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The influence of Dopamine on microcirculation during hemorrhagic shock was investigated by means of the pancreas chamber technique (HEISIG, 1967). Parameter of microcirculation was the corpuscular flow velocity measured with the "flying spot" method. Simultaneously arterial and venous blood pressure, heart rate, blood gases and pH-status were registered. While a Dopamine-dosage of 5 mug/kg/min did not markedly effect perfusion of the pancreas, application of 10 as well as 20 mug/kg/min Dopamine caused a significant improvement of microcirculation. There was no difference between 10 and 20 mug/kg/min Dopamine. The increase of capillary perfusion can certainly not be explained by the small rise of blood pressure that was found under treatment with Dopamine. The results support the statement of the existence of Dopamine-specific receptors in pancreatic vessels. Compared to a group of animals treated with 5 mug/kg/min Dopamine and an untreated control group, survival rate of animals treated with 10 as well as 20 mug/kg/min Dopamine was significantly increased.
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