Endolymphatic hydrops
Endolymphatic hydrops is a disorder of the inner ear. It consists of an excessive build-up of the endolymph fluid, which fills the hearing and balance structures of the inner ear. Endolymph fluid, which is partly regulated by the endolymph sac, flows through the inner ear and is critical to the function of all sensory cells in the inner ear. In addition to water, endolymph fluid contains salts such as sodium, potassium, chloride and other electrolytes. If the inner ear is damaged by disease or injury, the volume and composition of the endolymph fluid can change, causing the symptoms of endolymphatic hydrops.[1]
Symptoms
The symptoms of endolymphatic hydrops include the feeling of pressure or fullness in the ears, hearing loss, tinnitus (ringing in the ears) and balance problems. Individuals who have Meniere’s disease have a degree of endolymphatic hydrops that is strong enough to trigger the symptoms of this disease, but individuals with endolymphatic hydrops do not always progress to Meniere’s disease.[1]
Causes
Endolymphatic hydrops may occur as a result of trauma such as a blow to the head, infection, degeneration of the inner ear, allergies, dehydration and loss of electrolytes or in rare circumstances a benign tumor. In many cases, it is not clear what causes the disorder. Meniere’s attacks occur when there is an increase in endolymphatic volume in the inner ear, causing a temporary leak in the membrane separating the perilymph (potassium poor fluid) and the endolymph (potassium rich fluid). The mix of these two fluids surrounding the vestibular sensory cells can lead to a temporary electrical blockade and loss of sensory function. The sudden change in the rate of the vestibular nerve firing results in a disturbance of signal processing in the corresponding brain regions und thus to acute sensations of imbalance otherwise known as vertigo.[2]
Treatment
It is necessary to know first the cause of the endolymphatic hydrops for its treatment. A low sodium diet may give dramatic vertigo relief if the underlying cause is an inability to fully process sodium. In the meanwhile, the treatment for Meniere's disease should be used.
References
- 1 2 Gürkov R, Pyykö I, Zou J, Kentala E (2016). "What is Menière's disease? A contemporary re-evaluation of endolymphatic hydrops". Journal of Neurology. 263 Suppl 1: 71–81. doi:10.1007/s00415-015-7930-1. PMC 4833790
. PMID 27083887. - ↑ Salt AN, Plontke SK (2010). "Endolymphatic hydrops: pathophysiology and experimental models". Otolaryngologic Clinics of North America. 43 (5): 971–83. doi:10.1016/j.otc.2010.05.007. PMC 2923478. PMID 20713237.