Abstract
Endocochlear potential (EP) and chloride concentration in endolymph were monitored with microelectrodes in the basal turn of the cochlea of the chinchilla. After intravenous injection of furosemide (25-100 mg/kg), the EP dropped precipitously and rapidly reached its minimum value, however, the chloride activity in endolymph decreased more gradually. Possible mechanisms for this phenomenon include a reduced electrostatic attraction of chloride ions to the scala media due to a decreased EP and a reduction of passive influx of chloride into endolymph, resulting from a reduction of active inward potassium transport by furosemide.
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