Air-Bone Gap in Menière's Disease after Exposure to Overpressure

Abstract

Equal loss in sensitivity for air and bone conduction and poor speech discrimination are considered characteristic of the hearing impairment in Menière's disease. Periodic pressure changes applied to the middle ear produced an air-bone gap in 16 out of 19 patients with advanced Menière's disease. The air-bone gap was associated with an improvement in speech discrimination scores. Subsequently, the air-conduction hearing loss decreased. The shapes of psychoacoustic tuning curves of patients with the air-bone gaps showed an improvement in frequency resolution. The curves remained elevated in threshold, however, which indicates an attenuation of the sound stimuli. The relative change in bone conduction sensitivity was interpreted as an early sign of improvement in the inner ear mechanics, caused by exposure to pressure changes.

Key Words:

• Menière's disease
• Air-bone gap