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Toru Hayakawa, MD; Arthur G. Waltz, MD

Arch Neurol. 1978;35(4):206-212.

Abstract
• Autogenous blood was injected repeatedly into the intracranial subarachnoid space of cats, the heads of which were placed in one of four positions (prone, supine, left side down, and right side down). Epidural pressures, mean aortic blood pressures, and pulse rates were measured, and their responses to the repeated injections were analyzed. The distribution of the injected blood was different among the four groups. The cats in the supine position had the greatest amounts of blood in the posterior fossa and tolerated the injections least well. The position of the head at the time of a subarachnoid hemorrhage may influence the prognosis; positions that favor accumulations of blood around the brain stem carry the greatest risk.

Author Affiliations
From the Department of Neurosurgery (Dr Hayakawa), Osaka University Medical School, Osaka, Japan, and the Department of Neurology (Dr Waltz), Pacific Medical Center, San Francisco.

Footnotes
Accepted for publication Feb 14, 1977.

Reprint requests to the Department of Neurology, Pacific Medical Center, PO Box 7999, San Francisco, CA 94120 (Dr Waltz).

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