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Acid absorption in the canine duodenum

H S Himal, J L Werther, M L Chapman

    Annals of Surgery
    |April 1, 1977
    PubMed
    Summary
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    The canine duodenum actively transports hydrogen ions (H+), influencing intraluminal pH. This duodenal mucosal activity is significant in acid-base balance and may impact ulcer vulnerability.

    Area of Science:

    • Gastroenterology
    • Physiology
    • Acid-Base Balance

    Background:

    • The duodenum neutralizes gastric acid via pancreatic juice and bile.
    • The role of duodenal mucosa in direct acid management is less understood.

    Purpose of the Study:

    • To investigate the duodenal mucosa's capacity to modify instilled acid solutions.
    • To quantify ionic shifts across proximal and distal duodenal segments.

    Main Methods:

    • Exteriorized canine duodenal segments were exposed to varying concentrations of hydrochloric acid (HCl).
    • Solutions were analyzed for volume, electrolytes (Na+, K+), protein, and osmolality after 15 minutes.
    • Ionic movement rates were compared between duodenal segments, antrum, and fundus.

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    Main Results:

    • Both proximal and distal duodenal mucosa demonstrated a loss of H+ and a gain of Na+ and K+.
    • These ionic shifts occurred at rates independent of the initial acid concentration.
    • Duodenal ionic transport rates were significantly higher than those in the antrum and fundus.
    • Calculated H+ loss suggested transmucosal insorption, contributing to intraluminal pH regulation.

    Conclusions:

    • The duodenal mucosa actively participates in regulating intraluminal pH through ion transport.
    • This transmucosal H+ loss is a crucial factor in maintaining duodenal acid-base homeostasis.
    • Duodenal mucosal permeability to H+ may be linked to the susceptibility to acid-peptic ulcer disease.