Analysis of Sympathetic Activity in Willis-Ekbom Disease

Restless Legs Syndrome Clinical Trial

— MIBG-RLS  

Official title:

Analysis of Sympathetic Activity in Willis-Ekbom Disease

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT02929732
• Other study ID #: 9689
• Status: Recruiting
• Phase: N/A
• Start date: March 21, 2017
• Est. completion date: October 5, 2025

Study information

• Verified date: May 2024
• Source: University Hospital, Montpellier
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Willis-Ekbom disease (WED), also known as restless legs syndrome (RLS) is a common neurological sensorimotor disorder that typically impairs sleep and quality of life, likely consequent to a central dopaminergic dysfunction associated to brain iron deficiency. Periodic limb movements (PLMS) in sleep are present in 80% of patients with WED. PLMS are often associated with micro-arousals that contribute to sleep fragmentation and repeated increases of blood pressure and heart rate throughout the night, thus representing an increased risk for hypertension and cardiovascular diseases (CVD).

Willis-Ekbom disease affects people with higher cardiovascular risk factors, such as advanced age, obesity, diabetes mellitus and hypercholesterolemia. However, previous observational, cross-sectional or longitudinal population-based studies on the association between RLS and CVD and hypertension showed controversial results.

While the pathophysiology of RLS is yet to be elucidated and is likely multifactorial, one theory involves a reduction in dopaminergic outflow to the preganglionic sympathetic neurons in the dorsal horn of the spinal cord. Dopamine inhibits preganglionic sympathetic neurons, therefore a reduction in dopamine may in turn increase sympathetic outflow.

Based on this notion, the investigators hypothesize an increase of sympathetic autonomic activity in Willis-Ekbom disease responsible for the recurrent increase in blood pressure and heart rate during sleep, which may play a role in increasing the risk of cardiovascular diseases.

The aim of this study is to analyze the autonomic nervous activity in patients with WED compared to healthy volunteers controls. The investigators will measure primarily the cardiac sympathetic activity by the 123I-metaiodobenzylguanidine (123I-MIBG) scintigraphy and secondarily the sympathetic nerve activity by the plasmatic pro inflammatory biomarkers and urinary catecholamine levels and the circadian variation of blood pressure and heart rate as assessed by the 24-hour ambulatory blood pressure monitoring.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 40
• Est. completion date: October 5, 2025
• Est. primary completion date: October 5, 2025
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 74 Years

Eligibility

Inclusion Criteria:

• Non-specific inclusion criteria (CASE + CONTROL)

• 18 years-old or more, and less than 75 years-old

• French-speaking

• able to understand the study

• signed written informed consent

• affiliated to social security

• CASE-specific inclusion criteria

• 5 " International RLS Study Group (IRLSSG) 2012 " positive criteria

• RLS severity scale (IRLS) score = 15

• ferritin > 50 ng/ml

• periodic limb movements index > 10/hour

• idiopathic (or primary) Willis-Ekbom disease not treated with dopaminergic agonists or pregabalin or gabapentin in the last 8 days, at least 3 years of disease duration with symptoms recurring at least 3 times a week

Exclusion Criteria:

• Non-specific exclusion criteria (CASE + CONTROL)

• vulnerable subject : subject deprived of liberty or protected by law (trusteeship, legal guardianship), pregnant or breastfeeding woman

• exclusion period after other research protocol

• malignant neoplastic disease treated in the last 12 months

• medical history of cardiovascular disease (ischemic heart disease, heart failure, stroke, hypertension, sleep apnea syndrome)

• antidepressant, neuroleptic, sympathomimetic, sympatholytic, vasculotropic, dopamine agonists, opiate treatments

• CASE-specific exclusion criteria

• restless legs syndrome secondary to renal failure, hemochromatosis, neurologic disorders, iatrogenesis

• CONTROL-specific exclusion criteria - Willis-Ekbom Disease

Related Conditions & MeSH terms

• Restless Legs Syndrome
• Willis-Ekbom Disease

Intervention

Other:
• Sympathetic nervous activity measurement
Polysomnography, MIBG myocardic scintigraphy, and 24h blood pressure measurement

Locations

Country	Name	City	State
France	University Hospital of Montpellier	Montpellier

Sponsors (1)

Lead Sponsor	Collaborator
University Hospital, Montpellier

Country where clinical trial is conducted

France, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Cardiac sympathetic activity measurement by the 123I-metaiodobenzylguanidine (123I-MIBG) scintigraphy. Analysis of 123I-MIBG uptake based on the ratio heart/mediastinum		Day 0
Secondary	Cardiac sympathetic activity measurement by the 123I-metaiodobenzylguanidine (123I-MIBG) scintigraphy. Analysis of 123I-MIBG washout.		Day 0
Secondary	Analysis of circadian variations of blood pressure and heart rate assessed by the 24-hour ambulatory blood pressure monitoring		Day 0
Secondary	Measurement of pro inflammatory biomarkers and urinary catecholamines levels		Day 0
Secondary	5) Analysis of mean increases of blood pressure and heart rate based on sleep stages, micro-arousals, periodic limb movements and sleep apnoeas as measured by continuous non-invasive blood pressure monitoring		Day 0