Complex fasciculation potentials and survival in amyotrophic lateral sclerosis

Area of Science:

• Neurology
• Electromyography

Background:

• Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease.
• Fasciculation potentials (FPs) are spontaneous muscle fiber potentials detected via electromyography (EMG).

Purpose of the Study:

• To investigate the prognostic value of complex fasciculation potentials (FPs) in amyotrophic lateral sclerosis (ALS) patients.
• To determine the relationship between the characteristics of FPs and patient survival.

Main Methods:

• Prospective needle EMG examination in 85 ALS patients across five to seven muscles.
• Analysis of FP morphology, classifying FPs with >4 phases as complex.
• Correlation analysis between complex FPs and survival using Cox proportional hazard models.

Main Results:

• Complex FPs were identified in 47 patients, often in muscles with normal strength or mild weakness.
• The presence of complex FPs was significantly associated with shorter survival (HR 3.055, p=0.004).
• An increased number of muscles exhibiting complex FPs correlated with reduced survival and accelerated disease progression.

Conclusions:

• Widespread complex FPs in ALS patients are linked to diminished survival.
• Complex FPs serve as a valuable biomarker for predicting ALS prognosis and should be routinely assessed during EMG.