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[Reversible hearing loss in acute salicylate intoxication]
1HNO-Klinik der Universität Witten/Herdecke, Katholisches Krankenhaus Hagen gGmbH. a.laubert@kkh-hagen.de
HNO
|May 18, 2004
Summary
Aspirin overdose can cause temporary hearing loss and tinnitus by affecting the outer hair cell motor protein prestin. These ototoxic effects are reversible and typically resolve within days without specific treatment.
Area of Science:
- Ototoxicology
- Auditory Neuroscience
- Pharmacology
Background:
- Aspirin (acetylsalicylic acid) is a widely used medication with potential ototoxic side effects, including hearing loss and tinnitus.
- Salicylates are known to inhibit chloride anions at the anion-binding site of prestin, the motor protein in outer hair cells.
Observation:
- A case study details a young man with acute aspirin intoxication presenting with 50 dB HL asymmetric hearing loss and tinnitus.
- Otoacoustic emissions, crucial for outer hair cell function, were initially absent but measurable by day five.
Findings:
- The molecular mechanism of salicylate ototoxicity involves inhibition of prestin, explaining dose-dependency and cochlear site specificity.
- The patient's hearing loss and tinnitus resolved within five days, demonstrating the reversible nature of aspirin-induced ototoxicity.
Implications:
- Aspirin-induced hearing loss is generally reversible, often resolving within 2-3 days without specific intervention.
- Management of aspirin intoxication focuses on reducing absorption and enhancing elimination; hemodialysis is reserved for severe complications.