[Experimental endolymphatic hydrops and its related morphological and functional changes in guinea pigs]

Area of Science:

• Otolaryngology
• Neuroscience
• Vestibular System Research

Context:

• Endolymphatic hydrops is a condition affecting the inner ear.
• Understanding hydrops' impact on auditory and vestibular function is crucial.
• Guinea pigs serve as a model for studying inner ear disorders.

Purpose:

• To investigate morphological and functional changes in guinea pigs with induced endolymphatic hydrops.
• To evaluate alterations in semicircular canal function using electrophysiological and histological methods.
• To propose novel ENG criteria for assessing vestibular function in hydrops.

Summary:

• Successful induction of endolymphatic hydrops in guinea pigs.
• Observed hydrops primarily in cochlear and saccular structures, with late degeneration in auditory components.
• Documented hearing loss (low frequencies initially) and vestibular deficits (paralysis, directional preponderance).
• No significant correlation found between hearing loss severity and semicircular canal dysfunction.
• Introduced new ENG criteria for evaluating semicircular canal function via angular acceleration stimuli.

Impact:

• Provides insights into the pathophysiology of endolymphatic hydrops.
• Establishes a foundation for diagnosing and managing hydrops-related hearing and balance disorders.
• Offers a novel, quantitative method for assessing vestibular function in research and clinical settings.