Intracranial pressure monitoring: Application of spectral analysis to the classification of B-waves

Richard L. Pasley, Matthew J.L. Connoly, Henrietta S. Bada, Shelly D. Timmons, Gregory Stidham, Charles W. Leffler, Michael L. Daley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

During intensive care monitoring of patients with head-injury both arterial blood pressure (ABP) and intracranial pressure (ICP) monitoring is accomplished with a bedside physiologic monitor. The ICP recording may contain low frequency oscillations termed B-wave. The purpose of this paper is to describe a technique to classify the spectral characteristics of B-waves in the ICP recording. A linear modulation model of arterial pressure modulated by ventilator induced pleural pressure changes was devised to describe the spectral characteristics of ICP and ABP laboratory and clinical recordings that did not contain B-waves. ICP recordings that contained B-waves were classified according to whether or not their spectral characteristics were sub-harmonically related to the ventilation frequency. It is suggested that patient-ventilator interaction cause low-frequency oscillations that are sub-harmonically related to the ventilator-frequency. In contrast, the presence of low frequency spectra not related to the ventilation-frequency or evident as side bands at cardiac frequencies likely indicates the occurrence of oscillations of the cerebral vasculature associated with loss of autoregulation of cerebral blood flow.

Original languageEnglish (US)
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PublisherIEEE
Number of pages1
ISBN (Print)0780356756
StatePublished - Dec 1 1999
EventProceedings of the 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Fall Meeting of the Biomedical Engineering Society (1st Joint BMES / EMBS) - Atlanta, GA, USA
Duration: Oct 13 1999Oct 16 1999

Publication series

NameAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume1
ISSN (Print)0589-1019

Other

OtherProceedings of the 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Fall Meeting of the Biomedical Engineering Society (1st Joint BMES / EMBS)
CityAtlanta, GA, USA
Period10/13/9910/16/99

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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    Pasley, R. L., Connoly, M. J. L., Bada, H. S., Timmons, S. D., Stidham, G., Leffler, C. W., & Daley, M. L. (1999). Intracranial pressure monitoring: Application of spectral analysis to the classification of B-waves. In Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings; Vol. 1). IEEE.