Meniere's disease (MD) is characterized by episodic vertigo, low-frequency fluctuating sensorineural hearing loss, aural fullness and tinnitus. Temporal bone studies in 1938 revealed that the otopathology of Meniere's disease is endolymphatic hydrops [1]. Although it has been known for a century that MD is caused by endolymphatic hydrops, the etiology of hydrops is still unknown. Theories such as rupture theory, pressure theory and drainage theory have been put forward and there are many treatment modalities that aim to control the symptoms caused by MD [2]. The aim of the treatment is to reduce the severity and frequency of vertigo, reduce hearing loss and tinnitus and fullness, and increase the quality of life. However, for the effectiveness of the treatment, it is necessary to rule out other diseases such as otosyphilis, acute labyrinthitis, vestibular neurinitis and vestibullar migraine, which are symptomatically similar to MD and whose treatments are very different [2]. As a matter of fact, it can take a long time to diagnose and start treatment. Medical treatments include the use of dietary restriction, diuretics, vasoactive agents, corticosteroids and others. Patients who are refractory to medical treatment are candidates for invasive procedures, among which are intratympanic gentamicin and corticosteroid injections, Meniett device, selective vestibular neurectomy, labyrinthectomy, and endolymphatic sac surgery (ESS) [3,4]. The patient's usable hearing status is very decisive in determining treatment [2]. Endolymphatic sac decompression (ESD), which is a non-destructive surgical method, was first described by Portman in 1923 [5]. ESD drains the excessive endolymph and decompresses membranous labyrinthine pressure. It has been reported that ESD accomplishes complete vertigo control in 42–88 % of patients [[6], [7], [8], [9], [10], [11], [12]]. It is thought that success in vertigo control decreases in the following years after the procedure. In terms of hearing preservation, ESD is thought to provide better results than other surgical procedures, and the total incidence of SNHL is <2 % [3,4,13]. Endolymphatic sac surgery has a low risk of complications, and rare complications include CSF leak, facial paralysis, vertigo, and wound infection. Although there is no consensus on the long-term efficacy of ESD, it can be preferred in bilateral disease and unilateral disease with serviceable hearing.

This study aimed to evaluate the following outcomes of ESD: caloric response changes, hearing results, and functional level scores.