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. 2020 Dec;16(3):378-381.
doi: 10.5152/iao.2020.6354.

Normative Data of Ocular Vestibular Evoked Myogenic Potentials in Response to Chirp Stimulus

Ceren Karaçaylı  1 , Fatma Ceyda Akın Öçal  2 , Volkan Kenan Çoban  2 , Bülent Satar  3
Affiliations

Normative Data of Ocular Vestibular Evoked Myogenic Potentials in Response to Chirp Stimulus

Ceren Karaçaylı et al. J Int Adv Otol. 2020 Dec.

Abstract

Objectives: This study aims at comparing the tone-burst (TB) and narrow-band (NB) CE-chirp stimuli in terms of amplitude, latency, and interaural asymmetry ratio (IAR) in ocular vestibular evoked myogenic potentials (oVEMP).

Materials and methods: In this prospective study, we enrolled 60 healthy subjects (27 men, 33 women) with a mean age of 25.83 (range, 18-48) years. Otological examination was normal in all the subjects. The subjects did not have any otological disease. All the subjects underwent oVEMP testing. We used 500 Hz TB stimulus and 500 Hz NB CE-chirp stimulus in random order. oVEMP test was performed at 100 dB normalized hearing level. P1 latency, N1 latency, and P1N1 amplitude were measured for each ear and stimulus, and IAR was calculated.

Results: Ocular VEMPs were obtained from all the subjects for both the stimuli. P1 and N1 latencies were significantly shorter in chirp stimulus than in TB stimulus for both the sides (p<0.0001). P1 and N1 amplitudes were significantly higher for chirp stimulus than for TB stimulus for both the sides (p<0.0001). There was no significant difference between the ears in IAR between the 2 types of stimuli.

Conclusion: Narrow-band CE-chirp stimulus is an effective stimulus to evoke oVEMP with higher amplitudes and shortened latencies.

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Conflict of interest statement

Conflict of Interest: The authors have no conflict of interest to declare.

Figures

Figure 1
Figure 1
Tone-burst (top) and chirp (bottom) evoked oVEMPs on right side. Note the differences in latencies and amplitudes of the waves and waveform quality of oVEMP in response to tone-bursts and chirps.
Figure 2
Figure 2
Tone-burst (top) and chirp (bottom) evoked oVEMPs on left side. Note the differences in latencies and amplitudes of the waves and waveform quality of oVEMP in response to tone-bursts and chirps.
Figure 3
Figure 3
Tone-burst and chirp stimulus wave examples with contralateral waves. C indicates contralateral waves. Note the different morphology and characteristics of the waves in response to each tone-burst and chirp stimuli, consistency of response repetitions, and also latency shift in contralateral waves.
See this image and copyright information in PMC

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