-
Effects of Changes of Plateau and Rise/Fall Times on Ocular Vestibular Evoked Myogenic Potentials
-
Yeo Jin Lee, Soo Hee Han, Eun Jung Ha, Yong Soo Jung, Hi Boong Kwak, Mun Su Park, Jung Eun Shin, Hong Ju Park
-
J Korean Bal Soc. 2008;7(2):193-196.
-
-
-
 Abstract
 PDF
- Background and Objectives: The ocular vestibular evoked myogenic potential (OVEMP) is a recently discovered test of labyrinthine function, analogous to the cervical VEMP. Recent works have demonstrated the existence of OVEMPs, which likely reflect otolith-ocular reflex. The purpose of this study was to identify the optimal plateau and rise/fall times of short tone bursts to detect OVEMPs in healthy subjects.
Materials and Methods: Thirteen healthy subjects (26 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. We used a variety of plateau and rise/fall times. Three different plateau times (1, 2, and 3 ms) and rise/fall times (0.5, 1, and 2 ms) were used. The incidence, amplitudes and latencies were compared.
Results: VEMP responses were clearly observed in all 26 ears at the plateau time of 2 ms and two rise/fall times (0.5 and 1 ms). The amplitudes in the individual ears tested were lower at the rise/fall time of 2 ms than at the other conditions. The amplitudes were lower at the plateau time of 3 ms compared to the other conditions. When the rise/fall time was prolonged from 0.5 to 2 ms, the n1 and p1 latencies were prolonged in parallel. However, there was no such change in latencies according to the plateau times.
Conclusions: Our findings show that the ideal stimulation pattern for evoking OVEMP is at the rise/fall times of 0.5 or 1 ms and the plateau time of 2 ms. The waveform morphology of the VEMP responses observed with this stimulation pattern was simultaneously the most constant and marked.
Key words: Evoked potentials, Ocular VEMP, Vestibulo-ocular reflex, Otolith
-
Two Cases of Successful Treatment With Topiramate in Patients With Meniere’s Disease With Migraine
-
Hong Ju Park, Mun Su Park, Jin Seok Yoo
-
J Korean Bal Soc. 2008;7(1):96-100.
-
-
-
Abstract
PDF
- Objective: To investigate the effects of topiramate on vestibular symptoms in patients with Meniere’s disease and migraine
Case Reports: We present two patients with Meniere’s disease and migraine, who did not respond to the salt reduction diet and diuretics. Topiramate was given and maintained for several months. Frequency and severity of headache and vestibular symptoms decreased after initiation of the topiramate.
Conclusions: Topiramate can be used satisfactorily for the patients with Meniere’s disease and migraine, who are refractory to regular conservative treatment for Meniere’s disease, when vertigo attacks are accompanied by migraine.
-
Follow-up Changes of Eye Movements by Caloric Stimulation in Patients With Vestibular Neuritis
-
Mun Su Park, Ga Hyun Park, Yong Soo Jeong, Yeo Jin Lee, Jung Eun Shin, Hong Ju Park
-
J Korean Bal Soc. 2008;7(1):33-37.
-
-
-
Abstract
PDF
- Background and Objectives: A significant recovery of resting activity in the vestibular nuclei ipsilateral to the unilateral labyrinthectomy has been reported by the time symptoms such as spontaneous nystagmus and roll head tilt have largely disappeared. However, the dynamic vestibular response after unilateral vestibular loss to passively imposed vestibular stimuli does not recover.
Materials and Methods: We investigated changes of the caloric responses in 32 patients with vestibular neuritis during in- and out-patient visits separated by 2 months in an attempt to identify changes brought about by peripheral and/or central compensation processes.
Results: The slow-phase eye velocities stimulated by warm caloric stimulation at acute and follow-up stage were 6.6±6.6°/s, 9.5±9.9°/s in the lesioned side; 28.4±19.1°/s, 24.5±11.6°/s in the intact side. The slow-phase eye velocities stimulated by cold caloric stimulation at acute and follow-up stage were 5.9±7.7°/s, 10.3±8.2°/s in the lesioned side; 19.8±10.3°/s, 18.8±9.9°/s in the intact side.
Conclusion: Our findings show that the recovery of caloric responses comes mostly from the recovery of the eye responses to the caloric stimulation in the lesioned side and the eye responses to the caloric stimulation in the intact side does not change over time after vestibular neuritis.
|
KBS
