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Hearing loss: Difference between revisions
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(Created page with "* Conductive hearing loss ** Impaired conduction of sound through outer ear, tympanic membrane or middle ear ** Children and young adults ** Etiology *** Tympanic membrane perforation *** Otitis media with effusion *** Barotrauma *** Otosclerosis ** Diagnosis *** Pure tone audiometry **** Auditory threshold increased for air conduction **** Auditory threshold normal for bone conduction *** Speech audiometry **** Increasing loudness eventually leads to 100% speech compreh...") |
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**** Sound is louder with bone than with air conduction (negative Rinne) = conductive HL in examined ear | **** Sound is louder with bone than with air conduction (negative Rinne) = conductive HL in examined ear | ||
<noinclude>[[Category:Ear, nose, throat (ENT)]]</noinclude> | * Noise-induced hearing loss | ||
** Excessive noise causes direct mechanical and metabolic injury | |||
** Types | |||
*** Acute acoustic trauma | |||
**** < 1,5 ms sound of >140 dB | |||
**** Gunshot, airbags, fireworks | |||
*** Blast injury | |||
**** Pressure wave ruptures tympanic membrane | |||
*** Acute noise-induced hearing loss | |||
**** Seconds – hours | |||
**** Jet engine, concerts, power tools | |||
**** Often reversible | |||
*** Chronic noise-induced hearing loss | |||
**** Chronic exposure to loud sounds | |||
**** Loud music, party | |||
** Clinical features | |||
*** Muffled sensation | |||
*** Tinnitus | |||
** Diagnosis | |||
*** Hearing threshold decreased at all frequencies, especially 3 – 6 kHz | |||
<noinclude> | |||
[[Category:Ear, nose, throat (ENT)]]</noinclude> | |||