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Cerebral blood flow in the rat was monitored by a venous outflow technique with an extracorporeal circulation, which allows for the continuous recording of flow over periods of several hours. The adenosine deaminase inhibitors erythro-9-(2-hydroxy-3-nonyl)adenine (EHNA) (1.0-100 micrograms/kg) and deoxycoformycin (0.1-1 micrograms/kg) potentiated the reactive hyperemia elicited by a brief (24-s) anoxic challenge. Basal flow rate was unaltered by EHNA administration and slightly enhanced by deoxycoformycin. The results are consistent with the hypothesis that adenosine plays a significant role in cerebral vascular regulation and suggest that low doses of these deaminase inhibitors may be useful in the treatment of cerebral vascular insufficiency.

Adenosine Deaminase Inhibitors Enhance Cerebral Anoxic Hyperemia in the Rat