Otolaryngology Book

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Conductive Hearing Loss

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  1. See Also
    1. Hearing Loss
    2. Sensorineural Hearing Loss
  2. Epidemiology
    1. Age of onset under age 40 years
    2. Most common cause of Hearing Loss
  3. Causes
    1. Middle ear effusion
      1. Otitis Media (20-30 db Hearing Loss)
      2. Eustachian Tube Dysfunction
    2. Cerumen Impaction (complete ear canal occlusion)
    3. Ear Canal Foreign Body
    4. Bony growths of ear canal (exostosis or Osteoma)
    5. Otitis Externa
    6. Cholesteatoma
    7. Otosclerosis
    8. Mastoiditis
    9. Severe Myringosclerosis (Tympanosclerosis)
    10. Glomus tumor
    11. Tympanic Membrane Perforation
      1. Head Trauma
      2. Barotrauma (Rapid descent in air or water, straining)
  4. Symptoms
    1. Minor impaired word understanding
    2. Hearing not impaired in a noisy environment
    3. Patient does not raise their voice
  5. Signs
    1. Otoscopy
      1. Abnormal Ear Canal or TM
    2. Weber Test (Tuning Fork at Midline) Abnormal
      1. Sound radiates to the ear with conductive loss
      2. Conductive loss shuts out noisy environment
    3. Rinne Test (Tuning fork on Mastoid) Abnormal
      1. Bone Conduction is better than Air Conduction

Conductive hearing loss (C0018777)

Definition (MSH)Hearing loss due to interference with the mechanical reception or amplification of sound to the COCHLEA. The interference is in the outer or middle ear involving the EAR CANAL; TYMPANIC MEMBRANE; or EAR OSSICLES.
Definition (CSP)involves lesions of the external and middle ear resulting in malconduction of airborne sound.
ConceptsDisease or Syndrome (T047)
ICD9389.0, 389.00
EnglishCD - Conductive deafness, CHL - Conductive hearing loss, Conductive deafness, Conductive hearing loss, Unspecified conductive hearing loss
Spanishperdida auditiva de conduccion, perdida de audicion de conduccion no especificada, sordera conductiva
Parent ConceptsHearing problem (C0260662), Conductive hearing loss (C0018777), hearing impairment (C1384666), Deafness (C0011053), Hearing Loss, Partial (C0018772), Ear Diseases (C0013447), Duplicate concept (C1274013)
SourcesAOD, COSTAR, CSP, DXP, ICD9CM, MSH, MTH, MTHICD9, NCI, NDFRT, OMIM, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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