The comparison of ce-chirp abr and click abr findings with the men at A certain age who have total hearing loss in one ear and normal hearing in the other ear

The aim of this study was to compare the human ABR elicited by Clicks and CE-Chirps in single-sided deaf participants' both normal and impaired ears. A recent advance in the ABR recording has been the use of chirp stimuli, which is formulated to address the inherent time delay of the cochlea's travelling wave characteristics. CE-Chirp stimulus designed bye Claus Elberling (2007). We conducted a cross-sectional analytic study of 71 male (19 to 25 years old) military recruits admitted with single-sided deafness (SSD) in one ear and normal hearing in the other to İzmir Military Hospital from February 2014 to October 2014. A comparison was made between recordings made with Click and CE-chirp in both normal and deaf ears. The amplitude and latency normative parameters of the Click and CE-Chirp ABR were also determined for the young men aged 19-25 years. In our study, the childhood mumps was the most frequent cause of SSD. The Stenger test was administered and it correctly identified %100 of the 71 individuals. In accordance with other studies, our study indicates that the Stenger test is a powerfully reliable test to confirm profound, unilateral nonorganic hearing loss. In the normal hearing ears of all individuals, CE-Chirp stimulus showed larger amplitudes at all intensity levels, except at 80 dB nHL. At the stimulus levels 80 and 60 dB nHL longer wave-V latencies were provided by Clicks than CE-Chirps, whereas at the stimulus level 40 dB nHL and belows wave-V to the CE-Chirps were longer than Clicks. ABR thresholds to CE-Chirps were closer to behavioral thresholds than Clicks. The total test time of the CE-Chirp ABR were found significantly shorter than that of the Click ABR. The use of a CE-chirp ABR testing ensure better evaluation of SSD than that of the click ABR, since the CE-Chirp ABR thresholds are very close to behavioral hearing levels in the normal hearing ears, and obtain more straight traces in the impaired ears. Wave I and wave V were observed with the Click ABR method more than CE-Chirp ABR method at high intensities. There is some drawbacks to the broad-band CE-Chirps at the stimulus level 80 dB nHL that the amplitudes became lower, while the waveform are distorted. However these deficiencies can be relieved by newly developed level specific chirp stimuli. CE-Chirp ABR can be utilized to hearing screening. We suggest that the CE-Chirp stimulus can be used as the clinical application more widely for auditory steady-state response (ASSR) besides ABR. Hence, to provide more normative parameters from a larger database can contribute to better understand the chirp stimuli in the cochlea. Key Words: CE-Chirp ABR; Click ABR; Unilateral Total Hearing Loss