Reproducibility (test-retest) of vestibular evoked myogenic potential Please cite this article as: de Oliveira AC, Menezes PL, Pereira LD. Reproducibility (test-retest) of vestibular evoked myogenic potential. Braz J Otorhinolaryngol. 2015;81:264-9. ☆☆ ☆☆ Institution: Universidade Federal de Sergipe, Aracaju, Sergipe, SE, Brazil/Universidade Federal de São Paulo, São Paulo, SP, Brazil.

Aline Cabral de Oliveira Pedro de Lemos Menezes Liliane Desgualdo Pereira About the authors

INTRODUCTION:

There is still no consensus in the literature as to the best acoustic stimulus for capturing vestibular evoked myogenic potential (VEMP). Low-frequency tone bursts are generally more effective than high-frequency, but recent studies still use clicks. Reproducibility is an important analytical parameter to observe the reliability of responses.

OBJECTIVE:

To determine the reproducibility of p13 and n23 latency and amplitude of the VEMP for stimuli with different tone-burst frequencies, and to define the best test frequency.

METHODS:

Cross-sectional cohort study. VEMP was captured in 156 ears, on the sternocleidomastoid muscle, using 100 tone-burst stimuli at frequencies of 250, 500, 1000, and 2000 Hz, and sound intensity of 95 dB nHL. Responses were replicated, that is, recorded three times on each side.

RESULTS:

No significant difference was observed for p13 and n23 latencies of the VEMP, captured at three moments with tone-burst stimuli at 250, 500, and 1000 Hz. Only the frequency of 2000 Hz showed a difference between captures of this potential (p < 0.001). p13 and n23 amplitude analysis was also similar in the test-retest for all frequencies analyzed.

CONCLUSION:

p13 and n23 latencies and amplitudes of VEMP for tone-burst stimuli at frequencies of 250, 500, and 1000 Hz are reproducible.

Evoked potentials; Vestibule labyrinth; Vestibular nerve; Electromyography


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