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Gallbladder emptying response to sham feeding in humans
Gastroenterology
|June 1, 1986
Summary
Gallbladder emptying response to sham feeding requires intact vagus nerves and cholinergic pathways. This response is comparable to direct cholinergic stimulation but is blocked by atropine.
Area of Science:
- Gastroenterology
- Physiology
- Nuclear Medicine
Background:
- Gallbladder emptying is regulated by complex neural and hormonal pathways.
- The role of vagal nerve stimulation in gallbladder function, particularly in response to cephalic phase stimuli, requires further elucidation.
Purpose of the Study:
- To investigate the gallbladder emptying response to sham feeding.
- To compare sham feeding response with direct cholinergic stimulation and meal ingestion.
- To determine the role of cholinergic pathways and vagus nerves in sham feeding-induced gallbladder emptying.
Main Methods:
- Cholescintigraphy using 99mTc-HIDA was performed.
- Gallbladder emptying was assessed following sham feeding of a steak and potato meal.
- Responses were compared to direct cholinergic stimulation (bethanechol) and meal ingestion.
- Effects of cholinergic blockade (atropine) and vagotomy were evaluated.
Main Results:
- Maximal gallbladder emptying after sham feeding was 44.1% ± 10.1%.
- This response was not significantly different from bethanechol stimulation.
- Atropine abolished the sham feeding response.
- Sham feeding did not stimulate gallbladder emptying in vagotomized patients.
Conclusions:
- Intact vagus nerves and cholinergic pathways are essential for gallbladder response to sham feeding.
- The cephalic phase of digestion significantly influences gallbladder emptying via the vagal-cholinergic system.
- Further research is needed to fully understand the precise mechanisms involved.
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