Reinnervation and Neuromuscular Transmission in ALS

Last updated: August 6, 2024
Sponsor: University of Aarhus
Overall Status: Active - Recruiting

Phase

N/A

Condition

Amyotrophic Lateral Sclerosis (Als)

Myasthenia Gravis (Chronic Weakness)

Scar Tissue

Treatment

Observational study

Clinical Study ID

NCT06219759
8340
1-10-72-153-23
  • Ages > 18
  • All Genders
  • Accepts Healthy Volunteers

Study Summary

The aim of this study is to describe the changes in the neuromuscular connection in patients with amyotrophic lateral sclerosis (ALS). The study consist of three substudies that have the following main hypothesis:

  1. that ALS patients do not demonstrate equal capacity for muscle reinnervation and that reinnervation preserves muscle function and thereby slows down progression.

  2. that blood concentrations of c-terminal agrin fragment (bCAF) reflect neuromuscular transmission deficiency and that blood concentration of neural cell adhesion molecule reflects degree of muscle denervation in patients.

  3. that ALS patients with decrement when examined with repetitive nerve stimulation have more physical fatigue, slower progression, higher degree of reinnervation and higher bCAF compared to ALS patients without decrement.

There will be 3 inclusion groups.

  1. patients referred for neurophysiological examination on suspicion of motor neuron disease.

  2. healthy controls

  3. disease control: patients with another motor neuron disease with slow progression.

All participants will be invited for at least 1 visit (baseline). If participants in group 1 eventually receive the diagnosis of ALS they will be invited for 2 additional visits 4 og 8 months after baseline visit, respectively.

Examinations will consist of:

  • nerve conduction study

  • repetitive nerve stimulation (except for healthy controls) to examine impairment of the neuromuscular connection.

  • motor unit number estimation with MScanFit to estimate number and size of motor units.

  • ultrasound examination of muscles to measure size and condition of muscles.

  • questionnaires on fatigue and functional status.

  • blood sample for measurement of specialized analysis (c-terminal agrin fragment and neural cell adhesion molecule) and routine analysis (liver and kidney function as well as neurofilament light chain)

  • muscle strength assessment manually and by dynamometer to follow progression of muscle weakness

  • bioelectrical impedance measurement to follow the overall body composition.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  • Referred to clinical neurophysiological examination on suspicion of motor neurondisease or diagnosed with ALS according to Gold Coast criteria within the last 3months.

  • Age ≥18 years old

  • Able and willing to provide informed consent

Exclusion

Exclusion Criteria:

  • Former central or peripheral nervous system disease

  • Diabetes

  • Electrophysiological signs of polyneuropathy at baseline visit

  • Pacemaker

  • Pregnancy

For disease controls the exclusion criteria are the same, but the inclusion criteria:

  • Diagnosed with disease with slow, progressive loss of motor neurons

  • Age ≥18 years old

  • Able and willing to provide informed consent

Study Design

Total Participants: 120
Treatment Group(s): 1
Primary Treatment: Observational study
Phase:
Study Start date:
May 17, 2024
Estimated Completion Date:
December 31, 2026

Connect with a study center

  • Department of Neurology, Aarhus University Hospital

    Aarhus, Region Midtjylland 8200
    Denmark

    Active - Recruiting

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