Related Experiment Videos
Sensory-motor conduction time in amyotrophic lateral sclerosis
E Facco1, G Micaglio, M C Liviero
1Istituto di Anestesiologia e Rianimazione, Università di Padova.
Rivista Di Neurologia
|May 1, 1989
Summary
Motor evoked potentials (MEP) and F-waves in amyotrophic lateral sclerosis (ALS) patients revealed significant delays, indicating upper motor neuron dysfunction. Some patients also exhibited combined sensory and motor pathway abnormalities.
Area of Science:
- Neuroscience
- Clinical Electrophysiology
Background:
- Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease primarily affecting motor neurons.
- Understanding the electrophysiological abnormalities in ALS is crucial for diagnosis and prognosis.
Purpose of the Study:
- To investigate the utility of motor evoked potentials (MEP) and F-waves in assessing upper motor neuron involvement in ALS patients.
- To evaluate somatosensory evoked potentials (SEP) in the same patient cohort.
Main Methods:
- 19 ALS patients underwent MEP and F-wave recordings from thenar muscles.
- 16 of these patients also had SEP recorded from the median nerve.
- Analysis focused on latency, conduction time, and wave presence/absence.
Main Results:
- MEP were absent in 21% bilaterally and 3.6% unilaterally.
- Recordable MEP and F-waves showed significant delays.
- SEP revealed delayed N9-N13 intervals, while N13-N20 remained normal.
- Four patients presented with combined sensory-motor dysfunction.
Conclusions:
- MEP and F-wave abnormalities are common in ALS, suggesting upper motor neuron involvement.
- SEP can detect sensory pathway involvement, particularly in the early spinal-to-cortical segments.
- Combined sensory-motor dysfunction may represent a distinct subtype or progression pattern in ALS.