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NON-INVASIVE METHOD OF ASSESSING RELATIVE CHANGES OF CEREBRAL BLOOD VOLUME.

NON-INVASIVE METHOD OF ASSESSING RELATIVE CHANGES OF CEREBRAL BLOOD VOLUME. Ricky Dorsey*, Nicole Bond*, Monique Reeves*, Richard Pasley*, and Michael L. Daley, The University of Memphis, Memphis, Tennessee. Knowledge of the ability of the cerebral vasculature of a patient with severe head-injury to dilate and constrict is of value during emergency and intensive care management. Near infrared spectroscopy (NIRS) provides a non-invasive means of monitoring change

of cerebral blood volume. The purpose of this pilot study was to determine whether or not a non-invasive method based on NIRS could detect cerebral vascular changes in response to increases and decreases in cerebral perfusion pressure. Three subjects were used to develop the instrumentation. Each subject was instructed to lie quietly on a horizontal mattress supported by a wooden base. A hydraulic jack attached to the middle of either the head or foot of the base was used to tilt the subject either 15 degrees head-up or 15 degrees head-down. Prelimina ry recordings of NIRS during the tilt-up response indicate that compensatory cerebral vascular dilation following the stop change in body angle requires 20 to 50 sec.
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Author:DYCUS, PATRICIA; VISCO, DON
Publication:Journal of the Tennessee Academy of Science
Article Type:Brief Article
Geographic Code:1U6TN
Date:Jan 1, 2000
Words:184
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