There are many methods to detect hydrops in Meniere's disease. The oldest is certainly Electrocochleography. We must also mention the glycerol test. Recently, the phase shift of DPOAEs test was developed by the Clermont-Ferrand school in France. But these tests still require functional hearing. But today the most widely used technique is MRI.

Twenty years ago we developed and published with Prof Franco-Vidal the “2 kHz conductance test”, using multifrequency admittancemetry (Franco-Vidal V, Legarlantezec C, Blanchet H, Convert C, Torti F, Darrouzet V. Multifrequency admittancemetry in Ménière's Disease: a preliminary study for a new diagnostic test. Otol Neurotol. 2005 Jul;26(4):723-7. ). We demonstrated that it highlighted intralabyrinthine overpressure, as does the phase shift test. It is therefore a barometric test of the inner ear while MRI reveals the acquired dilation of the endolymphatic sector under the effect of pressure jolts, which is a volumetric and not pressure approach. This non-invasive test is done in a few minutes and can be performed regardless of hearing level. We will describe its physical principle and its experimental validation. Due to its extreme simplicity and speed, it should become a routine test in otoneurology for recurrent vertigo. It could avoid repeated, unnecessary and costly MRI scans.