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15 Cards in this Set
- Front
- Back
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How many spiral ganglion cells are in a normal cochlea?
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30,000 spiral ganglion cells
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Which type of patients are brain stem implants appropriate for?
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NF2 patients
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What are the two ways in which auditory information is coded into neural response?
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place coding and temporal coding
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What is temporal coding?
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temporally varying the neural response to convey the temporal properties of sund
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What is place coding?
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the specific perceptual quality of sound (pitch and timbre) that comes from the cochlear location of the neurons
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What is the minimum number of channels of pitch information needed for speech recognition?
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4
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What are two speech coding strategies?
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feature extraction: analysis of speech signal and extraction of certain key features
analog: transmission of the full speech waveform |
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What are the components of the cochlear implant? (5)
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-microphone
-external processor -external transmitter -internal receiver-stimulator -electrode array |
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True or false: etiology of deafness is usually a factor in selection of patients for implantation
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False
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What are some common criteria for selction of adult candidates for implant? (2)
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Aided HINT sentences <= 40%
Pure-tone average > 70dB Mod to profound SNHL in low frequencies 90dB or greater SNHL in middle and high frequencies |
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What are the typical criteria for selection of pediatric candidates for implant?
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1. 12 months of age for most devices
2. bilateral profound hearing loss for 12-18 months-olds; severe to profound for those older than 18 months 3. Little to no benefit from hearing aids (for youngest children, plateau in auditory development; for > age 5, minimal open-set word recognition despite appropriately fitted hearing aids and therapeutic intervention over a trial period of 3-6 months (trial period waived for postmeningitis children with radiographic evidence of ossification) 4. No medical contraindications 5. Enrollment in an educational program that emphasizes auditory development 6. Appropriate family support and expectations |
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What elements should conseling include?
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1. Case history and hearing aid history
2. Expectations - what the implant will and will not do for the patient 3. Commitment to attend all scheduled appointments during the first year 4. Attend at least one Cochlear Implant support group meeting 5. Discuss the risks and complications of surgery 6. Discuss the features of the various devices. |
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What are potential complications from cochlear implant surgery? (7)
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1. facial weakness/paralysis
2. wound infection 3. CSF drainage 4. meningitis 5. anesthesia 6. extrusion or device failure 7. loss of residual hearing |
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When should the initial fitting of the cochlear implant occur?
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~1 month after surgery
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Which patients do better?
Patients whose hearing loss was prelingual or postlingual? Patients who were deaf a short period of time or a long time? |
Postlingual
Deaf for a short period of time |
