| Oscillations of cortical oxidative metabolism and microcirculation in the ischaemic brain. | |
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MedLine Citation:
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PMID: 1675446 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A new in vivo model for studying brain metabolic and haemodynamic oscillatory phenomena during ischaemia is described. In this model acute or chronic occlusion of one or two carotid arteries in the rat is performed. Due to the partial ischaemia developed, oscillations in the level of intramitochondrial pyridine nucleotides (NADH) as well as flavoproteins (Fp) were recorded from the brain by monitoring the fluorescence of these respiratory chain components. The two fluorescent signals (NADH and Fp) were measured by using the time sharing or DC fluorometer/reflectometer. The changes in the reflected light at the excitation wavelengths (366 and 450 nm) were recorded simultaneously. Bilateral carotid artery occlusion induced immediate oscillations (6-9 waves per min) in the mitochondrial redox state as well as in tissue blood volume in both hemispheres. To verify the accuracy of the NADH monitoring system, including the correction technique for haemodynamic and other artifacts, we used the intracarotid artery saline bolus injection approach. The results could be summarized as follows: (1) unilateral carotid artery occlusion resulted in delayed development of oscillations, particularly in the ipsilateral hemisphere; (2) the oscillation phenomenon was reversible if recirculation restarted within 5 min. Occlusion for more than 30 min resulted in irreversible oscillations; (3) the oscillation appearances and intensities were affected by various physiological conditions. Vasoconstriction, induced by hyperoxia, stimulated the oscillations while vasodilation, induced by hypercapnia, depressed them. Anoxia, hypoxia and spreading depression (SD) abolished the oscillations. Glucose injection was not effective.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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A Mayevsky; I Ziv |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Neurological research Volume: 13 ISSN: 0161-6412 ISO Abbreviation: Neurol. Res. Publication Date: 1991 Mar |
Date Detail:
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Created Date: 1991-07-17 Completed Date: 1991-07-17 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 7905298 Medline TA: Neurol Res Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 39-47 Citation Subset: IM; S |
Affiliation:
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Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia 19104-6089. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Anesthetics
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pharmacology Animals Anoxia / complications, metabolism Brain / metabolism* Brain Chemistry Brain Ischemia / metabolism* Cations / metabolism Cerebrovascular Circulation* Cortical Spreading Depression Energy Metabolism / drug effects Flavoproteins / analysis Fluorometry Male Microcirculation Mitochondria / metabolism NAD / analysis Oxidation-Reduction Oxygen Consumption Periodicity* Rats Wakefulness |
| Grant Support | |
ID/Acronym/Agency:
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NS-22881/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Anesthetics; 0/Cations; 0/Flavoproteins; 53-84-9/NAD |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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