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Updated: Aug 9, 2026
12:21
The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration
Published on: November 26, 2015
Summary
This study compared tobramycin and gentamicin ototoxicity, finding tobramycin less toxic. Significant risk factors for ototoxicity included high fever, total dose, and therapy duration over 10 days.
Area of Science:
- Pharmacology
- Ototoxicology
- Nephrology
Background:
- Aminoglycosides like tobramycin and gentamicin are crucial antibiotics.
- Ototoxicity and nephrotoxicity are known adverse effects of aminoglycosides.
- Monitoring for these toxicities is essential for patient safety.
Purpose of the Study:
- To prospectively compare the ototoxicity of tobramycin and gentamicin.
- To identify significant clinical parameters associated with aminoglycoside-induced ototoxicity.
- To determine the relationship between ototoxicity and nephrotoxicity.
Main Methods:
- Prospective monitoring of 138 patient courses of tobramycin and gentamicin.
- Weekly audiograms and electronystagmograms to assess ototoxicity.
- Twice weekly serum drug levels and kidney function tests.
Main Results:
- Tobramycin demonstrated less ototoxicity than gentamicin, with a statistically significant difference in vestibular toxicity.
- Significant risk factors for ototoxicity included fever, total dose, low hematocrit (tobramycin), high hematocrit (gentamicin), high creatinine clearance (cochlear), high creatinine (nephrotoxicity), critical illness, and therapy duration >10 days.
- Ototoxicity was independent of nephrotoxicity.
Conclusions:
- Tobramycin may be a safer alternative to gentamicin regarding ototoxicity.
- Clinical parameters such as fever, dose, and duration are critical indicators for monitoring aminoglycoside toxicity.
- Ototoxicity and nephrotoxicity appear to be distinct adverse events for these drugs.
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