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Vascular adrenergic interactions during hemorrhagic shock.

R F Bond, G Johnson

    Federation Proceedings
    |February 1, 1985
    PubMed
    Summary

    Severe hemorrhage causes cardiovascular imbalance, leading to reduced blood pressure. Compensatory vasoconstriction involves alpha 1 and extrasynaptic alpha 2 receptors, influencing survival after blood loss.

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    Area of Science:

    • Cardiovascular Physiology
    • Hemorrhage Pathophysiology
    • Adrenergic Receptor Pharmacology

    Background:

    • Severe hemorrhage disrupts the cardiovascular system, causing a critical drop in blood volume and mean arterial pressure (MAP).
    • This imbalance triggers compensatory mechanisms involving the sympathetic nervous system and hormonal responses.
    • Understanding these vascular events is crucial for managing hemorrhagic shock.

    Purpose of the Study:

    • To review the sequence of vascular events following severe hemorrhage.
    • To elucidate the role of adrenergic receptors in the compensatory vasoconstriction response.
    • To explore factors influencing vascular decompensation in skeletal muscle post-hemorrhage.

    Main Methods:

    • Review of existing literature on vascular events after hemorrhage.
    • Analysis of the roles of epinephrine and norepinephrine in vasoconstriction.
    • Classification of adrenoreceptors (alpha 1, presynaptic alpha 2, extrasynaptic alpha 2) using pharmacological blocking agents.

    Main Results:

    • Hemorrhage leads to reduced cardiac output and MAP, activating sympathetic response.
    • Epinephrine and norepinephrine interact with alpha 1 and extrasynaptic alpha 2 receptors to initiate vasoconstriction.
    • Presynaptic alpha 2 receptors and prostaglandin E inhibit norepinephrine release, potentially causing vascular decompensation.

    Conclusions:

    • Compensatory vasoconstriction is mediated by alpha 1 and extrasynaptic alpha 2 adrenoreceptors.
    • Autoinhibition via presynaptic alpha 2 receptors may contribute to skeletal muscle vascular decompensation.
    • Survival after hemorrhage may depend on the balance of specific adrenoreceptor activity during the initial response.

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