Document Detail


Spreading depression induces prolonged reduction of cortical blood flow reactivity in the rat.
MedLine Citation:
PMID:  1397164     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of the present study was to examine the dynamic aspects of the cerebrovascular events occurring during and up to 2 h following cortical spreading depression (CSD) in the rat, using the mass spectrometry technique which enables continuous measurements of the cortical tissue PO2 and PCO2 and repeated blood flow measurements (CoBF) by helium clearance. We mostly sought to determine whether cortical perforation by a stimulation electrode induced long-lasting perturbation of the cortical vasoreactivity to hypercapnia and basal forebrain electrical stimulation. Cortical perforation in the animal under alpha-chloralose anesthesia, chronically implanted with mass spectrometry probes, was associated with biphasic changes in tissue gases. PO2 first briefly decreased (-7.8%) and then strongly increased (+79%) while PCO2 changed in the opposite direction (+7%, -13%) in the ipsilateral frontal cortex. Qualitatively similar changes occurred in the ipsilateral parietal cortex. The CoBF measurements showed a marked vasodilation (131 and 108% in the frontal and parietal cortex, respectively) in parallel with the PO2 increase, followed by a prolonged (60 min), moderate hypoperfusion (maximum -17% at 20 min after CSD). There was a pronounced reduction of vascular reactivity to both hypercapnia (20.3% of the control response) and substantia innominata stimulation (1/6 of the response obtained 80 min later) at 10 min after CSD. Both reactivities progressively recovered in approximately 2 h. Since the issue of CSD in human has become a popular hypothesis for migraine, the reduced cerebrovascular reactivity could constitute the basis of a test for the involvement of CSD in migraine.
Authors:
P Lacombe; R Sercombe; J L Correze; V Springhetti; J Seylaz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Experimental neurology     Volume:  117     ISSN:  0014-4886     ISO Abbreviation:  Exp. Neurol.     Publication Date:  1992 Sep 
Date Detail:
Created Date:  1992-10-26     Completed Date:  1992-10-26     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0370712     Medline TA:  Exp Neurol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  278-86     Citation Subset:  IM    
Affiliation:
Laboratoire de Recherches Cérébrovasculaires, CNRS, UA 641, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure
Carbon Monoxide / blood
Cerebral Cortex / blood supply*
Cortical Spreading Depression / physiology*
Electric Stimulation
Electroencephalography
Heart Rate
Male
Oxygen / blood
Partial Pressure
Prosencephalon / physiology*
Rats
Rats, Inbred F344
Regional Blood Flow
Time Factors
Chemical
Reg. No./Substance:
630-08-0/Carbon Monoxide; 7782-44-7/Oxygen

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


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