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Effect of Topical Dexamethasone for Preventing Experimentally Induced Myringosclerosis
Murat Üstündağ1, Murat Koçyiğit1, Erdoğan Bulut2
1Department of Otorhinolaryngology, Trakya University School of Medicine, Edirne, Turkey.
Objective:
We aimed to examine the effect of topical dexamethasone by otomicroscopic and histologic examinations for preventing myringosclerosis induced by myringotomy in rat tympanic membranes.
Methods:
Twenty-one Sprague Dawley rats (42 ears) were randomly divided into the following three groups after otomicroscopic examinations: experimental surgical group (5 rats), control group (8 rats), and study group (8 rats). The rats of all the groups underwent myringotomy in both tympanic membranes. Other than myringotomy, no additional procedure was performed for the rats in the experimental surgical group. In the control group, 0.9% NaCl was applied to the ears, whereas in the study groups, topical dexamethasone was applied to the ears. These applications in the control and study groups were repeated for nine days. On the 10th day of the study, the rat ears of all groups underwent otomicroscopic and histologic examinations. The prevalence and process of myringosclerosis were evaluated by otomicroscopic examination, whereas inflammation, membrane thickness, and myringosclerosis intensity were evaluated by histologic examination.
Results:
The growth of myringosclerosis with otomicroscopic examination was lesser in the study group in which topical dexamethasone was applied than the control and the experimental surgical groups. Moreover, it was observed that myringosclerosis effected fewer quadrants in the study group.Histologic examinations revealed that inflammation was significantly lesser in the study group than in the experimental surgical and control groups. The average membrane thickness values were significantly lesser in the study group than in the experimental surgical group. With respect to myringosclerosis growth, no statistically significant difference was observed among all groups, whereas with respect to myringosclerosis intensity, the rat ears in the study group were less severely affected.
Conclusion:
Thus, our study results suggest that applying topical dexamethasone after myringotomy has positive effects on limiting the intensity and prevalence of myringosclerosis.
Insights
Topical dexamethasone application after myringotomy in rats reduced the intensity and prevalence of myringosclerosis. This study highlights dexamethasone
Area of Science:
- Otolaryngology
- Surgical Pathology
- Pharmacology
Background:
- Myringosclerosis, a common sequela of myringotomy, involves calcification of the tympanic membrane.
- Preventative strategies for myringosclerosis are crucial to maintain middle ear function.
- Topical corticosteroids are investigated for their anti-inflammatory and tissue-modulating effects.
Purpose of the Study:
- To evaluate the efficacy of topical dexamethasone in preventing myringosclerosis following myringotomy in a rat model.
- To assess the impact of dexamethasone on inflammation, membrane thickness, and myringosclerosis development.
Main Methods:
- Myringotomy was performed on Sprague Dawley rats (42 ears).
- Rats were divided into three groups: experimental surgical (no treatment), control (0.9% NaCl), and study (topical dexamethasone).
- Otomicroscopic and histologic examinations were conducted on day 10 to assess myringosclerosis prevalence, intensity, inflammation, and membrane thickness.
Main Results:
- Topical dexamethasone significantly reduced myringosclerosis growth and affected fewer tympanic membrane quadrants compared to control and surgical groups.
- Histologic analysis showed significantly less inflammation and reduced membrane thickness in the dexamethasone group.
- While overall myringosclerosis growth showed no significant difference, its intensity was notably lower in the dexamethasone-treated group.
Conclusions:
- Topical dexamethasone application post-myringotomy demonstrates a positive effect in limiting the intensity and prevalence of myringosclerosis.
- Dexamethasone may serve as a valuable therapeutic agent for preventing tympanic membrane complications after surgical procedures.
- Further research is warranted to translate these findings to clinical practice.
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