External aperture of the vestibular aqueduct in Meniere's disease.

Objective: To study the relationship of the length of the external aperture of the vestibular aqueduct and the ratio of the summating potential and action potential (SP:AP) in patients with Meniere's disease.

Study Design: Retrospective case study.

Setting: Neurotology referral center.

Summating potential and action potential ratio in Meniere's disease before and after treatment.

Objective: This study aimed to compare the summating potential and action potential ratio (SP:AP) in patients with Meniere's disease before and after various surgical and medical treatments as an indication of change in endolymphatic hydrops to study the progression of Meniere's disease.

Study Design: The study design was a retrospective case review.

Setting: The study was conducted at an otology-neurotology referral center.

Action potential latency shift by rarefaction and condensation clicks in Menière's disease.

Transtympanic electrocochleography using rarefaction and condensation clicks was performed on 122 ears of 112 patients, including 98 ears of 89 patients with Menière's disease (MD) and 24 ears of 23 patients without Menière's disease (NMD). The mean action potential (AP) latency difference between rarefaction and condensation clicks was 0.40 +/- 0.

Cochlear microphonics in Ménière's disease.

The pathophysiology of hearing deterioration in Ménière's disease (MD) is unclear. Hair cell loss has been proposed to be the cause of severe hearing loss in Ménière's disease. The cochlear microphonic (CM) is known to be the receptor potential of the outer hair cells in the cochlea.