The influence of prostacyclin on the recovery of bioelectric cerebral activity after complete ischemia.

Complete cerebral ischemia (CCI) was evoked by closing the brachiocephalic trunk, the left subclavicular artery and both internal thoracic arteries with simultaneous depression of systemic arterial pressure (SAP) to 70-50 mm Hg. The experiments were performed with three groups of rabbits. The first group consisted of animals with 15 and 20 min CCI, not receiving PGI2. In the second group PGI2 was given for 15 min before and during 15 min CCI. The third group with 15 and 20 min CCI received PGI2 3 min before, during and for 15 min after ischemia. The recovery of ECoG and the activities of the respiratory and vasomotor centres were evaluated as were reflex reactions. In 38 percent of the second group of rabbits improvement of the neurological condition after CCI was noted, as compared with animals of the control groups and a faster recovery of the ECoG. In the third group the neurological state improved in 100 percent of cases with simultaneous significantly quicker recovery of the first symptoms of brain cortex bioelectric activity and continuous activity in ECoG records. Between groups 1 and 2, and group 3 there were differences concerning the time of recovery of ECoG, and the intensity of reflexes. The influence of PGI2 on the brain bioelectric activity of the animals after CCI was found to be favourable.