OBJECTIVE MEASUREMENT OF RELATIVE INTRACRANIAL BLOOD FLOW IN MAN

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Abstract
For a more complete description of the methods which have been applied to the study of cerebral blood flow the reader is referred to one of several excellent monographs on the subject.1 Suffice it to state that none of the methods offers a means of measuring accurately the intracranial blood flow of man or animal as it exists under physiologic conditions. Many methods do, however, indicate transient qualitative changes in blood flow, and it is through the use of these procedures that much of the present knowledge concerning the physiology of the cerebral circulation has been gained. The methods which have been adapted to study of the blood flow in man are, of course, subject to the same qualification. Gibbs2 devised a thermoelectric stromuhr which, when inserted into the internal jugular vein as it leaves the skull, accurately records qualitative changes in flow. The method is designed to

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