Flashcards in ECR Table Patterns of Hearing Loss Deck (15):
1
What is the pathophsyiology of conductive loss
External or middle ear disorder impairs sound condution to inner ear
2
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)
3
usual age of onset of conductive loss
childhood and young adulthood, up to age 40
4
ear canal and drum of conductive loss
abnormality usually visible, except in otosclerosis
5
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
6
Is hearing better or worse in noisy environment with Conductive hearing loss
Better!
7
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
8
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
9
What is pathophysiology of sensorineural loss?
Inner ear disorder involves cochlear nerve and neuronal impulse transmission to brain
10
What are causes of Sensorineural loss?
Loud noise exposure, inner ear infections, trauma, tremors, congenital and familial disorders, and aging
11
Usual age of onset of sensoineural loss
Middle or later years
12
Ear canal and drum of sensorineural
problem not vidisble
13
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
14
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
15