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Conductive Hearing Loss
Aka: Conductive Hearing Loss
- See Also
- Hearing Loss
- Sensorineural Hearing Loss
- Hearing Impairment Severity Scale
- Epidemiology
- Age of onset under age 40 years
- Most common cause of Hearing Loss
- Causes
- Infection (and sequelae)
- Middle ear effusion
- Otitis Media with Effusion (20-30 db Hearing Loss)
- Eustachian Tube Dysfunction
- Otitis Externa
- Mastoiditis
- Obstruction
- Cerumen Impaction (complete ear canal Occlusion)
- Ear Canal Foreign Body
- External canal oxostoses (Surfer's Ear)
- Sclerosis
- Otosclerosis
- Severe Myringosclerosis (Tympanosclerosis)
- Neoplasms and Masses
- Cholesteatoma
- Glomus tumor
- Bony growths of ear canal (exostosis or osteoma)
- Trauma
- Ossicular Chain Disruption
- Tympanic Membrane Perforation
- Head Trauma
- Barotrauma (Rapid descent in air or water, straining)
- Symptoms
- Minor impaired word understanding
- See Hearing Impairment Severity Scale
- Hearing not impaired in a noisy environment
- Patient does not raise their voice
- Signs
- Otoscopy
- Abnormal Ear Canal or Tympanic Membrane
- Weber Test (Tuning Fork at Midline) Abnormal
- Sound radiates to the ear with conductive loss
- Conductive loss shuts out noisy environment
- Rinne Test (Tuning fork on Mastoid) Abnormal
- Bone Conduction is better than Air Conduction
- Diagnostics
- Tympanogram
- Audiogram
- Management
- Treat Suppurative Otitis Media if present
- See Eustachian Tube Dysfunction
- Otolaryngology for suspected structural disorders
- References
- Cunningham (2017) N Engl J Med 377(25): 2465-73 [PubMed]
- Edmiston (2013) BMJ 346: f2495 +PMID:23618723 [PubMed]
- Uy (2013) Ann Intern Med 158(7): ITC4-1 +PMID:23546583 [PubMed]
- Michels (2019) Am Fam Physician 100(2): 98-108 [PubMed]