| Ventricle wall movements and cerebrospinal fluid flow in hydrocephalus. | |
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MedLine Citation:
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PMID: 21275563 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Object The dynamics of fluid flow in normal pressure hydrocephalus (NPH) are poorly understood. Normally, CSF flows out of the brain through the ventricles. However, ventricular enlargement during NPH may be caused by CSF backflow into the brain through the ventricles. A previous study showed this reversal of flow; in the present study, the authors provide additional clinical data obtained in patients with NPH and supplement these data with computer simulations to better understand the CSF flow and ventricular wall displacement and emphasize its clinical implications. Methods Three NPH patients and 1 patient with aqueductal stenosis underwent cine phase-contrast MR imaging (cine MR imaging) for measurement of CSF flow and ventricle wall movement during the cardiac cycle. These data were compared to data previously obtained in 8 healthy volunteers. The CSF flow measurements were obtained at the outlet of the aqueduct of Sylvius. Calculation of the ventricular wall movement was determined from the complete set of cine MR images obtained axially at the middle of the lateral ventricle. The data were obtained before and after CSF removal with a ventriculoperitoneal shunt with an adjustable valve. To supplement the clinical data, a computational model was used to predict the transmural pressure and flow. Results In healthy volunteers, net CSF aqueductal flow was 1.2 ml/minute in the craniocaudal direction. In patients with NPH, the net CSF flow was in the opposite direction-the caudocranial direction-before shunt placement. After shunting, the magnitude of the abnormal fluid flow decreased or reversed, with the flow resembling the normal flow patterns observed in healthy volunteers. Conclusions The authors' MR imaging-based measurements of the CSF flow direction and lateral ventricle volume size change and the results of computer modeling of fluid dynamics lead them to conclude that the directional pattern and magnitude of CSF flow in patients with NPH may be an indication of the disease state. This has practical implications for shunt design and understanding the mechanisms that produce hydrocephalus. |
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Authors:
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Richard D Penn; Sukhraaj Basati; Brian Sweetman; Xiaodong Guo; Andreas Linninger |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-1-28 |
Journal Detail:
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Title: Journal of neurosurgery Volume: - ISSN: 1933-0693 ISO Abbreviation: - Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-1-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0253357 Medline TA: J Neurosurg Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Bioengineering, University of Illinois at Chicago; and. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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