Effects of Gaze Positions on Ocular Vestibular Evoked Myogenic Potentials.
10.3342/kjorl-hns.2009.52.3.215
- Author:
Yeo Jin LEE
1
;
Soo Hee HAN
;
Eun Jung HA
;
Jae Yoon AHN
;
Ga Hyun PARK
;
Yong Soo JUNG
;
Hi Boong KWAK
;
Mun Su PARK
;
Jung Eun SHIN
;
Hong Ju PARK
Author Information
1. Department of Otorhinolaryngology-Head and Neck Surgery, Konkuk University School of Medicine, Seoul, Korea. hpark@kuh.ac.kr
- Publication Type:Original Article
- Keywords:
Evoked potentials;
OVEMP;
Vestibulo-ocular reflex;
Saccule
- MeSH:
Electrodes;
Evoked Potentials;
Eye;
Incidence;
Reflex;
Reflex, Vestibulo-Ocular;
Saccule and Utricle;
Vestibular Evoked Myogenic Potentials
- From:Korean Journal of Otolaryngology - Head and Neck Surgery
2009;52(3):215-219
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND AND OBJECTIVES: Recent works have demonstrated the existence of ocular vestibular evoked myogenic potentials (OVEMPs), which reflects otolith-ocular reflex. The purpose of this study was to identify an appropriate gaze position to detect OVEMPs produced by air-conducted sound stimulation in healthy subjects. SUBJECTS AND METHOD: Twenty four healthy subjects (35 ears) were included in this study. Surface electromyographic activity was recorded from active electrodes placed inferior to each eye. Stimulation with 500 Hz short tone bursts was used to activate the vestibular end-organs. RESULTS: Sound stimulation evoked negative-positive biphasic responses on both ipsilateral and contralateral eyes, while responses were contralateral eye-dominant. Contralateral eye responses had higher response incidence and larger amplitudes. Altering the direction of gaze generally changed the incidence and size of the inter-peak amplitudes. The higher incidence and larger amplitudes were recorded when the eyes are directed to the superior and ipsilateral side to the sound stimulation. In that gaze position, the amplitude was 5.3 micronV, the first negative peak latency was 10.5 ms and the following positive peak latency was 15.4 ms on the average. CONCLUSION: OVEMPs can be evoked using an air-conducted 500 Hz tone burst and are best recorded contralaterally with a upward gaze towards the source of sound stimulation. Further changes of the test parameters are needed for higher and consistent responses.
