Autonomic Nervous System Phenotyping Across Chronic Demyelinating Peripheral Neuropathies: A Comparative Study

Area of Science:

• Neurology
• Autonomic Neuroscience
• Clinical Research

Background:

• Autonomic nervous system (ANS) involvement is increasingly recognized in various peripheral neuropathies.
• Phenotyping ANS dysfunction is crucial for understanding disease mechanisms and clinical impact.

Purpose of the Study:

• To systematically evaluate and compare autonomic nervous system involvement across different peripheral neuropathy subtypes.
• To investigate the relationship between autonomic dysfunction and overall disability in these conditions.

Main Methods:

• Utilized the SCales for Outcomes in Parkinson's Disease-Autonomic Dysfunction (SCOPA-AUT) to assess autonomic symptoms.
• Employed established scales like MRC, INCAT, and ONLS for muscle strength and functional disability assessment.
• Included 343 participants: 98 with CIDP, 51 with MGUS-PNP, 51 with CMT1A, 18 with HNPP, and 125 healthy controls.

Main Results:

• Patients with CIDP, MGUS-PNP, and CMT1A demonstrated significantly higher SCOPA-AUT scores compared to healthy controls (p < 0.01).
• Observed distinct, disease-specific patterns of ANS symptoms across the neuropathy groups.
• Autonomic symptom burden was independently associated with overall disability in MGUS-PNP and CMT1A (p < 0.05).
• Active CIDP patients exhibited a greater autonomic symptom burden than inactive cases (p = 0.042).

Conclusions:

• CIDP, MGUS-PNP, and CMT1A patients present significant autonomic symptom burden with unique ANS profiles.
• Autonomic dysfunction is a relevant clinical feature in immune-mediated and hereditary neuropathies.
• Further research is needed to elucidate the clinical and prognostic implications of autonomic dysfunction in these neuropathies.