Comparison of ls ce-chirp versus ce-chirp abr results in healty subjects

Chirps are acoustic stimuluses generated to increase the amplitudes arising from brain stem responses by increasing the neural syncronization. With the increase of response amplitudes, V. wave can be detected faster and easier and the duration of testing is shortened. CE-Chirp and LS CE-Chirp are stimuluses which are developed for this purpose. In this study, CE-Chirp and LS CE-Chirp stimulus responses are compared in ABR's. Material&Method This study is done by the confirmation of ethical committee approval in Baskent University hospital ENT clinic (Project no: KA17/164, Date of issue 26.07.2017, Decision no: 17/160). Work group was consist of 14 Woman (28 ears) and 9 Man (18 ears), with the age range of 18-40, normal hearing total of 23 subjects. All the subjects detailed anemnesis were taken, examined by ENT, audiometry and tympanometry testings were done showing no pathologies and then subjects were tested with ABR. ABR testing was performed with 80, 60, 40 and 20 dB nHL levels using CE-Chirp and LS CE-Chirp stimuluses. The results acquired were evaluated by statistical methods according to the distribution of the data. Results There were statistically significant differences with 80dB nHL CE-Chirp & LS CEChirp stimulus responses for I., III. & V. latencies and I. & III. amplitudes, but no statistically significance was observed for V. wave amplitude. At 80 dB nHL interpeak latency (I-III, III-V & I-V) differences were evaluated and there was no statistically viii significant difference for I-III, but for III-V & I-V statistically significance was observed. For the rest 60, 40 and 20 dB nHL levels, there were no statistically significant values for the all response latencies and amplitudes. Conclusion LS CE-Chirp stimulus is valuable for hearing threshold examination. Within this study, latency and amplitude responses were higher for LS CE-Chirp with high stimulus levels compared to CE-Chirp. For lower stimulus levels there was no significant supremecy in between two stimuluses and results acquired were complying with the literatüre Keywords: Auditory brainstem responses (ABR), CE-Chirp, LS CE-Chirp This study is held by the ethical committee permission of Başkent University Medicine & Health Sciences Research Committee (Project no: KA17/164, Date of issue 26.07.2017, Decision no: 17/160).