Tonic responses of canine proximal colon: Effects of eating, nutrients, and simulated diarrhea

G. Basilisco, S. F. Phillips, J. J. Cullen, M. Chiravuri

Research output: Contribution to journalArticlepeer-review


Our hypothesis was that the proximal colon relaxes to accommodate flow from the ileum. Therefore, we recorded tonic responses of the canine proximal colon to flow through the ileum and colon stimulated by 1) an 840-kcal meal, 2) nutrients perfused into the ileum and colon, or 3) rapid infusion of saline into the ileum with overflow into the colon. Saline infusion was considered to be a model of diarrhea, and the effects of an antidiarrheal (morphine sulfate) were therefore assessed. Proximal colonic tone was measured with 3 barostat. Tone increased before and after the arrival of chyme in the ileocolonic region. Perfusion of nutrients into the ileum and colon also significantly increased (P <0.05) colonic tone compared with equal volumes of saline. Rapid perfusion of the ileocolonic segment with saline increased colonic tone; this increase was significantly greater (P <0.01) when preceded by morphine. In contrast to our hypothesis, tone of the canine proximal colon increased in response to ileal flow. The increase in colonic tone during the late response to food was at least partly attributable to stimulation by intraluminal contents.

Original languageEnglish
JournalAmerican Journal of Physiology - Gastrointestinal and Liver Physiology
Issue number1 31-1
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Physiology
  • Gastroenterology
  • Agricultural and Biological Sciences(all)


Dive into the research topics of 'Tonic responses of canine proximal colon: Effects of eating, nutrients, and simulated diarrhea'. Together they form a unique fingerprint.

Cite this