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    Real-time monitoring of brain energy metabolism in vivo using microelectrochemical sensors: the effects of anesthesia


    Lowry, John P. and Fillenz, Marianne (2001) Real-time monitoring of brain energy metabolism in vivo using microelectrochemical sensors: the effects of anesthesia. Bioelectrochemistry, 54 (1). pp. 39-47. ISSN 1567-5394

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    Abstract

    Rats were implanted in the striatum with a Pt/Ir electrode for measurement of regional cerebral blood flow (rCBF) (H2 clearance technique), a carbon paste electrode for monitoring tissue oxygen and a glucose biosensor for monitoring extracellular glucose. Changes in all three parameters were recorded in response to the intraperitoneal (i.p.) administration of the anesthetics chloral hydrate (350 mg/kg), sodium pentobarbitone (60 mg/kg) and ketamine (200 mg/kg). An i.p. injection of normal saline, given as a control for the injection of the anesthetics, produced a parallel increase in rCBF and tissue oxygen accompanied by a brief decrease in extracellular glucose. Changes in tissue oxygen reflected the changes in rCBF; there was a decrease in both after sodium pentobarbitone, a decrease followed by a rebound after ketamine and a transient increase after chloral hydrate. All three anesthetics produced a decrease in extracellular glucose. The disparity between the changes in glucose and the changes in rCBF and oxygen suggests that during anesthesia, the reduction in extracellular glucose is not due to a reduction in the direct delivery of glucose from the blood vascular system. These results also indicate that levels of enzymatic substrates and mediators, which are intrinsic to the design and operation of amperometric biosensors, are clearly altered in a complex manner by anesthesia and suggest that caution should be exercised in extrapolating data from acute anesthetized experiments to normal physiology.

    Item Type: Article
    Keywords: Electrochemical sensors; Extracellular glucose; Tissue oxygen; Cerebral blood flow; Anesthetics; Brain metabolism;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 8053
    Identification Number: https://doi.org/10.1016/S1567-5394(01)00109-8
    Depositing User: John Lowry
    Date Deposited: 23 Mar 2017 16:53
    Journal or Publication Title: Bioelectrochemistry
    Publisher: Elsevier
    Refereed: Yes
    Funders: Enterprise Ireland (EI), Health Research Board (HRB), NUI Maynooth
    URI:

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