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Ossicular chain reconstruction improves bone conduction threshold in chronic otitis media
1Department of Otorhinolaryngology-Head and Neck Surgery, Pundang Jesaeng Hospital, Daejin Medical Center, Sungnam, Korea.
The Journal of Laryngology and Otology
|July 12, 2007
Summary
Chronic otitis media significantly elevates bone conduction thresholds, particularly at 2000 Hz. Ossicular reconstruction improves these thresholds, suggesting middle ear conductive changes are the primary cause.
Area of Science:
- Otolaryngology
- Audiology
- Neurosurgery
Background:
- Chronic otitis media (COM) can affect hearing by altering sound conduction.
- Bone conduction thresholds (BCTs) may be elevated in COM, but the underlying mechanisms require further investigation.
Purpose of the Study:
- To assess BCT elevation in COM patients.
- To investigate the mechanisms behind BCT elevation in COM.
- To evaluate the impact of surgical intervention on BCTs.
Main Methods:
- Retrospective review of 106 patients with unilateral COM post-tympanomastoidectomy.
- Comparison of BCTs between diseased and healthy ears.
- Assessment of BCT changes based on disease duration, cholesteatoma presence, and post-operative ossicular reconstruction.
Main Results:
- Mean BCTs were significantly elevated (3.4–11.6 dB) on the diseased side, peaking at 2000 Hz.
- Disease duration and cholesteatoma presence did not correlate with BCT elevation.
- Ossicular reconstruction led to significant BCT improvement across all frequencies, most notably at 2000 Hz.
Conclusions:
- Elevated BCTs in COM are primarily attributed to conductive mechanism changes within the middle ear.
- Surgical intervention, specifically ossicular reconstruction, can effectively restore hearing by addressing these conductive issues.
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01:13The Cochlea
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.