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25 Cards in this Set
- Front
- Back
Otosclerosis
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Common cause for conductive HL. Spongy growth on stapes footplate
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Myringotomy
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Surgery performed for chronic OME. Small incisions are made to the tympanic membrane to relieve pressure.
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Ranges of hearing loss
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Normal: Up to 15 dB
Mild: 16 dB to 40 dB Moderate: 41 dB to 55 dB Moderate-Severe: 56 dB to 70 dB Severe: 71 dB to 90 dB Profound: 91+ dB |
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Conductive Hearing Loss
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Efficiency of sound conduction is diminished. Inner ear, acoustic nerve and auditory centers are normal. Conductive hearing loss is NEVER profound because bone conduction still occurs.
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Hearing Level
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The lowest intensity of sound necessary to stimulate the auditory system.
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Cerebellopontine Angle
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Where the auditory nerve exits the temporal bone and enters the brainstem
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What are the 2 branches of the vestibulocochlear nerve (CN VIII)?
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Vestibular and auditory/acoustic
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What are the 2 systems of the Inner Ear?
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Vestibular and cochlear
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Which cranial nerve innervates the stapedius?
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CN VII (Facial)
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Which cranial nerve innervates the tensor tympani?
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CN V (Trigeminal)
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Type C Tympanogram result
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The point is below -100 daPa
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Type B Tympanogram result
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No point. The middle ear is filled with fluid, possibly due to cerumen impaction.
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Type Ad Tympanogram result
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Point is at 0 but the peak is abnormally high or disconnected
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Type As Tympanogram result
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Point is at 0 but it is shallow
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Type A Tympanogram
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Normal. The point is at 0 dB and the shape is a large V.
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2 ways to conduct vestibular testing
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ENG/VNG: Measure eye motion with electrodes to measure presence of dizziness
Posturography: Test of balance |
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Rollover Test
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Used to determine if there is severe cochlear distortion or retrocochlear involvement by repeating MCL at much louder levels. A decreased score means retrocochlear involvement.
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Purposes of Suprathreshold tests
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To determine how good residual hearing is
To be used as an indicator of prognosis for hearing aids Screening for retrocochlear pathologies |
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Threshold vs. Suprathreshold
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Threshold: Aims to find the lowest level of speech detected.
Suprathreshold: Determines how well a person understands what is heard once it is made audible. |
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Word Recognition Test (WRT) aka Speech Discrimination
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Familiar 1-syllable words are given at different intensity levels. Loudness level and words are given, then the percentage of words correct are calculated
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Spondee Threshold or Speech Recognition Threshold (SRT)
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Threshold of recognition of familiar, two-syllable words with equal stress on each syllable. Threshold is the lowest intensity with at least 50% accuracy. Threshold should be within 10 dB of pure tone average
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Speech Awareness Threshold (SAT)
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Threshold of detected speech. Usually 10 dB lower than ST and PTA.
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Operant Audiometry
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Conditioning voluntary responses to sound stimuli for audiometric assessments
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Electrophysiological Audiometry
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An objective measure of auditory mechanism functioning. In response to a sound, the cochlea, acoustic nerve and auditory centers generate measurable electrical impulses, called Auditory Evoked Potentials.
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Signature of noise induced HL
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On an audiogram, a drop around 4000 Hz, also known as 4k Hz Notch. Usually occurs bilaterally but not always symmetrical.
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