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Autonomic dysfunction in primary Raynaud's phenomenon.

M Koszewicz¹, I Gosk-Bierska, M Bilińska

¹Department of Neurology, Medical University of Wrocław, Wrocław, Poland. magda.koszewicz@onet.pl

International Angiology : a Journal of the International Union of Angiology

|April 16, 2009

Summary

This summary is machine-generated.

Primary Raynaud's phenomenon patients show sympathetic dysregulation and impaired parasympathetic heart modulation. Autonomic nervous system impairment may originate centrally, affecting heart rate variability.

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Area of Science:

Neurology
Cardiology
Autonomic Neuroscience

Background:

The exact cause of Raynaud's phenomenon remains elusive, with neural and vascular factors implicated.
The role of the autonomic nervous system, particularly sympathetic over-activity, is a key area of investigation.

Purpose of the Study:

To conduct a clinical and electrophysiological assessment of autonomic nervous system function in individuals with primary Raynaud's phenomenon.

Main Methods:

Evaluated 34 primary Raynaud's patients and 31 controls using neurological exams, questionnaires, orthostatic and handgrip tests.
Assessed nerve conduction velocity, sympathetic skin response (SSR), and heart rate variability (HRV) via deep breathing and resting spectral analysis.

Main Results:

While standard nerve tests were normal, 82% of patients reported dysautonomia via questionnaire.
Patients exhibited significantly lower resting heart rate variability (HRV) and a predominance of low-frequency bands in HRV spectrum analysis compared to controls.

Conclusions:

Primary Raynaud's patients demonstrate sympathetic dysregulation and reduced parasympathetic modulation of heart function.
Findings suggest a potential central impairment of autonomic function in primary Raynaud's phenomenon, though peripheral nerve involvement is uncertain.