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Liver circulation and function during isoflurane and halothane anesthesia.

S Gelman, K C Fowler, L R Smith

    Anesthesiology
    |December 1, 1984
    PubMed
    Summary
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    Isoflurane anesthesia maintained hepatic oxygen supply better than halothane anesthesia in dogs. Portal and hepatic arterial blood flow were significantly impacted by anesthetic choice and concentration.

    Area of Science:

    • Anesthesiology
    • Veterinary Medicine
    • Physiology

    Background:

    • Anesthetic agents can significantly alter cardiovascular function and organ perfusion.
    • Understanding the impact of different anesthetics on hepatic blood flow is crucial for patient safety.

    Purpose of the Study:

    • To compare the effects of isoflurane and halothane anesthesia on hepatic arterial blood flow (HABF) and portal blood flow (PBF) in dogs.
    • To assess the impact of anesthetic depth on these hemodynamic parameters.

    Main Methods:

    • Measurements of HABF and PBF using microspheres in 18 dogs under awake, isoflurane, and halothane anesthesia at varying MAC levels.
    • Surgical preparation included placement of atrial and aortic catheters.
    • Indocyanine green (ICG) pharmacokinetics were assessed to evaluate liver function.

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    Main Results:

    • Both isoflurane and halothane anesthesia decreased mean arterial pressure (MAP) and cardiac index (CI), along with PBF.
    • HABF increased with isoflurane but decreased with halothane at 2 MAC.
    • Hepatic oxygen supply appeared better maintained with isoflurane.

    Conclusions:

    • Isoflurane may offer a better profile for maintaining hepatic oxygen supply compared to halothane.
    • Anesthetic choice and concentration significantly influence canine hepatic and portal blood flow dynamics.