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Interdigestive migrating contraction in short bowel dogs

S Takeuchi, I Aizawa, R Takayanagi

    Gastroenterologia Japonica
    |January 1, 1980
    PubMed
    Summary
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    The lower gut does not significantly impact the stomach's periodic interdigestive migrating contractions (IMC). Removing or isolating the lower small bowel did not alter the regular timing of these gastrointestinal motility waves.

    Area of Science:

    • Gastroenterology
    • Physiology

    Background:

    • Interdigestive migrating contractions (IMC) are periodic waves of gastrointestinal motility.
    • The role of the lower small bowel in regulating the periodicity of IMC originating in the stomach is not fully understood.

    Purpose of the Study:

    • To investigate the effect of isolating or resecting the lower third of the small intestine on the periodic occurrence of IMC in the stomach.
    • To determine if the lower gut influences the timing and propagation of IMC.

    Main Methods:

    • Extraluminal force transducers were implanted on the canine gastrointestinal tract (antrum, upper jejunum, mid intestine, terminal ileum).
    • Interdigestive migrating contractions (IMC) were recorded in conscious dogs before and after creating a Thiry loop (isolation) or removing (resection) the lower third of the small bowel.

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  • Key parameters measured included time to first IMC post-feeding, interval between IMC terminations, IMC migrating time, and IMC duration in the stomach.

    • Main Results:

    • The time interval between the termination of successive IMC in the stomach remained constant across all experimental conditions.
    • A slight shortening of IMC migrating time from the stomach to the terminal ileum was observed in the isolation and resection groups.
    • The periodic occurrence of IMC in the stomach was not significantly affected by the presence or absence of the lower gut.

    Conclusions:

    • The lower gut does not exert a significant influence on the regular, periodic initiation of IMC in the stomach.
    • While minor alterations in migrating time were noted, the overall timing of the gastric IMC cycle is independent of the distal small bowel.