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Abstract:
Topically induced ototoxicity caused by applying substances into the middle ear is discussed in detail. The numerous ototoxic cases described in the recent literature and the high aminoglycoside antibiotic concentrations contained in ear drops are stressed. Methods for reducing the aminoglycoside antibiotic ototoxicity of these ear drops are given. These include safe and effective concentrations of 30 or 60 mg/l Gentamicin, Sisomicin or Tobramycin and their application by ointment. Different chapters deal with the ototoxicity of other antibiotics and solutions, particularly with the risk in sterilization of the middle ear space by surface disinfectants such as chlorhexidine or benzalkonium-chloride. The rare indications for topical ear drops in otitis media are described.
Insights
Topical ear drops can cause ototoxicity, especially with high aminoglycoside antibiotic concentrations. Using lower concentrations (30-60 mg/l) in ointments can reduce this risk.
Area of Science:
- Ototoxicology
- Pharmacology
- Otolaryngology
Context:
- Topical application of substances to the middle ear can lead to ototoxicity.
- Recent literature highlights numerous ototoxic cases linked to ear drops.
- High concentrations of aminoglycoside antibiotics in ear drops are a significant concern.
Purpose:
- To detail topically induced ototoxicity from middle ear applications.
- To identify methods for reducing ototoxicity from aminoglycoside ear drops.
- To assess risks associated with disinfectants used in middle ear sterilization.
Summary:
- Discusses topically induced ototoxicity from middle ear applications, emphasizing risks from aminoglycoside ear drops.
- Proposes safe and effective concentrations (30 or 60 mg/l) of Gentamicin, Sisomicin, or Tobramycin, recommending ointment application.
- Examines ototoxicity of other antibiotics and disinfectants (chlorhexidine, benzalkonium-chloride) and rare indications for topical ear drops in otitis media.
Impact:
- Provides guidelines for safer topical ear drop formulations to prevent hearing loss.
- Highlights the ototoxic potential of common middle ear disinfectants.
- Informs clinical practice regarding the judicious use of topical treatments for otitis media.