1st International Congress of the Mirko Tos Ear & Hearing Research Center and 4th International Congress of Istanbul Audiology, Edirne, Türkiye, 15 - 17 Ocak 2020, ss.62-77
Introduction: Behavioral methods and objective measurements are used to program the cochlear implant processor. Commonly used objective programming methods are eCAP(Electric Compound Action Potential), eSRT(Electric Stapedius Reflex Thresholds) and eABR(Electric Auditory Brainstem Response). The relatively less used eALR is an electrophysiological response formed by two positive and one negative peaks(P1-N1-P2) and can be measured using direct electrical stimulation. The aim of this study is to investigate the relationship between eSRT and eALR in cochlear implant users and to study if EALR can be used in difficult cases of cochlear implant programming where the behavioral response cannot be obtained. Methods: In this study, we have included 21 subjects older than 10 years old who used MED- EL Cochlear implant. Cochlear implant programming was performed in two different stages. In the first program, most comfortable levels (MCL) were determined by eSRT and threshold levels (THR) were determined by behavioral methods for all electrodes. In the second program, MCL and THR were determined by EALR for basal, medial and apical electrode and cochlear implant programming was performed on all electrodes according to these levels. With both programs, free field audiometry, speech audiometry and Cortical Auditory Evoked Potentials (CAEP) tests were performed. Conclusion: As a result of the tests performed after both programming methods; there was no significant difference in free field audiometry, speech audiometry, THR, MCL, and CAEP latency comparisons. We assume that EALR can be used as an objective test method in cochlear implant programming.