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Changes in endolymph chloride concentration following furosemide injection
Hearing Research
|January 1, 1986
Summary
Furosemide rapidly reduces the cochlear endocochlear potential (EP), but chloride concentration in endolymph decreases more slowly. This suggests furosemide impacts both EP and chloride transport mechanisms in the inner ear.
Area of Science:
- Otoacoustic emissions
- Inner ear physiology
- Auditory neuroscience
Background:
- The endocochlear potential (EP) is crucial for hearing.
- Chloride ions play a significant role in cochlear function.
- Furosemide is a diuretic with known effects on ion transport.
Purpose of the Study:
- To investigate the acute effects of furosemide on EP and endolymphatic chloride concentration.
- To elucidate the mechanisms underlying furosemide-induced changes in cochlear ion homeostasis.
Main Methods:
- Microelectrode recordings were used to measure EP and chloride concentration in the chinchilla cochlea.
- Intravenous furosemide was administered at doses of 25-100 mg/kg.
Main Results:
- Furosemide caused a rapid and significant drop in EP.
- Chloride concentration in the endolymph decreased more gradually than the EP.
- The findings suggest a dual effect of furosemide on cochlear electrophysiology.
Conclusions:
- Furosemide's rapid EP reduction may be linked to decreased electrostatic attraction of chloride.
- Slower chloride decline suggests furosemide also impairs passive chloride influx.
- Reduced active potassium transport by furosemide might contribute to these observed changes.