Streptozotocin-induced diabetic hyperglycaemia produces more EEG activity than normoglycaemia and hypoglycaemia during and after anoxia loading in rats.
The brain requires oxygen and glucose for energy metabolism. Electroencephalogram (EEG) was recorded to determine the effect of glucose concentration on the cerebral function in hypoxic episode. Rats were divided into 3 groups: a streptozotocin-induced diabetic hyperglycaemic group, a normoglycaemic group, and an insulin-induced hypoglycaemic group. Hypoxia was induced by ventilating with 100% N2 for 3 min. EEG amplitude both 5 and 10 min after anoxia loading was higher in the diabetic hyperglycaemic than in the normoglycaemic group, though not significantly. Time for decreasing the EEG amplitude during anoxia loading was significantly longer in the hyperglycaemic than in the normoglycaemic group. Time for recovering the EEG amplitude after anoxia loading was significantly shorter in the hyperglycaemic group and was longer, though not significantly, in the hypoglycaemic group than in the normoglycaemic one. These results suggest the brain is more tolerant to hypoxia during diabetic hyperglycaemia than during normoglycaemia.
Tagawa
A
A
Department of Neurology, Teikyo University School of Medicine, Ichihara Hospital, Ichihara City, Japan.
Mokuda
O
O
Sakamoto
Y
Y
Shimizu
N
N
D000818:Animals; D001786:Blood Glucose / Q000378:metabolism*; D001921:Brain / Q000378:metabolism / Q000503:physiopathology*; D003921:Diabetes Mellitus, Experimental / Q000503:physiopathology*; D004569:Electroencephalography / Q000379:methods; D006943:Hyperglycemia / Q000503:physiopathology; D007003:Hypoglycemia / Q000503:physiopathology; D000860:Hypoxia / Q000503:physiopathology*; D008297:Male; D009584:Nitrogen / Q000633:toxicity; D051381:Rats; D017208:Rats, Wistar
D001786:Blood Glucose; D009584:Nitrogen