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Related Experiment Video

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Autonomic dysfunction in chronic persistent dizziness.

Hyung Lee1, Hyun-Ah Kim1

  • 1Department of Neurology, Keimyung University School of Medicine, Daegu, Republic of Korea; Brain Research Institute, Keimyung University School of Medicine, Daegu, Republic of Korea.

Journal of the Neurological Sciences
|July 12, 2014
PubMed
Summary
This summary is machine-generated.

Autonomic dysfunction is common in chronic persistent dizziness. Studies show sympathetic failure or hyperactivity may cause this condition, even without orthostatic symptoms.

Keywords:
Autonomic nervous systemChronic diseaseDizzinessSympathetic nervous system diseasesTilt-table testValsalva maneuver

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Area of Science:

  • Neurology
  • Cardiology
  • Autonomic Nervous System Research

Background:

  • Chronic persistent dizziness affects quality of life.
  • Identifying underlying causes of dizziness is crucial for effective treatment.
  • Autonomic nervous system dysfunction is a potential, yet under-investigated, cause of dizziness.

Purpose of the Study:

  • To investigate autonomic dysfunction in patients experiencing chronic persistent dizziness.
  • To identify specific patterns of autonomic abnormalities associated with persistent dizziness.

Main Methods:

  • Prospective recruitment of 18 patients with chronic persistent dizziness.
  • Exclusion of other potential causes through extensive investigations.
  • Standardized autonomic function testing, including head-up tilt (HUT) test, Valsalva maneuver (VM), and heart rate (HR) response to deep breathing.

Main Results:

  • Eighty percent of patients exhibited at least one autonomic test abnormality.
  • Two primary patterns identified: sympathetic failure (e.g., BP drop during HUT) and sympathetic hyperactivity (e.g., exaggerated HR response during HUT or VM).
  • Specific indicators for sympathetic failure and hyperactivity were detailed based on test results.

Conclusions:

  • Autonomic dysfunction is frequently observed in patients with chronic persistent dizziness.
  • Sympathetic failure or hyperactivity are potential etiological factors for persistent dizziness.
  • Clinicians should consider autonomic dysfunction in patients with persistent dizziness, irrespective of orthostatic symptoms.