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Electrically evoked auditory potentials: comparison between transtympanic promontory and round-window stimulations
Elisabeth Sauvaget1, Yann Péréon, Sylvie Nguyen The Tich
1Service d'ORL et de chirurgie cervico-faciale, Hôtel-dieu, Nantes, France. esauvaget@netcourrier.com
Neurophysiologie Clinique = Clinical Neurophysiology
|November 27, 2002
Summary
Transtympanic promontory stimulation is a less invasive and effective method for assessing auditory nerve excitability in deaf patients before cochlear implantation compared to round-window stimulation.
Area of Science:
- Otolaryngology
- Neuroscience
- Audiology
Background:
- Electrically evoked auditory potential (eEAP) techniques assess auditory nerve excitability.
- These techniques are crucial for patient selection before cochlear implantation.
Purpose of the Study:
- To compare eEAPs recorded via transtympanic promontory stimulation (TPS) versus round-window stimulation (RWS).
- To evaluate the efficacy and invasiveness of each stimulation method for cochlear implant candidacy.
Main Methods:
- eEAPs were recorded from 10 deaf patients (14 ears) undergoing cochlear implantation evaluation.
- Stimulation was applied via both transtympanic promontory and round-window approaches.
Main Results:
- eEAPs were successfully recorded in 93% of ears with TPS and 79% with RWS.
- Both methods yielded similar waveforms, latencies, thresholds, and amplitudes.
- TPS demonstrated a higher success rate.
Conclusions:
- Both TPS and RWS provide valuable objective data for pre-cochlear implantation patient selection.
- TPS is preferred due to its less invasive nature and lack of need for surgical exposure, making it more suitable for clinical practice.