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Related Experiment Videos

Sympathetic vascular function in patients with central dysautonomia.

L Santambrogio1, G Bellomo, M Mercuri

  • 1Institute of Clinica Medica II, University of Perugia Medical School, Italy.

Journal of Neural Transmission. Supplementum
|January 1, 1991
PubMed
Summary

Digital photoplethysmography (d-FPG) and cold pressor tests reveal autonomic nervous system (ANS) dysfunction in cerebral dysautonomia patients. These methods effectively assess ANS function and blood flow alterations non-invasively.

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Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function
  • Non-invasive Diagnostics

Background:

  • Cerebral dysautonomia is characterized by impaired autonomic nervous system (ANS) function.
  • Assessing ANS function non-invasively is crucial for diagnosis and management.
  • Skin blood flow and blood pressure patterns reflect ANS activity.

Purpose of the Study:

  • To investigate skin blood flow alterations using digital photoplethysmography (d-FPG) after cold exposure.
  • To evaluate post-prandial blood pressure patterns.
  • To assess sympathetic ANS function in patients with cerebral dysautonomia compared to healthy controls.

Main Methods:

  • Digital photoplethysmography (d-FPG) was performed on all ten fingers in basal conditions and after a cold pressor test (4-5°C).

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  • Photoplethysmographic wave amplitude, crest time, and inclination time were analyzed.
  • Post-prandial blood pressure was monitored non-invasively every 20 minutes after a standard meal.

    • Main Results:

    • Patients with cerebral dysautonomia showed increased d-FPG wave amplitude and decreased crest/inclination times post-cold exposure, unlike controls.
    • A marked fall in post-prandial systolic and diastolic blood pressure was observed in most patients.
    • These findings suggest disturbed blood vessel smooth muscle tone in ANS failure.

    Conclusions:

    • Digital photoplethysmography (d-FPG) combined with a cold pressor test is a valuable non-invasive tool for investigating ANS function.
    • The post-prandial blood pressure pattern also aids in assessing ANS function in dysautonomia.
    • These methods can help identify and understand autonomic dysfunction in cerebral dysautonomia.