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ENT > Hearing > Flashcards

Hearing Flashcards

1
Q

What is the purpose of the organ of corti?

A

Basilar membrane is tuned to diff freq
Afferent:
Efferent signal to fine tune and amplify

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2
Q

How is a sound amplified?

A

Shape of auricle
Resonance of ear canal
Ratio of SA of TM to foot plate of stapes
Lever action of ossicular chain

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3
Q

What is the Cochlear Microphonic?

A

Efferent pathway creates a neurologic echo that can be measured

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4
Q

What is the auditory brainstem response?

A

Afferent signal to brain measured externally

Compound action potentials at diff locations in midbrain

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5
Q

What is tested in Hearing booth adult behavioral testing?

A

Hearing level
Speech reception threshold
Speech Discrimination or word recognition

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6
Q

What is an Audiogram?

A

Graphic Rep of hearing

Normogram for frequency

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7
Q

What is the use of Otoacoustic Emissions?

A

Can tell yout that the cochlear function is intact

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8
Q

What are the limitations of OAE?

A
  • Very high false pos rate
  • Emissions will be absorbed, not present
  • Repeated til positive
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9
Q

What are the limitations of ABR?

A

Sedation soon after infancy

Only audiogram can assess the sensory experience of hearing

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10
Q

What is Tympanometry?

A

Measure of compliance of Tympanic membrane at varying pressures below/at/ above atmospheric pressure.

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11
Q

What is the difference between Types of Tymponograms?

A

…###@@@

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12
Q

What is Conductive Vs Sensorineural vs Mixed Hearing loss?

A

Cond: Abn of Amplification signal
SN: Abn of Cochlear funct or conductive Pathways through Brainstem

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13
Q

What is the most common cause of Peds Conductive hearing loss?

A

Middle Ear Effusion

less common: auricular atresia

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14
Q

What is the most common cause of Adult Conductive hearing loss?

A

Longstanding Chronic Ear disease

Less common: Otosclerosis

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15
Q

What is the most common cause of Peds SN hearing loss?

A

Congenital

Less common: Hereditary late onset

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16
Q

What is the most common cause of Adult SN hearing loss?

A

Presbycusis (Aging)

Less common: Acoustic Neuroma

17
Q

What is the BAHA Device?

A 
Osteointegrated temporal bone impalant
TC or subdermal magnet
Direct stim of cochlea
BL Cond HL stim ips cochlea
UL SNHL stim cont cochlea

ENT (12 decks)

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