Effects of Ischemia on the Mg + + Requiring Adenosine Triphosphatase Associated With Neuronal Synaptic Vesicles in Gerbil Brain

The effect of glucose upon restitution after transient cerebral ischemia: a summary

The study describes a reproducible model of complete brain ischemia in rats. Rats with different plasma glucose concentrations were exposed to 10 min of complete cerebral ischemia achieved by compression of neck vessels by a pneumatic cuff. All 30 rats, except one, in which pre-ischemic plasma glucose level were lower than 22 mM (range 1.6-22) survived 10 min complete ischemia and made a similar recovery. Ten rats with pre-ischemic plasma glucose levels above 22 mM (range 22-47.2) died from seizures in the post-ischemic period. Post-ischemic treatment of seizures and hyperglycemia in the hyperglycemic rats significantly improved recovery. In conclusion, pre-ischemic hyperglycemia above 22 mM impairs recovery after complete ischemia by inducing seizures, post-ischemic hyperglycemia and lactic acidosis.

Improvement of restitution from cerebral ischemia in hyperglycemic rats by pentobarbital or diazepam

Hyperglycemic rats were exposed to 10 min of complete cerebral ischemia. Rats with 26 mM (range 23-27 mM) plasma glucose levels died. Rats with the same degree of hyperglycemia, treated after ischemia with pentobarbital (75-95 mg/kg) or diazepam (10-13 mg/kg), survived the observation period of 21 days and recovered, albeit incompletely. The same treatment given to rats with higher degrees of hyperglycemia did not prevent death. It is concluded that postischemic treatment with anticonvulsive drugs may improve clinical restitution from ischemia in moderately hyperglycemic rats.