Hearing

Conductive Hearing Loss

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Conductive Hearing Loss

  • Epidemiology
  1. Age of onset under age 40 years
  2. Most common cause of Hearing Loss
  • 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)
  • Symptoms
  1. Minor impaired word understanding
  2. Hearing not impaired in a noisy environment
  3. Patient does not raise their voice
  • 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