Mehmet Hakan KORKMAZ, Banu BAS, Kemal KESEROGLU, Serap ER, Ali ÖZDEK

Is chirp more effective than click and tone-burst during oVEMP test?

Aim: We aimed to show the effectivity of chirp stimulus and to compare with tone-burst and click stimulus during ocular VEMP(oVEMP) and also to exhibit same stimulation response pattern in utricle as seen in cochlea.Material and Methods: A total of 85 healthy volunteers without any vestibular and otologic disease history were enrolled in thisstudy. Three different types of air conduction stimuli (tone-burst, click and chirp) were used for the oVEMP test. N1, P1 latencies,N1P1 amplitudes and asymmetry ratios were investigated for each stimulus type according to age subgroups and sex.Results: The ratio of presence of oVEMP response was found to be 94.1%, 82.1% and 98.8% with tone-burst, click and chirp stimulirespectively. The latencies were significantly shorter in chirp stimulus with respect to others in both ears. The amplitudes were alsosignificantly larger in chirp stimulus with respect to other in both ears. According to analysis of N1P1 asymmetry ratios, N1 and P1latency asymmetry, there were no statistically significant difference in these values within each stimulus types.Conclusion: oVEMP is more practical, easier, faster and less invasive method. oVEMP results with chirp stimulus have shorterlatency and higher amplitude and more clear waveform morphology with higher ratio of response when compared to click and toneburst stimulus. As a result, chirp is a reliable and suitable stimulus type for oVEMP analysis. In the light of these unique results withchirp stimulus, utricular hair cells may have similar frequency specific tonotopic organization as seen in cochlea.

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