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Brain Metabolism and Arterial Acid-Base Balance Following Bilateral Carotid Occlusion in Normotensive and Experimental Hypertensive Rats

Published online by Cambridge University Press:  18 September 2015

M. Fujishima ,
Y. Morotomi ,
K. Tamaki ,
Y. Nakatomi ,
J. Ogata ,
S. Takishita ,
K. Kumamoto ,
K. Fukiyama  and
T. Omae
M. Fujishima*
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
Y. Morotomi
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
K. Tamaki
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
Y. Nakatomi
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
J. Ogata
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
S. Takishita
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
K. Kumamoto
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
K. Fukiyama
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
T. Omae
Affiliation:
Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Fukuoka, Japan
*
The Second Department of Internal Medicine, The Faculty of Medicine, Kyushu University, Maidashi 3-1-1, Higashi-ku, Fukuoka City 812, Japan
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Summary:

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The effects of bilateral common carotid artery occlusion en brain metabolism and arterial acid-base balance were studied in normotensive and experimental renovascular hypertensive rats.

One hour after carotid occlusion in hypertensive rats, supratentorial lactate increased to 383% and lactate-pyruvate ratio to 280% of the controls, while adenosine triphosphate (ATP) decreased to 69%. These metabolic changes were thought to be due to cerebral ischemia. Arterial pC02 was lowered and the pH was raised in the hypertensive animals due to cerebral ischemia induced hyperventilation. In the normotensive rats, carotid occlusion had minimal effects on cerebral metabolism and arterial acid-base balance.

These results suggest that hypertensive rats are more susceptible to cerebral ischemia caused by carotid occlusion than normotensive rats. Increased cerebrovascular resistance in hypertension is discussed as a casual factor in cerebral ischemia.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 5 , Issue 1 , February 1978 , pp. 27 - 32
Copyright
Copyright © Canadian Neurological Sciences Federation 1978

References

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