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Vasomotor abnormalities as post-polio sequelae: functional and clinical implications.

R L Bruno, J C Johnson, W S Berman

    Orthopedics
    |July 1, 1985
    PubMed
    Summary
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    Post-polio syndrome patients experience cold extremities and reduced muscle strength in cool temperatures due to impaired sympathetic vasoconstrictor outflow. This leads to excessive heat loss and abnormal nerve function.

    Area of Science:

    • Neurology
    • Physiology
    • Medical Science

    Background:

    • Individuals with a history of poliomyelitis often report cold extremities and decreased muscle strength when exposed to cooler temperatures.
    • These symptoms suggest potential underlying circulatory or neurological dysfunctions exacerbated by thermal stress.

    Purpose of the Study:

    • To investigate the physiological responses to cold exposure in individuals with post-polio syndrome.
    • To compare thermoregulatory and electrophysiological parameters between post-polio subjects and healthy controls.

    Main Methods:

    • Measurements of digital cutaneous blood flow, skin temperature, and median nerve electrophysiology (latencies and amplitudes) were taken at three ambient temperatures (30°C, 25°C, 20°C).
    • Five post-polio subjects and age-matched controls participated in the study.

    Related Experiment Videos

    Main Results:

    • Post-polio subjects exhibited lower cutaneous blood flow on the more affected side, though vasoconstriction response to cooling was similar bilaterally in both groups.
    • Decreasing ambient temperature led to abnormal median motor nerve latencies and "giant" sensory nerve potential amplitudes in a majority of post-polio subjects.
    • Impaired sympathetic vasoconstrictor outflow was observed in post-polio subjects, leading to passive dilatation of cutaneous venous capacitance beds.

    Conclusions:

    • Impaired sympathetic vasoconstrictor outflow in post-polio syndrome contributes to excessive heat loss and nerve/muscle cooling.
    • This cooling is responsible for the observed impairment in muscle function and abnormal electrophysiological findings in post-polio patients.
    • Findings suggest a link between autonomic dysfunction and the characteristic symptoms of post-polio syndrome.