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Pentagastrin and gastric mucosal blood flow
The American Journal of Physiology
|May 1, 1986
Summary
Pentagastrin increases gastric mucosal blood flow in rats. Direct microvascular measurements and laser-Doppler flowmetry showed moderate increases, unlike aminopyrine clearance which overestimated blood flow changes.
Area of Science:
- Gastroenterology
- Physiology
- Microcirculation Research
Background:
- Pentagastrin stimulates gastric acid secretion.
- Understanding its impact on mucosal microcirculation is crucial for gastric physiology.
Purpose of the Study:
- To investigate the effects of pentagastrin on rat gastric mucosal blood flow.
- To compare different methods for measuring blood flow changes during pentagastrin infusion.
Main Methods:
- Intravital microscopy was used to measure red blood cell velocity and vessel diameter in superficial mucosal vessels.
- Blood flow (QRBC) was calculated from these parameters.
- Comparisons were made with aminopyrine (AP) clearance and laser-Doppler flowmetry (LDF).
Main Results:
- Intravenous pentagastrin infusion increased QRBC by 47% at submaximal doses and 36% at maximal doses.
- [14C]AP clearance showed a significantly higher increase (309%) in gastric mucosal blood flow compared to QRBC (34%).
- LDF measurements showed a similar increase (41%) to QRBC (50%) during pentagastrin infusion.
Conclusions:
- Pentagastrin significantly increases gastric mucosal blood flow in rats.
- Aminopyrine clearance may overestimate blood flow changes in the gastric mucosa compared to direct microvascular measurements and LDF.
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