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Waveform reliability with different recording electrode placement in facial electroneuronography
Won-Ho Chung1, Jong-Chan Lee, Do Yeon Cho
1Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
The Journal of Laryngology and Otology
|August 3, 2004
Summary
For facial nerve palsy diagnosis, placing the electroneuronography (ENoG) recording electrode on the nasal ala yields a lower threshold and clearer waveforms compared to the nasolabial fold.
Area of Science:
- Neurology
- Clinical Electrophysiology
Background:
- Electroneuronography (ENoG) is crucial for assessing facial nerve palsy severity and prognosis.
- ENoG results can be affected by electrode placement, with nasolabial fold and nasal ala being common sites.
Purpose of the Study:
- To compare waveform quality and key parameters of ENoG recordings using nasal ala versus nasolabial fold electrode placement.
- To determine the optimal electrode position for reliable ENoG in facial nerve palsy assessment.
Main Methods:
- Compared ENoG waveforms from nasal ala and nasolabial fold placements in 20 healthy volunteers and 25 patients with facial nerve palsy.
- Assessed supramaximal threshold, waveform amplitude/shape, interside difference, and test-retest variability.
Main Results:
- No significant differences in amplitude, interside difference, or test-retest variability were found between the two electrode sites.
- Nasal ala placement resulted in a significantly lower threshold and a higher incidence of ideal biphasic waveforms (97.5% in controls).
- Waveform identification was easier with the nasal ala electrode placement.
Conclusions:
- Nasal ala electrode placement is recommended for ENoG recordings due to improved waveform clarity and lower stimulation thresholds.
- This preferred method enhances the reliability and diagnostic accuracy of ENoG in evaluating facial nerve palsy.