Document Detail

Effect of the adrenergic beta receptor blocker propranolol on the dilatation of cerebrocortical vessels evoked by arterial hypoxia.
MedLine Citation:
PMID:  6331065     Owner:  NLM     Status:  MEDLINE    
In order to elucidate the importance of adrenergic beta receptors in the regulation of cerebral microcirculation during arterial hypoxia, chloralose anaesthetized cats were treated with propranolol hydrochloride. Arterial hypoxia, lasting for approximately 4 min, was induced by respiring the animals with a gas mixture containing 7% oxygen balanced in nitrogen gas. Arterial hypoxia was induced in the same animals before and during continuous infusion of propranolol (0.05 mg/kg/min into the lingual artery). Cerebrocortical vascular volume ( CVV ) and NADH fluorescence were measured through a cranial window with a microscope fluororeflectometer . Control arterial hypoxia (no treatment) increased CVV and NADH reduction by 22.2 +/- 2% and 20.4 +/- 2.1%, respectively. Following 1 mg/kg propranolol treatment arterial hypoxia of the same severity resulted in only approximately 2/3 of the CVV response obtained during the control arterial hypoxia. Since arterial hypoxia induced similar changes in arterial blood gases, arterial blood pressure, and intracranial pressure in both cases, our results indicate that the cortical vasodilatation occurring during arterial hypoxia is due, at least in part, to the activation of adrenergic beta receptors.
E Dóra; A G Kovách
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Acta physiologica Hungarica     Volume:  63     ISSN:  0231-424X     ISO Abbreviation:  Acta Physiol Hung     Publication Date:  1984  
Date Detail:
Created Date:  1984-07-30     Completed Date:  1984-07-30     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8309201     Medline TA:  Acta Physiol Hung     Country:  HUNGARY    
Other Details:
Languages:  eng     Pagination:  35-41     Citation Subset:  IM    
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MeSH Terms
Blood Pressure / drug effects
Cerebral Cortex / blood supply*,  metabolism
Isoproterenol / pharmacology
Microcirculation / drug effects
NAD / metabolism
Oxygen / blood*
Propranolol / pharmacology*
Receptors, Adrenergic, beta / physiology*
Vasoconstriction / drug effects
Vasodilation / drug effects*
Grant Support
Reg. No./Substance:
0/Receptors, Adrenergic, beta; 525-66-6/Propranolol; 53-84-9/NAD; 7683-59-2/Isoproterenol; 7782-44-7/Oxygen

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