Quantitative sensory test for primary restless legs syndrome/Willis-Ekbom disease using the current...

Area of Science:

• Neurology
• Sleep Medicine
• Sensory Physiology

Background:

• Restless Legs Syndrome/Willis-Ekbom Disease (RLS/WED) is a neurological disorder characterized by sensory disturbances, often worsening at night.
• Understanding the diurnal pattern of sensory dysfunction in RLS/WED is crucial for diagnosis and management.

Purpose of the Study:

• To investigate diurnal sensory dysfunction in primary RLS/WED patients.
• To compare sensory perception thresholds between RLS/WED patients and healthy controls using the current perception threshold (CPT) test.

Main Methods:

• Thirty RLS/WED patients and 30 healthy controls underwent CPT testing using the Neurometer® system at different frequencies (2000 Hz, 250 Hz, 5 Hz).
• Testing was performed twice: once during the asymptomatic daytime and again in the symptomatic evening.
• Peripheral polyneuropathy was excluded through neurological examination and nerve conduction studies.

Main Results:

• No significant difference in CPT was observed between RLS/WED patients and controls during the daytime.
• RLS/WED patients demonstrated significantly lower CPT values across all tested frequencies in the evening compared to controls.
• Healthy controls showed no significant diurnal variation in CPT.

Conclusions:

• RLS/WED patients exhibit reduced sensory perception thresholds in the evening, suggesting a diurnal hyperalgesia.
• This diurnal variation points towards a central (circadian) sensory processing disturbance rather than a peripheral issue in RLS/WED.