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INTRAVENOUS POTASSIUM, CALCIUM AND MAGNESIUM AND THE CORTICAL ELECTROGRAM OF THE CAT

INTRAVENOUS POTASSIUM, CALCIUM AND MAGNESIUM AND THE CORTICAL ELECTROGRAM OF THE CAT P. K. SMITH Memorial Foundation for Neuro-Endocrine Research, Worcester State Hospital, Worcester, Mass., Laboratory of Physiology, Department of Internal Medicine, Laboratory of Pharmacology, YaZe University School of Medicine, New Haven, Conn. (Received for publication October 6, 1942) ALTERATIONS in concentration of potassium calcium in the blood stream may on occasion influence brain potentials (3). Since these ions affect both cardiac activity blood pressure (7, 8, 13, 16), it is possible that some of the effects on the brain potentials which have been previously described are secondary to cardiovascular changes. In the present study an attempt is made to distinguish between those effects of potassium, calcium magnesium ions on the cortical electrogram which are independent of cardiovascular disturbances those which are regularly associated with them. MATERIAL METHODS Sixteen cats under light nembutal anesthesia (35 mg. per kg. body weight, intraperitoneally) were used in these experiments. The left hemisphere was exposed brain potentials recorded simultaneously from two or three areas, using lead solder electrodes 3 mm. in diameter. A reference electrode was attached to the left ear. The areas of the brain on which the electrodes were placed in the various experiments are indicated by the heavy dots of Fig. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

INTRAVENOUS POTASSIUM, CALCIUM AND MAGNESIUM AND THE CORTICAL ELECTROGRAM OF THE CAT

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Publisher
The American Physiological Society
Copyright
Copyright © 1943 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
Publisher site
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Abstract

P. K. SMITH Memorial Foundation for Neuro-Endocrine Research, Worcester State Hospital, Worcester, Mass., Laboratory of Physiology, Department of Internal Medicine, Laboratory of Pharmacology, YaZe University School of Medicine, New Haven, Conn. (Received for publication October 6, 1942) ALTERATIONS in concentration of potassium calcium in the blood stream may on occasion influence brain potentials (3). Since these ions affect both cardiac activity blood pressure (7, 8, 13, 16), it is possible that some of the effects on the brain potentials which have been previously described are secondary to cardiovascular changes. In the present study an attempt is made to distinguish between those effects of potassium, calcium magnesium ions on the cortical electrogram which are independent of cardiovascular disturbances those which are regularly associated with them. MATERIAL METHODS Sixteen cats under light nembutal anesthesia (35 mg. per kg. body weight, intraperitoneally) were used in these experiments. The left hemisphere was exposed brain potentials recorded simultaneously from two or three areas, using lead solder electrodes 3 mm. in diameter. A reference electrode was attached to the left ear. The areas of the brain on which the electrodes were placed in the various experiments are indicated by the heavy dots of Fig.

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Jan 1, 1943

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