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INTRACRANIAL PRESSURE: SPECTRAL CHARACTERISTICS OF B-WAVES AND OTHER LOW-FREQUENCY ACTIVITY.

INTRACRANIAL PRESSURE: SPECTRAL CHARACTERISTICS OF B-WAVES AND OTHER LOW-FREQUENCY ACTIVITY. Michael L. Daley, Dien Nguyen, Matthew J. L. Connolly, Shelley Timmons, John Angel, and Charles W. Leffler, The University of Memphis, Memphis, Tennessee (MLD, DN, MJLC), and The University of Tennessee, Memphis, Memphis, Tennessee (ST, JA, CWL). Low frequency oscillations of intracranial pressure (ICP) in the range of 0.5 to 2.0 cycles/min have been termed B-waves. Such oscillations may or may not be synchronized with ventilation and/or arterial blood pressure. The objectives of this study were to: 1) describe the low frequency spectral characteristics of ICP and ABF recordings with a mathematical model based on pleural pressure modulation of the vasculature, and 2) classify B-waves and other slow wave activity according to their spectral properties. The linear modulation model predicted the frequency location of spectra associated ventilation of six clinical pressure recordings with B-waves to within a 1% error. Var iation of heart-rate was not associated with the occurrence of B-waves. It is concluded that the low frequency spectra of ICP recordings containing waves synchronized with ventilation can be accurately described by a mathematical model of modulation by pleural pressure.
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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:194
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