Endolymphatic hydrops precipitated by haemodialysis. We report a case of endolymphatic hydrops preceded by haemodialysis in the contralateral ear of a patient with known Meniere's disease, and discuss the possible mechanism. It is suggested that the sudden decrease of plasma osmolality during haemodialysis acts as a reverse glycerol test. The audiometric and electrophysiological recordings pre- and post-dialysis and the induction of the Meniere's triad of symptoms during dialysis, were strongly indicative of the presence of endolymphatic hydrops. 