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Objectives. The aims of this study were to investigate the effect of intratympanic injection of isosorbide on the vestibular function in animal models with endolymphatic hydrops and to find a new treatment option for the acute onset of vertigo in Ménière’s disease (MD).Methods. Seventy male guinea pigs were used. Intratympanic injection of isosorbide (IT-ISB) was applied. The animals were divided into three study groups, namely the control, chronic hydrops model, and acute hydrops model groups. The intracochlear drug concentration was measured using high-performance liquid chromatography (HPLC). Vestibular function was analyzed using an animal rotator test with bidirectional sinusoidal harmonic acceleration (SHA) before and after IT-ISB. The histological change was also investigated.Results. ISB successfully permeated the perilymph through the round window membrane (RWM) at all three different concentrations of IT-ISB (25%, 50%, and 100%). In the chronic hydrops model, while IT-ISB histologically induced a reduction of endolymphatic hydrops, vestibular function was unchanged. In the acute hydrops model, no endolymphatic hydrops was histologically observed, and vestibular symmetry was also preserved after IT-ISB.Conclusion. ISB passed through the RWM into the perilymphatic space even at the lower concentrations. IT-ISB histologically reduced the hydrops in the chronic model and preserved the symmetrical vestibular function in the acute model. IT-ISB could be a treatment candidate for the acute attack of vertigo in MD.

Effects of Intratympanic Injection of Isosorbide on the Vestibular Function of Animal Models of Endolymphatic Hydrops