ECR Table Patterns of Hearing Loss Flashcards Preview

ECR 2012 > ECR Table Patterns of Hearing Loss > Flashcards

Flashcards in ECR Table Patterns of Hearing Loss Deck (15):

What is the pathophsyiology of conductive loss

External or middle ear disorder impairs sound condution to inner ear


what are causes of Conductive hearing loss?

1. foreign body
2, otitis media (inflammation of middle ear)
3. perforated eardrum
4. otosclerosis of ossicles (abnormal growth of bone near middle ear)


usual age of onset of conductive loss

childhood and young adulthood, up to age 40


ear canal and drum of conductive loss

abnormality usually visible, except in otosclerosis


Effects of Conductive Loss

Little Effect on sound

Hearing seems to improve in noisy environment

Voice becomes soft b/c inner ear and cochlear nerve are intact


Is hearing better or worse in noisy environment with Conductive hearing loss



What is Weber TEst in Conductive hearing loss (in unilateral hearin loss)

Tuning fork at vertexlo

louder in IMPAIRED Ear

Sound lateralizes to IMPAIRED EAR- room noise not well heard, so detection of vibration IMPROVES


What are results of RINNE test in Conductive hearing

Tuning fork at external auditory meatus then on mastoid boine

Bone conduction longer than or equal to air conduction (BC>AC)

Louder in BONE!

while air conduciton through external or middle ear is impaired, vibrations through bone bypass problem to reach cochlea


What is pathophysiology of sensorineural loss?

Inner ear disorder involves cochlear nerve and neuronal impulse transmission to brain


What are causes of Sensorineural loss?

Loud noise exposure, inner ear infections, trauma, tremors, congenital and familial disorders, and aging


Usual age of onset of sensoineural loss

Middle or later years


Ear canal and drum of sensorineural

problem not vidisble


Effects of sensorineural loss

Higher regsiters are lost, so sound may be distorted

hearing worsens in noisy environment

Voice may be loud b/c hearing is difficult


How can you tell it is Sensorineural loss in Weber teest?

Sound lateralizes to GOOD EAR - inner ear or cochlear nerve damage impairs transmission to affected ear


What are results of Rinne test with sensorieural test


Air conduction longer than bone conduciton A


inner ear or cochlear nerve is less able to transmit impulses regarless of how the vibration reach cochlea.