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Non-invasive assessment of intracranial compliance using a new 2-D "transit time" vs "frequency centroid" map

Non-invasive assessment of intracranial compliance using a new 2-D "transit time" vs "frequency centroid" map
Non-invasive assessment of intracranial compliance using a new 2-D "transit time" vs "frequency centroid" map
The objective of this research was to develop a new static two dimensional graphic display indicating changes to intracranial compliance using non invasive ultrasonic Doppler measurements of the Middle Cerebral Artery (MCA) velocity and Arterial Blood Pressure (ABP). ABP and MCA velocity were measured in a volunteer patient study and the results for hypo-, normo- and hyper-capnia, conditions were recorded. Cross-correlation analysis between ABP and MCA velocity predicted a change in "transit time" between the two parameters and a Fourier Transform analysis of the MCA velocity data predicted a change in "frequency centroid" over the 0 to 10 Hz range indicating change with intracranial compliance. The results for the hyper-capnia condition were: "Transit Time"--0 ms, "Frequency Centroid"--1.9 Hz, for the normo-capnia condition: "Transit Time"--18 ms, "Frequency Centroid"--2.5 Hz, for the hypo-capnia condition: "Transit Time"--38 ms, "Frequency Centroid"--3.1 Hz. Plotting the results on a graph with "Frequency Centroid" as the vertical axis and "Transit Time" as the horizontal axis yields a locus possibly indicating a change to intracranial compliance.
0001-6268
187-190
Penson, R.P.
a6a0b06b-6b11-48c4-a35f-e33bc3430c71
Allen, R.
956a918f-278c-48ef-8e19-65aa463f199a
Birch, A.
755f2236-4c0c-49b5-9884-de4021acd42d
Czosnyka, M.
5701e510-1371-4d1a-93ac-378e817875ed
Pickard, J.D.
96eba9f8-c5e1-49c6-ad4d-d787adf4d356
Kirkpatrick, P.J.
7b8ccd3c-5039-4069-b2d6-ad8152ff9bad
Smielewski, P.
b695f926-1e94-461c-91f5-38355af67d6c
Hutchinson, P.
100548aa-9ae0-4ac3-9540-2c102fb86da8
Penson, R.P.
a6a0b06b-6b11-48c4-a35f-e33bc3430c71
Allen, R.
956a918f-278c-48ef-8e19-65aa463f199a
Birch, A.
755f2236-4c0c-49b5-9884-de4021acd42d
Czosnyka, M.
5701e510-1371-4d1a-93ac-378e817875ed
Pickard, J.D.
96eba9f8-c5e1-49c6-ad4d-d787adf4d356
Kirkpatrick, P.J.
7b8ccd3c-5039-4069-b2d6-ad8152ff9bad
Smielewski, P.
b695f926-1e94-461c-91f5-38355af67d6c
Hutchinson, P.
100548aa-9ae0-4ac3-9540-2c102fb86da8

Penson, R.P., Allen, R. and Birch, A. , Czosnyka, M., Pickard, J.D., Kirkpatrick, P.J., Smielewski, P. and Hutchinson, P. (eds.) (2002) Non-invasive assessment of intracranial compliance using a new 2-D "transit time" vs "frequency centroid" map. Acta Neurochirurgica, 81, 187-190.

Record type: Article

Abstract

The objective of this research was to develop a new static two dimensional graphic display indicating changes to intracranial compliance using non invasive ultrasonic Doppler measurements of the Middle Cerebral Artery (MCA) velocity and Arterial Blood Pressure (ABP). ABP and MCA velocity were measured in a volunteer patient study and the results for hypo-, normo- and hyper-capnia, conditions were recorded. Cross-correlation analysis between ABP and MCA velocity predicted a change in "transit time" between the two parameters and a Fourier Transform analysis of the MCA velocity data predicted a change in "frequency centroid" over the 0 to 10 Hz range indicating change with intracranial compliance. The results for the hyper-capnia condition were: "Transit Time"--0 ms, "Frequency Centroid"--1.9 Hz, for the normo-capnia condition: "Transit Time"--18 ms, "Frequency Centroid"--2.5 Hz, for the hypo-capnia condition: "Transit Time"--38 ms, "Frequency Centroid"--3.1 Hz. Plotting the results on a graph with "Frequency Centroid" as the vertical axis and "Transit Time" as the horizontal axis yields a locus possibly indicating a change to intracranial compliance.

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More information

Published date: 2002

Identifiers

Local EPrints ID: 10881
URI: http://eprints.soton.ac.uk/id/eprint/10881
ISSN: 0001-6268
PURE UUID: 6cf74846-53a1-483a-9734-270eaa341afb
ORCID for A. Birch: ORCID iD orcid.org/0000-0002-2328-702X

Catalogue record

Date deposited: 10 Feb 2006
Last modified: 09 Jan 2022 04:03

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Contributors

Author: R.P. Penson
Author: R. Allen
Author: A. Birch ORCID iD
Editor: M. Czosnyka
Editor: J.D. Pickard
Editor: P.J. Kirkpatrick
Editor: P. Smielewski
Editor: P. Hutchinson

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