endolymphatic hydrops/potassium

OBJECTIVE Vertigo, the cause of disability in many patients with Ménière's disease, may be the result of the effects of endolymphatic hydrops on the semicircular canals. We hypothesize that intractable vertigo may be controlled by destruction of the semicircular canal neuroepithelium using visible

Low-frequency sounds presented at high nontraumatizing levels induce temporary hyperacusis in humans and animals. One explanation of this finding is that the basilar membrane operating point may be disturbed by an endolymph volume change. This possibility was investigated using volume and flow

The protein content and the d.c. potential of the endolymph differs in the various parts of the endolymphatic space (cochlea, utricle, semicircular canals and endolymphatic sac) as also does the ion composition (chloride, potassium, sodium). 12 months after obliteration of the endolymphatic sac and

The electrochemical changes of the inner ear fluids were studied in the guinea pig during the development of endolymphatic hydrops in an experimental model of Meniere's disease obtained by the blockage of the vestibular aqueduct. The endocochlear potential (first and third turns) was recorded, and

Serum, cerebrospinal fluid (CSF), scala vestibuli perilymph, and scala tympani perilymph were collected from 85 normal guinea pigs both before and after i.v. administration of glycerol (1 ml/kg), and the sodium and potassium concentrations were assessed using a microflame photometer. Marked

OBJECTIVE To investigate the relationship between endolymphatic hydrops and perilymphatic potassium. METHODS 20 pigmented guinea pigs were used: 10 for scala vestibuli study and 10 for scala tympani study. Acute endolymphatic hydrops was produced by microinjection of an artificial endolymph into the

Endolymphatic hydrops of the nonprogressive type occurs in response to a single traumatic or toxic insult of limited duration and although it may result in permanent deficits in sensorineural function, there is total subsidence of vestibular symptoms. Endolymphatic hydrops of the progressive type,

The examples of sudden deafness and Meniere's Disease are used to discuss the possibilities of causal therapy for inner ear dysfunctions. In sudden deafness, etiological and therapeutic considerations are focused on the problem of disorders of the arterial and venous microcirculation, contributing

The most prominent changes in temporal bone histopathology of Menière's disease are hydrops-like extensions of the endolymphatic spaces. The endolymphatic hydrops seems to be the consequence of a diminished function or complete atrophy of the endolymphatic sac. The etiology or pathomechanism of

Although many studies have suggested a relation between allergy and Ménière's disease, the pathophysiology of this condition remains controversial. The aim of this study was to clarify whether an anaphylactic reaction in the inner ear can disturb hearing and equilibrium, and whether such

OBJECTIVE To study the effect of vasopressin on aquaporin 7 (AQP7) expression in rat inner ear and reveal the possible role of aquaporins in the formation of endolymphatic hydrops induced by vasopressin. METHODS Wistar rats were intraperitoneally injected with 50 microg/kg arginine vasopressin once

Pendred syndrome is a recessive autosomal disorder characterized by thyroid goiter and sensorineural hearing loss. The Pendred syndrome gene (SLC26A4) encodes a new anion exchanger named pendrin which mediates iodide transport by thyrocytes and regulates ion and fluid transport by the endolymphatic

Metabolic disturbances may affect inner ear fluid homeostasis in various ways. The membrane sodium-potassium pump must play a role in this homeostasis, and as this pump derives energy from A.T.P. it may also depend somewhat on the presence of prostaglandins, through their stimulatory effect on the

Inner ear fluids were studied biochemically in guinea pigs from 1 to 16 weeks after producing endolymphatic hydrops by obstructing the endolymphatic duct. Fluid collected from beneath the footplate showed changes of 50% of the animals indicating distension of the saccule. There was an increase in

In addition to an endolymphatic hydrops in various models of Ménière's disease, ruptures of the membranes lining the endolymphatic spaces or massive changes in their biochemical permeability are believed to allow large amounts of potassium-rich endolymph to deluge the normally low [K+] perilymphatic