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Development of a noninvasive technique for the measurement of intracranial pressureIntracranial pressure (ICP) dynamics are important for understanding adjustments to altered gravity. Previous flight observations document significant facial edema during exposure to microgravity, which suggests that ICP is elevated during microgravity. However, there are no experimental results obtained during space flight, primarily due to the invasiveness of currently available techniques. We have developed and refined a noninvasive technique to measure intracranial pressure noninvasively. The technique is based upon detecting skull movements of a few micrometers in association with altered intracranial pressure. We reported that the PPLL technique has enough sensitivity to detect changes in cranial distance associated with the pulsation of ICP in cadavera. In normal operations, however, we place a transducer on the scalp. Thus, we cannot rule out the possibility that the PPLL technique picks up cutaneous pulsation. The purpose of the present study was therefore to show that the PPLL technique has enough sensitivity to detect changes in cranial distance associated with cardiac cycles in vivo.
Document ID
20040088992
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ueno, T.
(NASA Ames Research Center Moffett Field CA United States)
Shuer, L. M.
Yost, W. T.
Hargens, A. R.
Date Acquired
August 21, 2013
Publication Date
November 1, 1998
Publication Information
Publication: Uchu seibutsu kagaku
Volume: 12
Issue: 3
ISSN: 0914-9201
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: 1797-7012
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center ARC
NASA Discipline Cardiopulmonary

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