Autonomic dysfunction in non-paraneoplastic sensory neuronopathy: beyond sensory abnormalities

Area of Science:

• Neurology
• Peripheral Nervous System Disorders
• Autonomic Nervous System

Background:

• Sensory neuronopathies (SN) are increasingly recognized peripheral nervous system disorders.
• Autonomic dysfunction is a known but often underestimated complication of SN.

Purpose of the Study:

• To quantify autonomic function in patients with sensory neuronopathies.
• To assess the prevalence and characteristics of autonomic dysfunction in SN.
• To determine if autonomic dysfunction relates to specific SN etiologies.

Main Methods:

• Autonomic function was assessed using the Autonomic Tests Score (ATS) measuring sympathetic and parasympathetic function.
• Autonomic symptoms were evaluated using the 40-item Autonomic Questionnaire Score (AQS).
• Twenty SN patients were compared to age- and gender-matched controls.

Main Results:

• All SN patients reported autonomic dysfunction symptoms.
• 60% of patients exhibited abnormal cardiovagal tests and 60% had orthostatic hypotension.
• SN patients showed significantly impaired autonomic function compared to controls (ATS, p < 0.0001).

Conclusions:

• Autonomic dysfunction is a frequent and significant complication in sensory neuronopathies.
• The severity of autonomic dysfunction in SN does not appear to be linked to specific underlying causes.
• Comprehensive assessment of autonomic function is crucial for managing SN patients.