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Otosclerosis
Aka: Otosclerosis
- See Also
- Hearing Loss
- Sensorineural Hearing Loss
- Conductive Hearing Loss
- Definition
- Ankylosis between Stapes footplate and surrounding bone of the inner ear
- Epidemiology
- Most often presents in middle-aged white women
- Gender predominance: Twice as common in women
- Age at onset: 30-50 years old
- Family History is present in 50% of cases
- Autosomal Dominant trait, with poor penetrance
- Pathophysiology
- Abnormal bone deposition at base of Stapes (footplate)
- Stapes fixed to oval window and unable to vibrate
- Symptoms
- Gradual onset, painless, bilateral Hearing Loss
- Tinnitus
- Signs
- Conductive Hearing Loss or mixed Hearing Loss
- Hearing Loss usually limited to 50 decibels
- See Hearing Impairment Severity Scale
- Bilateral involvement is most common
- Disproportionately effects low frequencies most commonly
- Able to hear voices in noisy environments
- Normal Tympanic Membrane appearance
- Differential Diagnosis
- See Conductive Hearing Loss
- Management
- Hearing Aid
- Sodium Fluoride
- May halt or retard progression
- Surgery: Stapedotomy or Stapedectomy
- Restore transmission with middle ear prosthesis
- Improvement in 95% of patients
- References
- Michels (2019) Am Fam Physician 100(2): 98-108 [PubMed]