Document Detail


Effects of increased intracranial pressure in brain surface microcirculation in rats.
MedLine Citation:
PMID:  7847139     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of increased intracranial pressure (ICP) on pial vessel diameters were investigated in rats using a cranial window and fluorescence microscopy. The brain surface was superfused with mock cerebro-spinal fluid (CSF) at a constant rate (5 ml/h), and the ICP was raised up to 20 mmHg by elevating a CSF-reservoir connected to the CSF-outlet of the window. Arterioles dilated as the ICP increased (+ 12% dilation at 20 mmHg ICP). Following a rapid reduction of the raised ICP to normal, arteriolar diameters did not return to control values (+ 7% dilatation), while venules dilated (+ 3%), indicating reactive hyperaemia. At this time, CO2 inhalation induced a low response in the arterioles (+ 0.4%/mmHg PaCO2 increase) and an over-response in the venules (+ 0.3%/mmHg). The CO2 response decreased in smaller arterioles (< or = 30-40 microns phi). In addition, a few animals showed extravasation of Na(+)-fluorescein administered intravenously. Our results indicate that reactive hyperaemia can take place following a rapid return from an increased ICP to an normal level, even in cases of mild intracranial hypertension; a disruption of the blood-brain barrier may follow.
Authors:
S Kawamura; N Yasui
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta neurochirurgica     Volume:  128     ISSN:  0001-6268     ISO Abbreviation:  Acta Neurochir (Wien)     Publication Date:  1994  
Date Detail:
Created Date:  1995-03-09     Completed Date:  1995-03-09     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0151000     Medline TA:  Acta Neurochir (Wien)     Country:  AUSTRIA    
Other Details:
Languages:  eng     Pagination:  21-5     Citation Subset:  IM    
Affiliation:
Department of Neurosurgery, Research Institute for Brain and Blood Vessels-Akita, Japan.
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MeSH Terms
Descriptor/Qualifier:
Animals
Arterioles / physiology
Blood-Brain Barrier
Brain / blood supply*
Intracranial Pressure*
Male
Microcirculation / physiology*
Microscopy, Fluorescence
Rats
Rats, Sprague-Dawley
Vasoconstriction

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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