[Acute sensory deafness originating from experimental double-membrane rupture]

Area of Science:

• Otolaryngology
• Neuroscience
• Auditory Physiology

Context:

• Sudden deafness is a complex condition with various potential causes.
• Understanding the mechanisms of cochlear damage is crucial for developing effective treatments.
• Previous research has focused on single membrane ruptures, but combined ruptures are less understood.

Purpose:

• To investigate the effects of combined Reissner's membrane and round window membrane rupture on cochlear function in guinea pigs.
• To determine if double-membrane rupture causes acute profound sensorineural hearing loss.
• To assess the impact of the location of Reissner's membrane rupture on auditory function.

Summary:

• Guinea pigs with combined Reissner's membrane and round window membrane rupture exhibited greater decreases in auditory nerve action potential (AP) amplitude across all tested frequencies compared to controls with only round window rupture.
• Ruptures involving the second turn of Reissner's membrane resulted in more significant AP amplitude reductions than those at the third or apical turns.
• Histological analysis confirmed Reissner's membrane ruptures.

Impact:

• Double-membrane rupture is identified as a potential cause of sudden deafness.
• The severity of cochlear dysfunction is influenced by the specific location of Reissner's membrane rupture.
• This study provides insights into the pathophysiology of sudden hearing loss and informs future research directions.