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The Journal of the Royal Society for the Promotion of Health
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Intracranial pressure monitoring by time domain analysis

R.P. Penson, MPhil

Engineering Systems Engineering Faculty Southampton Institute East Park Terrace Southampton SO4 OYN

R. Allen, PhD, BSc

Department of Mechanical Engineering University of Southampton University Road Highfield Southampton SO17 1BJ

This paper discusses the developments in the assessment of intracranial hypertension in humans and recent research carried out by the authors on the techniques for the non-inva sive measurement of intracranial pressure. A brief historical review sets the scene with regard to clinical and invasive methods for the observation of intracranial pressure and goes on to look at non-invasive techniques for measuring blood flow and pressure from which it is pro posed that intracranial pressure can be predicted. Although a simulation and a frequency domain analysis of the dynamics of the human brain has been carried out, this paper con centrates only on the time domain experiments and analysis. The time domain analysis uses the cross-correlation of the non-invasive blood flow of the middle cerebral artery with blood pressure measurements and their varying phase shift with trauma characteristics to make predictions of intracranial pressure trends that lead to pathologically dangerous conditions. The paper concludes with a section concerning the development of software and associated graphical displays that could inform staff of trends in intracranial pressure and life threat ening conditions so that immediate action can be taken.

Key Words: Intracranial pressure • time domain • non-invasive • measurement • cross-correlation • phase shift

The Journal of the Royal Society for the Promotion of Health, Vol. 118, No. 5, 289-294 (1998)
DOI: 10.1177/146642409811800515
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