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Individual organ contributions to the decrease in whole-body Vo2 with isoflurane.

R A Theye, J D Michenfelder

    Anesthesiology
    |January 1, 1975
    PubMed
    Summary
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    Isoflurane and halothane similarly affect canine oxygen consumption (Vo2). Neither anesthetic agent acts as a general metabolic depressant, with changes in whole-body Vo2 reflecting organ-specific functional alterations.

    Area of Science:

    • Veterinary Anesthesiology
    • Cardiovascular Physiology
    • Metabolic Research

    Background:

    • Inhalant anesthetics like isoflurane and halothane are commonly used in veterinary medicine.
    • Understanding their impact on systemic and organ-specific oxygen consumption (Vo2) is crucial for patient safety.
    • Previous studies have investigated halothane's effects, necessitating a comparative analysis with isoflurane.

    Purpose of the Study:

    • To compare the effects of isoflurane and halothane on canine whole-body Vo2.
    • To determine the impact of these anesthetics on myocardial, splanchnic, renal, and skeletal muscle Vo2.
    • To assess whether anesthetic agents are general metabolic depressants.

    Main Methods:

    • Canine whole-body Vo2 and Vo2 in specific organs (myocardial, splanchnic, renal, skeletal muscle) were measured.

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  • Isoflurane concentrations were matched to those used in prior halothane studies.
  • Data analysis focused on comparing Vo2 changes between the two anesthetic agents.

    • Main Results:

    • Increasing isoflurane concentrations led to a progressive decrease in whole-body Vo2.
    • The primary contributor to reduced Vo2 was myocardial Vo2, linked to decreased cardiac output and blood pressure, similar to halothane's effects.
    • No significant differences in whole-body or individual organ Vo2 were observed between isoflurane and halothane.

    Conclusions:

    • Isoflurane and halothane exhibit comparable effects on canine oxygen consumption.
    • Anesthetic agents do not appear to be general metabolic depressants.
    • Observed changes in whole-body Vo2 are the summation of anesthetic-induced alterations in individual organ function and metabolic demands.