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Primary neurogenic orthostatic hypotension.

R C Hughes, N E Cartlidge, P Millac

    Journal of Neurology, Neurosurgery, and Psychiatry
    |June 1, 1970
    PubMed
    Summary

    Neurogenic orthostatic hypotension involves autonomic dysfunction, sometimes with central nervous system degeneration. Diagnostic tests confirm circulatory reflex breakdown and neurogenic lesions.

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    Area of Science:

    • Neurology
    • Cardiology
    • Autonomic Neuroscience

    Background:

    • Neurogenic orthostatic hypotension (NOH) presents with a significant drop in blood pressure upon standing.
    • Autonomic dysfunction is a key feature, often associated with central nervous system (CNS) degeneration.

    Purpose of the Study:

    • To describe eight additional cases of NOH.
    • To investigate the clinical presentation, pathology, and diagnostic markers of NOH.
    • To highlight challenges in diagnosing NOH due to variable presentations.

    Main Methods:

    • Clinical case series description.
    • Necropsy study of one case.
    • Physiological testing including Valsalva maneuver, vasopressor response, sweating response to heating, and pilo-erector response to acetylcholine.

    Main Results:

    • Three cases showed isolated autonomic dysfunction; five had concurrent CNS degeneration (Parkinsonism, ataxia, dementia, etc.).
    • Abnormal Valsalva response and normal vasopressor response were invariable, indicating a neurogenic lesion.
    • Loss of sweating suggested a central or efferent defect, while a normal pilo-erector response indicated a preganglionic lesion.

    Conclusions:

    • NOH can manifest with isolated autonomic failure or combined CNS degeneration.
    • Specific physiological tests reliably identify neurogenic lesions and circulatory reflex breakdown.
    • Variable clinical presentations often delay diagnosis, emphasizing the need for careful assessment.

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