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Cholinergic effects on gallbladder emptying in humans.

R S Fisher, E Rock, L S Malmud

    Gastroenterology
    |October 1, 1985
    PubMed
    Summary
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    Cholinergic mechanisms play a key role in gallbladder emptying. Blocking these pathways with atropine sulfate reduced gallbladder emptying, while stimulation with bethanechol increased it.

    Area of Science:

    • Gastroenterology
    • Neurogastroenterology
    • Physiology

    Background:

    • The precise role of cholinergic pathways in human gallbladder emptying remains unclear.
    • Understanding these mechanisms is crucial for diagnosing and treating gallbladder motility disorders.

    Purpose of the Study:

    • To investigate the influence of cholinergic stimulation and blockade on gallbladder emptying in humans.
    • To assess gallbladder function in patients with vagotomies.

    Main Methods:

    • Utilized scintigraphy with technetium-99m-labeled iminodiacetic acid derivatives and indium-111-labeled diethylenetriamine pentaacetic acid to assess gallbladder and stomach emptying, respectively.
    • Studied 43 healthy subjects and 18 patients post-vagotomy.
    • Administered bethanechol for cholinergic stimulation and atropine sulfate for blockade.

    Related Experiment Videos

  • Evaluated responses to liquid meals, solid meals, and cholecystokinin-octapeptide infusion.

    • Main Results:

    • Direct cholinergic stimulation with bethanechol significantly enhanced gallbladder emptying.
    • Cholinergic blockade with atropine sulfate diminished gallbladder emptying in response to various stimuli.
    • Patients with vagotomies exhibited reduced gallbladder emptying, even with accelerated gastric emptying.
    • Gallbladder emptying response to cholecystokinin-octapeptide was enhanced in vagotomized patients.

    Conclusions:

    • Cholinergic receptors are likely integral to the regulation of human gallbladder emptying.
    • Vagotomy alters gallbladder emptying dynamics, suggesting a significant role for vagal cholinergic input.
    • Further research into cholinergic modulation could offer therapeutic targets for gallbladder dysfunction.