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Facial nerve action potentials: a study to assess waveform reliability.
1Department of Otolaryngology, Manchester Royal Infirmary, UK.
The American Journal of Otology
|November 15, 2000
Summary
The orthodromic facial nerve action potential (FNAP) is a reliable method for assessing facial nerve function, showing high reliability comparable to compound muscle action potentials (CMAPs). This technique provides valid data for clinical use.
Area of Science:
- Neurosurgery
- Neurology
- Audiology
Background:
- Facial nerve action potential (FNAP) assessment is crucial for evaluating facial nerve function.
- Reliability of intratemporal FNAP recording requires validation.
Purpose of the Study:
- To assess the reliability of orthodromic facial nerve action potential (FNAP) recordings.
- To compare FNAP reliability with compound muscle action potentials (CMAPs).
Main Methods:
- Prospective study involving 10 patients undergoing vestibular schwannoma resection.
- Recorded intratemporal FNAPs and simultaneous CMAPs.
- Assessed test-retest reliability of both waveforms.
Main Results:
- FNAP amplitudes were larger than CMAP amplitudes (2.60 mV vs. 1.07 mV).
- CMAPs showed less variability in replicate and test-retest error.
- FNAPs demonstrated higher subject variance but superior overall reliability (0.995 vs. 0.982).
Conclusions:
- Orthodromic FNAP, recorded intratemporally, is a reliable waveform.
- This technique is a valid method for assessing facial nerve function.
- FNAP offers a dependable measure for intraoperative facial nerve monitoring.