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Related Experiment Videos

Postprandial changes in intestinal slow-wave propagation reflect a decrease in cell coupling.

D Terasaka1, A Bortoff, L F Sillin

  • 1Department of Physiology, State University of New York Health Science Center, Syracuse.

The American Journal of Physiology
|September 1, 1989
PubMed
Summary
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Feeding significantly slows jejunal slow-wave propagation velocity (SWPV) in cats, likely due to increased internal resistance from uncoupled intestinal muscle cells. This effect, observed after meals, suggests a persistent postprandial factor.

Area of Science:

  • Gastroenterology
  • Physiology
  • Electrophysiology

Background:

  • Jejunal slow-wave propagation velocity (SWPV) is crucial for gastrointestinal motility.
  • Understanding how feeding affects SWPV is important for diagnosing motility disorders.

Purpose of the Study:

  • To investigate the impact of feeding on jejunal slow-wave propagation velocity (SWPV) in a feline model.
  • To elucidate the underlying mechanisms responsible for any observed changes in SWPV postprandially.

Main Methods:

  • Nine cats were surgically implanted with electrodes along the jejunum to record electrical activity.
  • Electrical activity was monitored during an 18-hour fast and for several hours after feeding.
  • Jejunal slow-wave propagation velocity (SWPV) and slow-wave frequency (SWF) were calculated and analyzed.

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Main Results:

  • Average SWPV significantly decreased postprandially, from a fasting level of 2.28 cm/s to 1.37 cm/s at 3 hours.
  • No significant changes were observed in SW amplitude, maximum depolarization rate, or threshold.
  • The relationship between SWPV and SWF showed a decreased slope postprandially, indicating increased internal resistance.

Conclusions:

  • Feeding causes a rapid and prolonged decrease in jejunal SWPV in cats.
  • The findings suggest that uncoupling of intestinal muscle cells, leading to increased internal resistance, is the primary mechanism behind the reduced SWPV.
  • A postprandial factor released during meal ingestion likely mediates this effect, persisting for several hours.