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Adenosine and hemodynamic alterations in cirrhotic rats
B Champigneulle1, A Braillon, G Kleber
1Laboratoire d'Hémodynamique Splanchnique, Institut National de la Santé et de la Recherche Médicale Unité 24, Clichy, France.
The American Journal of Physiology
|April 1, 1991
Summary
Adenosine may worsen hyperdynamic circulation in cirrhosis, but it does not cause the primary hemodynamic changes. This study found adenosine
Area of Science:
- Cardiovascular Physiology
- Gastroenterology
- Pharmacology
Background:
- Cirrhosis leads to significant hemodynamic alterations, including hyperdynamic circulation.
- The role of adenosine in mediating these cirrhotic hemodynamic changes remains unclear.
Purpose of the Study:
- To investigate the potential role of adenosine in the hemodynamic alterations associated with cirrhosis in a rat model.
- To determine if adenosine antagonism affects portal pressure and blood flow in cirrhotic rats.
Main Methods:
- Adenosine administration and 8-phenyltheophylline (adenosine antagonist) infusion in sham-operated and cirrhotic rats.
- Measurement of hemodynamic parameters, including portal pressure and portal tributary blood flow.
- Dose-response assessment of 8-phenyltheophylline to confirm antagonist efficacy.
Main Results:
- Adenosine induced hyperdynamic circulation and increased portal pressure in sham-operated rats.
- While adenosine also increased these parameters in cirrhotic rats, the effects were less pronounced than in sham-operated rats.
- 8-Phenyltheophylline significantly reduced portal tributary blood flow in sham-operated rats but had no significant effect in cirrhotic rats, despite adequate dosing.
Conclusions:
- Adenosine may exacerbate hyperdynamic circulation under certain conditions.
- The primary hemodynamic alterations observed in cirrhotic rats are not mediated by adenosine under normal physiological conditions.
- Adenosine antagonism does not significantly impact hemodynamics in cirrhotic rats, suggesting alternative pathways are involved.