In meniere’s disease, there is excessive endolymph in the inner ear causing pressure on these sensory structures, hence irritating them and causing unnecessary electrical stimuli to be sent to the brain.
These stimuli are sensed by the brain as head movement but in actual scenario, there is no movement. This perception is called as vertigo.
Hair cells in the organ of corti will also be under pressure and cannot be able to conduct impulses properly causing sensorineural hearing loss.
The endolymph produced by stria vascularis is normally drained through endolymphatic duct and sac.
Hence decompression of endolymphatic sac will help in reducing pressure inside labyrinth and improve meniere symptoms.