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Morphologic changes in round window membrane after topical hydrocortisone and dexamethasone treatment
Leif Nordang1, Birgitta Linder, Matti Anniko
1Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital, Uppsala, Sweden. leif.nordang@ent.uas.lul.se
Summary
Topical glucocorticoids like dexamethasone are safe for the round window membrane, unlike hydrocortisone, which caused inflammation. This research is crucial for inner ear disease treatments.
Area of Science:
- Otolaryngology
- Pharmacology
- Cell Biology
Background:
- Topical glucocorticoid use for inner ear diseases is growing.
- Assessing the safety of these treatments is critical before clinical application.
Purpose of the Study:
- To compare the effects of topical dexamethasone and hydrocortisone on the round window membrane's morphology.
Main Methods:
- Investigated round window membrane morphology in Sprague-Dawley rats after topical middle ear instillation of dexamethasone or hydrocortisone.
- Utilized light and transmission electron microscopy to assess membrane thickness and cellular changes.
- Compared treated membranes with control samples.
Main Results:
- Hydrocortisone instillation led to significant membrane thickening and microscopic signs of inflammation.
- Dexamethasone treatment did not result in morphological changes compared to controls.
- No significant differences were observed between dexamethasone-exposed membranes and control membranes.
Conclusions:
- Topical hydrocortisone, despite its anti-inflammatory properties, induced inflammation in the round window membrane.
- Topical dexamethasone demonstrated no adverse morphological effects on the round window membrane.
- Findings suggest differential safety profiles for glucocorticoids applied topically to the inner ear.