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F-response multiplicity in lower motor neuron disorders
1Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India.
Electromyography and Clinical Neurophysiology
|October 1, 1996
Summary
Multiple F-responses, a rare finding in lower motor neuron disorders, indicate disease presence. This electrophysiological phenomenon was not observed in healthy individuals or those with upper motor neuron conditions.
Area of Science:
- Neurology
- Electrophysiology
Background:
- The F-response is a key electrophysiological measure in neurological assessments.
- Understanding variations in F-response can aid in diagnosing motor neuron diseases.
Purpose of the Study:
- To investigate the phenomenon of multiple F-responses (F-multiplicity).
- To determine the association of F-multiplicity with lower motor neuron disorders.
Main Methods:
- Supramaximal distal nerve stimulation was applied to patients and healthy subjects.
- F-responses were analyzed for multiplicity, latency, and morphology.
- Comparisons were made between patients with lower motor neuron disorders, upper motor neuron disorders, and healthy controls.
Main Results:
- F-multiplicity was observed in approximately 4% of patients with lower motor neuron disorders, including poliomyelitis, entrapment neuropathies, axonopathies, and demyelinating neuropathies.
- No F-multiplicity was detected in 30 healthy subjects or 30 patients with upper motor neuron disorders.
- Repeated stimulation confirmed the reproducibility of multiple F-response components.
- Increased repeater F-responses and chronodispersion were consistently associated with F-multiplicity.
Conclusions:
- F-multiplicity is a novel electrophysiological phenomenon.
- The presence of F-multiplicity is a reliable indicator of lower motor neuron disease.
- This finding offers a new diagnostic marker in neurophysiological assessments.