Cochlear Battery flashcards |

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Reflexes: Premise

That it will take a while before they can hear it, but they will hear it b/c they will have recruitment

Reflexes: Recruitment

Caused by the loss of OHC

Reflexes: Sensation Levels

-Do we have that smaller dynamic range

-They may have a reduced dynamic range b/w where they can finally hear and where it becomes painfully loud

Short Increment Sensitivity Index (SISI): Premise

Determines if the patients is able to notice a 1 dB increment change (JND)

Short Increment Sensitivity Index (SISI): Methods

1. Plays and ongoing sound at a specific loudness, start at about 10 dB above

2. Increases by 1 dB 20 times, if they raise their hand saying they heard the difference they heard the difference

Short Increment Sensitivity Index (SISI): Interpretation

-Most people with normal hearing will not be able to hear a 1 dB difference, can tell about 7 times, but not all 20

-If they have recruitment, they will be able to respond to more than 7 and they have a cochlear/sensory loss b/c they have a small distance b/w being able to hear it and it being too loud

Loudness Growth: Premise

Look for the length of the dynamic range

Loudness Growth: Performance

-Tell me when you barely hear it, clearly hear it, it's loud, it's almost uncomfortable, it's painfully loud

-May not do all the middle ones, unless we are doing a hearing aid

Loudness Growth: Interpretation

Normal hearing: Barely hear it = 0 dB & Painful = 100-110 dB

-W/ Recruitment - Must go from barely hearing it to painfully loud within a very small dynamic range (40 dB range)

Loudness Growth: Tonal and/or Speech

-UCL: speech

-LDL: tone

-60 dB or below, dynamic range is small between quiet and loudest sound.

Alternative Binaural Loudness Balance Test (ABLB): Premise

Use if they have one normal ear and one bad ear, to look for recruitment

Alternative Binaural Loudness Balance Test (ABLB): Methods

1. Compare to ear that has a hearing loss

2. Complete recruitment = when the bad ears hears the same as the good ear - It has to get smaller and smaller units to match the loudness perception

Alternative Binaural Loudness Balance Test (ABLB): Interpretation


OAEs: Premise

-Looks at the OHC movement

-We can measure the outer hair cell function (assuming they have a normal tympanogram)

OAEs: Transient

Put click that stimulate the cochlea at the whole time and measures what comes out

OAEs: Distortion Products

- Put 2 sounds in and you measure if a third sound comes out

-Typically screen with DP, to look at specific frequencies

OAEs: Interpretation

-If they sound goes in and the OAEs come back out = IHCs are damaged

-If the sound goes in and NO OAEs come back = OHCs are damaged - Suggesting Cochlear/Sensory loss and they have recruitment

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