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Biochemical changes in two subjects succumbing to syncope.

A J Vingerhoets

    Psychosomatic Medicine
    |March 1, 1984
    PubMed
    Summary

    Fainting involves a rapid sequence of fight-flight and conservation-withdrawal stress reactions. Biochemical analysis revealed low heart rate and noradrenaline, but high human growth hormone, cortisol, and glucose post-faint.

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    Area of Science:

    • Psychophysiology
    • Neuroendocrinology
    • Human Physiology

    Background:

    • Fainting (syncope) is a complex physiological response.
    • Previous studies suggest psychological factors precede fainting episodes.
    • Limited biochemical data exists on the immediate post-faint state.

    Purpose of the Study:

    • To investigate the biochemical changes following fainting during a psychophysiological experiment.
    • To correlate physiological and biochemical responses with the onset of syncope.

    Main Methods:

    • Biochemical analysis of blood samples from two subjects post-fainting.
    • Measurement of heart rate, plasma noradrenaline, glucose, human growth hormone, and cortisol.
    • Comparison of post-faint values with control data.

    Main Results:

    • Subjects exhibited low heart rate and plasma noradrenaline levels post-faint.
    • Elevated levels of glucose, human growth hormone, and cortisol were observed.
    • Heart rate normalized within approximately 45 minutes.

    Conclusions:

    • The findings suggest a dual stress response mechanism during fainting.
    • Fainting may involve an initial fight-flight response followed by a conservation-withdrawal response.
    • These biochemical shifts provide insights into the pathophysiology of syncope.

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