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Related Experiment Videos

Viscerally induced cutaneous vasospasm.

M Kushner, A Alavi

    Angiology
    |August 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Forearm superficial vasoconstriction, previously underestimated, was observed during saline infusion. This study reveals a potential autonomic reflex arc controlling forearm vascular tone.

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    Area of Science:

    • Physiology
    • Vascular Biology
    • Autonomic Nervous System

    Background:

    • Superficial forearm vasomotor tone is traditionally attributed to vasodilation.
    • The role of vasoconstriction in forearm superficial vascular tone is less understood.

    Purpose of the Study:

    • To investigate the existence and characteristics of forearm superficial vasoconstriction.
    • To explore the underlying mechanisms of observed vasoconstrictive phenomena.

    Main Methods:

    • Observational study during elective radial artery catheterization in normal subjects.
    • Intra-arterial infusion of normal saline at varying rates (0.5-6.0 ml/min) as a stimulus.
    • Monitoring for localized changes in forearm pallor and vasoconstriction.

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    Main Results:

    • A stable pericatheter zone of pallor was observed, proportional to saline infusion rate.
    • Distal patchy vasoconstriction appeared on the anterior forearm surface 5-10 seconds after increasing infusion rate.
    • These distal vasoconstrictive areas showed instability over time, suggesting a dynamic regulatory process.

    Conclusions:

    • Profound superficial vasoconstriction mechanisms exist in the forearm.
    • Observed distal vasoconstriction suggests the involvement of an autonomic vasomotor reflex arc.
    • Findings challenge the traditional view emphasizing vasodilation in forearm superficial vasomotor tone.