Correlations between MUNIX and adapted multiple point stimulation MUNE methods

Area of Science:

• Neurophysiology
• Neuromuscular disorders

Background:

• Motoneurone disorders (MND) involve progressive loss of motor neurons.
• Accurate assessment of motor unit loss is crucial for diagnosis and monitoring.
• The motor unit number index (MUNIX) and adapted multiple point stimulation (AMPS) are electrophysiological techniques used to evaluate motor units.

Purpose of the Study:

• To evaluate the relationship between the motor unit number index (MUNIX) and the adapted multiple point stimulation (AMPS) technique.
• To assess the utility of MUNIX and AMPS in identifying motor unit loss in patients with suspected motoneurone disorders.

Main Methods:

• Prospective study involving 20 patients with suspected motoneurone disorders.
• Application of MUNIX and AMPS techniques to the thenar muscles.
• Clinical and paraclinical assessment to confirm diagnosis (MND/ALS or no disease).

Main Results:

• Both AMPS and MUNIX values were significantly lower in patients diagnosed with motoneurone disorders (MND) compared to those without.
• A strong, significant positive linear correlation was observed between AMPS and MUNIX values (R=0.83, p<0.01).
• The study included 13 patients with MND (9 with ALS) and 7 patients without neurological disease.

Conclusions:

• Both MUNIX and AMPS serve as reliable markers for documenting motor unit loss.
• The findings support the reliability and clinical utility of the MUNIX technique in assessing neuromuscular conditions.