Guinea pigs deafened by aminoglycoside are a model of neuronal degeneration secondary to hair cell destruction in the organ of Corti.

In this model, the left ear is operated on and the right ear is used as control (untreated ear, no operations). Each left bulla is opened under sterile conditions through a retro-auricular approach. The cochlea is exposed ventrally and opened using a 26 gauge needle. A catheter is inserted and connected to an electrical Hamilton syringe pump. The aminoglycoside gentamicin is administered at a concentration of 50 mg/ml for the cochlear lesion (25 ml of gentamicin in 5 min). Using the same cochlear opening, a catheter inserted and connected to a subcutaneous osmotic pump filled with products to be tested and dissolved in artificial perilymph solution.

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