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Intestinal circulation during inhalation anesthesia.

M Tverskoy, S Gelman, K C Fowler

    Anesthesiology
    |April 1, 1985
    PubMed
    Summary
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    Inhalational agents affect intestinal blood flow differently. Nitrous oxide and isoflurane constrict intestinal vessels, while halothane dilates them, impacting circulation.

    Area of Science:

    • Physiology
    • Pharmacology

    Background:

    • Understanding the impact of anesthetic agents on splanchnic circulation is crucial for patient management.
    • Previous studies have shown varying effects of anesthetics on organ blood flow.

    Purpose of the Study:

    • To evaluate the influence of different inhalational agents on intestinal circulation.
    • To compare the effects of nitrous oxide, halothane, enflurane, and isoflurane on intestinal vascular resistance and blood flow.

    Main Methods:

    • An isolated intestinal loop preparation in 60 dogs was used.
    • Rubidium clearance and microsphere entrapment were employed to assess blood flow and shunting.
    • Vascular resistance, flow, and oxygen uptake were measured under various anesthetic conditions.

    Main Results:

    Related Experiment Videos

    • Nitrous oxide and isoflurane increased intestinal vascular resistance and decreased blood flow compared to pentobarbital.
    • Halothane at 2 MAC decreased vascular resistance and increased blood flow.
    • Enflurane showed minimal differences in vascular resistance and flow compared to pentobarbital.
    • Alpha-adrenoceptor blockade abolished isoflurane-induced vasoconstriction, indicating a role for catecholamines.

    Conclusions:

    • Inhalational agents have distinct effects on intestinal circulation.
    • Nitrous oxide and isoflurane cause intestinal vasoconstriction, while halothane causes vasodilation.
    • The vasoconstrictive effect of isoflurane is mediated by alpha-adrenoceptors and circulating catecholamines.