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Stapedial muscle electromyography in various diseases
Archives of Otolaryngology--Head & Neck Surgery
|April 1, 1987
Summary
Stapedial muscle electromyograms (SEMGs) help diagnose facial nerve issues. Prolonged SEMG latency indicates incomplete facial palsy, while normal results suggest intact facial nerve function.
Area of Science:
- Neurology
- Otolaryngology
- Neurophysiology
Background:
- Stapedial muscle electromyograms (SEMGs) are derived from electrocochleography.
- SEMGs assess facial nerve function, particularly in relation to the stapedial reflex (SR).
Observation:
- SEMGs were evaluated in patients with diverse neurological and otological conditions.
- Latency and waveform characteristics of SEMGs were analyzed in relation to stapedial reflex presence and amplitude.
Findings:
- Prolonged SEMG latency was observed in incomplete facial palsy (Bell's palsy, cerebellopontine angle tumor), often with diminished or absent SR.
- Normal SEMG waveforms and latencies were noted in Meniere's disease and sensorineural hearing loss.
- In otitis media with effusion, SEMGs were recordable with normal parameters despite the absence of SR.
Implications:
- SEMGs are a valuable tool for differentiating facial nerve dysfunction.
- Normal SEMG findings correlate with intact facial nerve function.
- Abnormal SEMG latency is a sensitive indicator of incomplete facial nerve paralysis.