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Myringosclerosis caused by increased oxygen concentration in traumatized tympanic membranes. Experimental study
C Mattsson1, K Magnuson, S Hellström
1Department of Otorhinolaryngology, University of Umeå, Sweden.
The Annals of Otology, Rhinology, and Laryngology
|August 1, 1995
Summary
High oxygen levels in the middle ear cavity increase the risk of myringosclerosis, a condition causing eardrum thickening. Low oxygen levels, conversely, reduce the development of these lesions.
Area of Science:
- Otolaryngology
- Physiology
- Pathology
Background:
- Myringosclerosis is a common condition affecting the tympanic membrane.
- The role of oxygen concentration in the middle ear cavity on myringosclerosis development is not fully understood.
Purpose of the Study:
- To investigate the relationship between middle ear oxygen concentration and the development of myringosclerosis.
- To determine if hyperoxia or hypoxia influences the formation of myringosclerotic lesions.
Main Methods:
- Rats with myringotomized tympanic membranes were exposed to varying oxygen concentrations (10%, 15%, 40%) or ambient air.
- Additional groups had intubated tympanic membranes exposed to 10% or 40% oxygen.
- Otomicroscopic examination was used to assess myringosclerotic lesions and epithelial hyperplasia.
Main Results:
- Animals exposed to higher oxygen concentrations (hyperoxia) showed significantly more myringosclerotic lesions.
- Hyperoxic groups also exhibited pronounced hyperplasia of the keratinizing epithelium around the perforation.
- Hypoxic animals displayed fewer or absent myringosclerotic lesions.
Conclusions:
- Increased oxygen concentration in the middle ear cavity is associated with a higher likelihood of myringosclerotic deposits.
- The findings suggest a potential role for oxygen radicals in the mechanism of myringosclerosis.
- Oxygen levels in the middle ear cavity may be a modifiable factor in myringosclerosis development.