Research in Vestibular Science

Case Reports

A Case of Recurrent Vertigo in Vestibular Schwannoma Treated with Chemical Labyrinthectomy: Seung Jae Lee, Eun Sang Lee, Bo Gyung Kim, Jong Dae Lee; Res Vestib Sci. 2017;16(4):147-150. Published online December 15, 2017; DOI: https://doi.org/10.21790/rvs.2017.16.4.147

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Vestibular schwannoma (VS) can have various symptoms and almost half of the patients have balance problems. Some patients with VS can suffer from recurrent vertigo mimicking Meniere’s disease. We present the case of a 61-year-old male patient who was suffering from recurrent vertigo due to VS while symptoms improved by chemical labyrinthectomy with gentamicin. We consider that chemical labyrinthectomy can be an option in the treatment of patients with recurrent vertigo for VS.

Citations

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Diagnosis and Management of Vestibular Schwannoma: Focus on Dizziness
Sung Il Nam
Research in Vestibular Science.2021; 20(4): 119. CrossRef

A Case of Tumarkin Otolithic Crisis: Failed to Treat with Intratympanic Gentamicin Injection: Young Hyo Kim, Hoseok Choi, Kyu Sung Kim, Young Mo Kim; Res Vestib Sci. 2010;9(2):76-79.

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Abstract PDF: Tumarkin otolithic crisis is an unusual manifestation of Meniere’s disease that shows sudden falling without loss of consciousness. As a kind of life-threatening otologic emergency due to high risk of injury, the surgical ablation therapy rather than the medical one is preferred. Intratympanic injection of gentamicin (ITIG) is being introduced as a treatment by chemical ablation of vestibular function. The authors report a case of life-threatening Tumarkin otolithic crisis in 76-year-old female, after onset of Meniere’s disease, failed to treat with multiple application of ITIG, and successfully eradicated the symptom with total labyrinthectomy after then. Also we introduce her clinical feature of Tumarkin otolithic crisis. A 76-year-old female visited clinic suffering from recurrent rotatory vertigo accompanied with fluctuating hearing loss and tinnitus on her left ear, and diagnosis of Meniere’s disease was made. Four months after medical treatment, the patient experienced sudden drop attack during walking on the street without any prodromes, and her right wrist and skull base were fractured as a result. She denied to got surgery and ITIG was applied. During 1 year after initial drop attack, she experienced 7 times of severe drop attack and 4 times of ITIG, and finally she accepted to get surgery. The patient no longer suffered from drop attack after total labyrinthectomy later. Tumarkin otolithic crisis is an otologic emergency, may cause life-threatening falling. Our experience from this case is that vestibular ablation by surgical method is needed for safety and quality of life of patients.

Original Articles

Effects of Intrabullar Gentamicin Application on Guinea Pig Vestibulo-Ocular Reflex: Ja Won Koo, Jae Jun Song, Sung Kwang Hong, Ji Soo Kim; J Korean Bal Soc. 2008;7(1):9-16.

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Abstract PDF: Background and Objectives: Unilateral vestibular loss can be induced by intratympanic gentamicin instillation. Despite accumulated reports on the morphologic changes after gentamicin treatment, there are limited reports regarding the effects of gentamicin ototoxicity on the vestibulo-ocular reflex (VOR), in especially unilateral vestibular deficit by local gentamicin instillation. Aim of this study is to provide the functional changes after local gentamicin application in guinea pigs. Materials and Methods: Ten white guinea pigs (5 each for control and gentamicin treatment group) were used. Following surgical exposure of the left bulla, 0.9% saline solution or 40 mg/ml of gentamicin soaking gelfoam were applied on the round window. Horizontal vestibulo-ocular reflex (hVOR) was tested during earth vertical axis (EVA) sinusoidal harmonic acceleration rotation at 4 frequencies (0.04, 0.08, 0.16 and 0.32 Hz, 60 deg/sec of peak velocity). In one gentamicin treated animal, hVOR was tested during step velocity off-vertical axis rotation (OVAR) to clockwise and counterclockwise direction (30° forward tilt from EVA with constant velocity of 100 deg/sec). Every test was repeated before treatment and at 2 days, 5 days and 7 days after treatment. Results: The hVOR gain was significantly lowered after gentamicin treatment at all tested frequencies (p<0.05), while the gain does not change over time in control animals. Loss of bias component was evident and some decrease of modulation component was observed in counter-clockwise (lesion side) rotation after gentamicin treatment. Conclusion: This study provides characteristics of hVOR during EVA rotation and OVAR in unilateral vestibular deficit animal model by intrabullar gentamicin application.

Expression of Caveolin-1 in the Differentiated Vestibular Cell Line (UB/UE-1) after Gentamicin Toxicity: Byung Han Cho, Kyu Sung Kim, Min Wook Kim, Min Sun Kim, Byung Rim Park; J Korean Bal Soc. 2005;4(2):243-249.

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Abstract PDF: Background
and Objectives: The caveolin is known as a mediator of cell death or survival of injured cell and inhibitor of various signaling pathways. We examined expression of caveolin-1 involved by protein kinase A(PKA) signaling pathway in the differentiated mouse vestibular cell line(UB/UE-1) after gentamicin toxicity. Materials and Method: We observed caveolae in the vestibular hair cell of healthy guinea pig through electron microscope. UB/UE-1 cells were cultured at 95% CO2, 5% O2, 33℃ for 2days and at 95% CO2, 5% O2, 39℃ for 24 hours for differentiation. Cells were treated with 1 mM of gentamicin, 0.02 mM H89 (PKA inhibitor), and then incubated for 24 hours. Caveolin-1 expression was examined by western blot and PKA activity by PepTagⓇ assay.
Results
Caveolae were observed in the vestibular hair cell of healthy guinea pig by electron microscope. Caveolin-1 was expressed spontaneously in differentiated UB/UE-1 cells and increased after gentamicin treatment. PKA is overactivated by gentamicin treatment. The gentamicin induced caveolin-1 expression and PKA overactivation was inhibited by H89.
Conclusion
Our results indicate that gentamicin induced caveolin-1 expression is mediated by PKA signaling pathway. We conclude that the caveolae/caveolin through a PKA signaling pathway is the important mechanism of gentamicin induced ototoxicity.

Effect of Low Power Laser Irradiation on Gentamicin-Damaged Vestibular System in Guinea Pigs: Chung Ku Rhee, Myoung Chan Kim, Eun Seok Lim, Young Saeng Kim; J Korean Bal Soc. 2005;4(2):225-229.

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Abstract PDF: Background
and Objectives:The purpose of this study was to investigate the characteristics of gentamicin-induced vestibulotoxicity of otolith organs and preventive effect of low power laser to vestibulotoxicity by assessing the result of earth vertical and the off vertical axis rotation tests. Materials and Method: Twenty guinea pigs were grouped into two groups, laser and no laser group. Vestibulotoxicity was induced by intratympanic injection of gentamicin. Prevention of the vestibulotoxicity was studied by irradiation of low power laser. Off vertical axis rotation tilted 30 degree relative to the earth vertical axis was applied to evaluate the otolithic function.
Results
Gentamicin induced vestibulotoxicity was confirmed by gain decreasing in slow harmonic acceleration test and modulation decreasing in the off vertical axis rotation test. Prevention effect of low power laser to gentamicin induced vestibulotoxicity was confirmed by modulation maintaining in the off vertical axis rotation test and gain maintaining in the earth vertical axis rotation.

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