Abstract |
Results from a previous study suggested that the cerebral protective effect of phenytoin (PNT) might be linked to its ability to reduce cerebrospinal fluid potassium (K+) accumulation during anoxia. In the present study two PNT doses (50 and 150 mg/kg) were examined to determine the ability of PNT to reduce cerebrospinal fluid K+ in cisterna magna samples after 10 and 20 minutes of circulatory arrest. Also examined were two other protective treatments ( pentobarbital, 33 mg/kg, and hypothermia to 35 C) which, in the hypoxic (F1O2 = 0.05) mouse, provide cerebral protection equivalent to PNT, 50 mg/kg. Both PNT doses significantly reduced cerebrospinal fluid K+ accumulation and tended to do so in a dose-related manner, similar to the dose-related cerebral protective effect of PNT. PNT, 50 mg/kg reduced K+ accumulation more effectively than either pentobarbital or hypothermia, whose protective effects are likely explained by a different mechanism (i.e., reduced cerebral metabolic rate). These data support the hypothesis that PNT-induced cerebral protection may be linked to its effect on cerebral K+ accumulation.
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Authors | A A Artru, J D Michenfelder |
Journal | Anesthesia and analgesia
(Anesth Analg)
Vol. 60
Issue 1
Pg. 41-5
(Jan 1981)
ISSN: 0003-2999 [Print] United States |
PMID | 7192948
(Publication Type: Comparative Study, Journal Article, Research Support, U.S. Gov't, P.H.S.)
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Chemical References |
- Phenytoin
- Pentobarbital
- Potassium
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Topics |
- Animals
- Cisterna Magna
- Dose-Response Relationship, Drug
- Heart Arrest
(metabolism)
- Hypothermia, Induced
- Hypoxia, Brain
(metabolism)
- Pentobarbital
(pharmacology)
- Phenytoin
(administration & dosage, pharmacology)
- Potassium
(cerebrospinal fluid)
- Rabbits
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