Document Detail


Hyperventilation-induced cerebral hypoxia.
MedLine Citation:
PMID:  6774644     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Acute respiratory alkalosis decreases cerebral blood flow, increases the affinity of hemoglobin for oxygen, and can result in cerebral hypoxia. This experiment was designed to study this phenomenon in dogs, and to demonstrate the effect of an increased concentration of inspired oxygen. Seven mongrel dogs were anesthetized with pentobarbital and ventilated with a constant volume respirator. A Telfon-coated stainless steel catheter was placed through a craniotomy into the parietal lobe and advanced through the corona radiata to monitor cerebral PO2 and PCO2 with a mass spectrometer. Steady state cerebral and arterial gas tensions were recorded during eucapnic ventilation with air, eucapnic ventilation with 100% oxygen, hypocapnic ventilation with air, and hypocapnic ventilation with 100% oxygen. Decreased cerebral tissue oxygen tension was demonstrated in hypocapnic dogs ventilated with air. When the concentration of inspired oxygen was increased, the relatively small increase in artrial oxygen content was associated with a marked increase in PO2 at the cerebral tissue level. This may be of clinical importance in therapeutic or centrally mediated hyperventilation.
Authors:
J A Kennealy; J E McLennan; R G Loudon; R L McLaurin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American review of respiratory disease     Volume:  122     ISSN:  0003-0805     ISO Abbreviation:  Am. Rev. Respir. Dis.     Publication Date:  1980 Sep 
Date Detail:
Created Date:  1980-11-24     Completed Date:  1980-11-24     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0370523     Medline TA:  Am Rev Respir Dis     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  407-12     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Carbon Dioxide / blood
Dogs
Hyperventilation / blood*
Hypoxia, Brain / blood,  etiology*
Oxygen / blood
Partial Pressure
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide; 7782-44-7/Oxygen

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


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