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Barbiturates and aortic and venous smooth-muscle function.

B T Altura, B M Altura

    Anesthesiology
    |October 1, 1975
    PubMed
    Summary
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    Barbiturates inhibit vascular smooth muscle activity and contractions by affecting calcium movement. Rat portal veins are more sensitive than aortic strips to these effects.

    Area of Science:

    • Pharmacology
    • Vascular Biology
    • Smooth Muscle Physiology

    Background:

    • Barbiturates are commonly used for anesthesia and anticonvulsive therapy.
    • Vascular smooth muscle plays a crucial role in regulating blood pressure and flow.

    Purpose of the Study:

    • To investigate the effects of various barbiturates on rat aortic and portal venous smooth muscle.
    • To elucidate the mechanisms underlying barbiturate-induced vascular smooth muscle relaxation and inhibition.

    Main Methods:

    • Isolated rat aortic strips (AS) and portal veins (PV) were used.
    • Experiments involved assessing spontaneous activity, agonist-induced contractions (epinephrine, K+), and calcium-induced contractions.
    • Dose-response curves were analyzed to determine the nature of barbiturate interactions.

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    Main Results:

    • All studied barbiturates inhibited spontaneous vasomotion and attenuated agonist- and Ca++-induced contractions in AS and PV.
    • Barbiturates caused non-competitive shifts in dose-response curves, suggesting interference with calcium pathways.
    • Rat portal venous smooth muscle exhibited greater sensitivity to barbiturates than aortic smooth muscle.
    • Thiopental uniquely induced dose-dependent contractions in aortic strips.

    Conclusions:

    • Barbiturates exert depressant effects on vascular smooth muscle, potentially through modulation of calcium (Ca++) movement.
    • These findings are relevant at anesthetic and anticonvulsant concentrations, impacting vascular function.
    • Differences in sensitivity exist between aortic and portal venous smooth muscle.