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H reflex studies in neurolathyrism
1Department of Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India.
Electroencephalography and Clinical Neurophysiology
|August 1, 1994
Summary
H reflex studies in lathyrism patients reveal increased motor neuron excitability. Abnormalities in the H reflex pathway suggest altered neural transmission, independent of spasticity or weakness.
Area of Science:
- Neuroscience
- Neurology
- Motor Neuron Diseases
Background:
- Lathyrism, a neurodegenerative disorder, is characterized by spasticity and weakness.
- Motor neuron excitability changes are implicated in spasticity but require further investigation.
Purpose of the Study:
- To investigate motor neuron excitability in lathyrism patients using H reflex studies.
- To identify specific H reflex pathway abnormalities associated with lathyrism.
Main Methods:
- H reflex studies were conducted on sixteen lathyrism patients (18-55 years old).
- Assessment included measuring H reflex parameters, vibratory inhibition, and reciprocal inhibition.
- H reflex recovery curves were analyzed in a subset of patients.
Main Results:
- Increased H-reflex motor neuron (HM) ratio indicated heightened motor neuron excitability.
- Lack of vibratory inhibition suggested altered premotoneuronal transmission.
- Absence of reciprocal inhibition (P < 0.01) was observed.
- H reflex abnormalities were not correlated with spasticity, weakness, or plantar response.
Conclusions:
- Lathyrism is associated with increased motor neuron excitability and altered H reflex pathway transmission.
- Findings suggest dysfunction in interneuronal circuits modulating motor neuron activity.
- H reflex studies provide valuable insights into the pathophysiology of lathyrism.