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Evoked electromyogram as a function of facial nerve
M S Roopakala1, Harmeet Singh, Rani Kanaka
1Department of Physiology, M.S. Ramaiah Medical College and Teaching Hospital, Bangalore.
Indian Journal of Physiology and Pharmacology
|July 17, 2004
Summary
Facial nerve integrity was assessed by recording muscle action potentials in the alae nasi. Amplitude emerged as the most reliable parameter for comparing nerve function between the left and right sides.
Area of Science:
- Neurology
- Electrophysiology
- Facial Nerve Studies
Background:
- Facial nerve integrity assessment is crucial for diagnosing neurological disorders.
- Electrophysiological methods, such as recording compound muscle action potentials (CMAPs), are used to evaluate nerve function.
- Standardized methods for comparing bilateral facial nerve function are needed.
Purpose of the Study:
- To compare latency, amplitude, and duration of CMAPs recorded from the alae nasi muscles bilaterally.
- To determine the most reliable parameter for assessing side-to-side facial nerve integrity.
Main Methods:
- Compound muscle action potentials (CMAPs) were recorded bilaterally from the alae nasi muscles.
- Stimulation of the facial nerve was performed in 45 healthy subjects aged 20-30 years.
- Analysis involved comparing latency, amplitude, and total duration of CMAPs between sides.
Main Results:
- A significant positive correlation was observed between latency, amplitude, and duration of CMAPs on both sides.
- Amplitude showed the highest correlation, indicating greater consistency for comparison.
- No significant differences were noted between the left and right sides in the healthy cohort.
Conclusions:
- Amplitude of CMAPs from the alae nasi is a superior parameter for evaluating facial nerve integrity bilaterally.
- This finding can aid in the accurate diagnosis and monitoring of facial nerve disorders.
- The study provides a basis for normative data in electrophysiological assessments of the facial nerve.