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The effects of four, commercial ceruminolytic agents on the middle ear
P D Mansfield1, J E Steiss, T R Boosinger
1Department of Small Animal Surgery, College of Veterinary Medicine, Auburn University, Alabama 36849-5523, USA.
Abstract:
Four, commercially available ceruminolytic agents and physiological saline were screened for ototoxic and inflammatory reactions on the middle ear mucosae of guinea pigs (n = 38) and dogs (n = 24). Each solution was injected transtympanically in anesthetized animals. The effects were assessed by brain stem auditory evoked response (BAER) tests to evaluate hearing function and by histological examination of the middle ear structures. Varying degrees of hearing loss and inflammation were observed in some guinea pigs and dogs treated with solutions A, C, and D, whereas no abnormal finding was associated with solution B or saline.
Insights
This study evaluated four ceruminolytic agents for ear safety. Solution B and saline showed no ototoxic or inflammatory effects in animal models, unlike agents A, C, and D.
Area of Science:
- Otolaryngology
- Veterinary Medicine
- Pharmacology
Background:
- Ceruminolytic agents are commonly used to remove earwax.
- The potential ototoxic and inflammatory effects of these agents on middle ear mucosa are not fully understood.
- Evaluating the safety of ceruminolytic agents is crucial for preventing adverse reactions.
Purpose of the Study:
- To assess the ototoxic and inflammatory potential of four commercially available ceruminolytic agents and physiological saline.
- To compare the effects of these solutions on the middle ear mucosa of guinea pigs and dogs.
Main Methods:
- Four ceruminolytic agents and saline were tested on guinea pigs (n=38) and dogs (n=24).
- Solutions were administered via transtympanic injection in anesthetized animals.
- Hearing function was evaluated using brain stem auditory evoked response (BAER) tests, and histological examinations assessed middle ear structures.
Main Results:
- Ototoxic and inflammatory reactions were observed in some animals treated with solutions A, C, and D.
- Solution B and physiological saline did not cause any abnormal findings.
- Hearing loss and inflammation varied in severity among affected animals.
Conclusions:
- Ceruminolytic agents A, C, and D demonstrated ototoxic and inflammatory properties in animal models.
- Solution B and saline were found to be safe, showing no adverse effects on the middle ear mucosa.
- These findings highlight the importance of selecting safe ceruminolytic agents to avoid potential hearing damage and inflammation.