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Histopathologic changes in snoring and obstructive sleep apnea syndrome
B T Woodson1, J C Garancis, R J Toohill
1Department of Otolaryngology and Human Communication, Medical College of Wisconsin, Milwaukee 53226.
The Laryngoscope
|December 1, 1991
Summary
Histopathology in obstructive sleep apnea (OSA) and severe snoring shows similar pharyngeal tissue changes. Degenerative nerve changes in OSA may impair reflexes, contributing to airway instability.
Area of Science:
- Sleep Medicine
- Otolaryngology
- Pathology
Background:
- Obstructive sleep apnea (OSA) pathophysiology involves airway instability, but the underlying causes are unclear.
- Potential factors include altered neurologic control, airway morphology, or both.
Purpose of the Study:
- To investigate histopathologic differences in pharyngeal tissues between severe OSA patients, severe snorers, and non-snorers.
- To identify tissue features contributing to airway instability and OSA development.
Main Methods:
- Qualitative comparison of pharyngeal tissue sections (soft palate, uvula) using light and electron microscopy.
- Analysis of samples from 4 severe apneics, 4 severe snorers, and 4 non-snorers.
Main Results:
- Light microscopy revealed mucous gland hypertrophy, squamous metaplasia, muscle disruption, muscle atrophy, and edema in both apneics and snorers.
- No distinct histopathologic features were uniquely associated with apnea development.
- Electron microscopy in severe apneics showed focal degeneration of myelinated nerve fibers and axons.
Conclusions:
- Similarities in pharyngeal tissue changes between OSA and severe snorers suggest a common etiology, possibly related to vibratory trauma.
- Nerve degeneration in OSA may impair pharyngeal reflexes, contributing to airway instability and apnea.