Kono T, Wang Z, Chen JD. Intestinointestinal inhibitory reflexes: effect of distension on intestinal slow waves. Dig Dis Sci 2001 Jun;46(6):1177-85.
- Navarre CB, Roussel AJ. Gastrointestinal motility and disease in large animals. J Vet Intern Med 1996 Mar-Apr;10(2):51-9.
- Quigley EM, Thompson JS, Lof J. Disruption of canine jejunal interdigestive myoelectrical activity by artificial ileocolonic sphincter. Studies of intestinal motor response to surgically fashioned sphincter substitute. Dig Dis Sci 1989 Sep;34(9):1434-42.
- Verhaar N, Hammer E, Reineking W, Hewicker-Trautwein M, Geburek F. Ex vivo comparison of full-thickness biopsy techniques in the equine small intestine. Vet Surg 2025 Jan;54(1):208-218.
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