NDLI: Cation activities in reversible ischemia of the cat brain.

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Cation activities in reversible ischemia of the cat brain.

Content Provider	Semantic Scholar
Author	Hossmann, K. A. Sakaki, Saburo Zimmerman, V.
Copyright Year	1977
Abstract	In normothermic anesthetized cats cerebral blood flow was interrupted completely for one hour by arterial clamping and induced hypotension. The effect of ischemia on the ionic gradients of the cerebral cortex was assayed by determining total cortical electrolytes and by recording the activities of extracellular potassium ([K+i1e) and subarachnoid sodium ions ([Na+])s) with ion-sensitive electrodes. During ischemia [K+]e increased from 3.3+/-0.3 to 56+/-5.4 mEq per liter (means+/-SE) and [Na+]s decreased from 133+/-3.8 to 53+/-5.8 mEq per liter. When the brains were recirculated with blood after one hour's ischemia, [K+]e and [Na+]a gradually returned to normal within 45 minutes. The calculated intracellular uptake of sodium during ischemia amounted to 139 mEq per kilogram dry weight, whereas the intracellular release of potassium was only 64 mEq per kilogram. The increase in intracellular cation was accompanied by a movement of water from the extracellular into the intracellular compartment, causing a reversible shrinkage of the extracellular space from 18.9 to 8.5 vol %. The changes in ionic gradients were related to the development and resolution of ischemic brain swelling, and to the elctrophysiological events during and after ischemia.
Starting Page	77
Ending Page	81
Page Count	5
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://stroke.ahajournals.org/content/strokeaha/8/1/77.full.pdf?download=true
Alternate Webpage(s)	http://stroke.ahajournals.org/content/strokeaha/8/1/77.full.pdf
PubMed reference number	835160v1
Volume Number	8
Issue Number	1
Journal	Stroke
Language	English
Access Restriction	Open
Subject Keyword	Anatomical compartments Brain Edema Cations Cerebral cortex Cerebrovascular Circulation Electrolytes Iontophoresis Ischemia Kilogram Potassium Sodium Cation Volume liter milliequivalent (meq) pediatric intracranial germ cell brain tumor
Content Type	Text
Resource Type	Article

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