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Dopamine and hepatic oxygen supply-demand relationship.
L Roytblat1, S Gelman, E L Bradley
1Department of Anesthesiology, University of Alabama, Birmingham.
Canadian Journal of Physiology and Pharmacology
|August 1, 1990
Summary
Small doses of dopamine increase hepatic oxygen uptake and delivery in pigs. However, the hepatic oxygen supply-demand ratio did not improve and decreased at higher doses, indicating no benefit.
Area of Science:
- Physiology
- Pharmacology
Background:
- Dopamine is used to manage hemodynamic instability.
- Its effects on hepatic oxygen balance require further investigation.
Purpose of the Study:
- To investigate the impact of low-dose dopamine on the hepatic oxygen supply-uptake ratio.
- To determine if dopamine improves hepatic oxygenation.
Main Methods:
- Thirteen miniature pigs were studied under anesthesia.
- Hepatic blood flow and blood oxygen content were measured.
- Dopamine was infused at escalating doses (5, 10, 15 µg/kg/min).
Main Results:
- Dopamine increased hepatic oxygen uptake in a dose-related manner.
- Hepatic oxygen delivery increased dose-independently, peaking at 10 µg/kg/min.
- The oxygen supply-uptake ratio remained stable at lower doses but decreased significantly at 15 µg/kg/min.
Conclusions:
- Low-dose dopamine increases hepatic oxygen delivery and uptake.
- Despite increased delivery, the hepatic oxygen supply-demand balance does not improve and may worsen at higher doses.