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[Neurovegetative function tests: clinical importance and physiological aspects]

J J Grimm, F Regli

    Schweizerische Medizinische Wochenschrift
    |May 9, 1981
    PubMed
    Summary
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    This study details five non-invasive cardiovascular tests for evaluating autonomic nervous system defects in neurological conditions. Reference values for heart beat to beat variation are proposed for healthy individuals.

    Area of Science:

    • Neurology
    • Cardiovascular Physiology
    • Autonomic Nervous System

    Context:

    • Autonomic nervous system (ANS) dysfunction is increasingly recognized in polyneuropathies and central nervous system diseases.
    • Accurate assessment of ANS function is crucial for diagnosing and managing these neurological conditions.
    • Non-invasive cardiovascular tests offer a practical approach to evaluating autonomic defects.

    Purpose:

    • To describe five simple, non-invasive cardiovascular tests for assessing autonomic defects.
    • To discuss the physiological mechanisms underlying each test.
    • To establish reference values for beat-to-beat heart rate variation in healthy subjects.

    Summary:

    • Five non-invasive cardiovascular tests are presented: orthostatic tests (blood pressure changes, Ewing's test), Valsalva maneuver, sustained handgrip, and beat-to-beat heart rate variation.

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  • The physiological basis, effector organ considerations (cardiovascular system), and medication effects for each test are examined.
  • Beat-to-beat variation, quantified by coefficient of variation and meansquare successive difference, provides reference values from 32 healthy individuals.

    • Impact:

    • Provides clinicians with practical tools for diagnosing autonomic dysfunction in neurological disorders.
    • Establishes normative data for beat-to-beat heart rate variation, aiding in the interpretation of test results.
    • Highlights the importance of considering cardiovascular system integrity and medication effects in autonomic testing.