What is it about?
In the past years, some groups established methods to use promontory stimulation and subjective responses as a tool for preoperative stimulation of the cochlea before cochlear implant (CI) surgery by a temporary trans-tympanic needle placed on the middle ear. Our research group tested CI candidates when the presence of the auditory nerve could not be confirmed by other pre-operative tests andanalyzed objective results of electrical auditory brainstem response recorded with trans-tympanic promontory stimulation in local anesthesia (LA-TT-EABR) with a “golf-club” electrode placed on the round window niche (Polterauer et al. 2018).
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Why is it important?
EABR recording suffers from an electrical artifact from the stimulation and focuses on the excitability of the solely auditory nerve. We hypothesize that late evoked potential response (EALR) can be used for the assessment of the auditory pathway up to the cortical area with less electrical artifact interference.
Perspectives
LA-TT-EALR may be a complement to the existing state-of-the-art LA-TT-EABR for pre-operative assessment before cochlear implantation offering information about auditory pathways in the auditory brainstem and cortexwith a small increase of recording time. The equivalency of these two methods is encouraging.
Dr. rer. biol. hum. Daniel Polterauer
Ludwig-Maximilians-Universitat Munchen
Read the Original
This page is a summary of: LA-TT-EALR / PromCERA: Comparison of preoperatively performed electrically evoked auditory potentials at the brainstem and cortical level during local anesthesia, Current Directions in Biomedical Engineering, August 2022, De Gruyter,
DOI: 10.1515/cdbme-2022-1060.
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