36.2 Hearing Loss and Deafness Flashcards
normal hearing loss dB?
up to 20dB
normal conversation ranges between?
50-75 dB
types of hearing tests?
physiologic (any age)
- tympanometry
- otoacoustic emissions
- auditory brainstem response
- electrocochloeography (under GA)
what kind of hearing test for 6-9 month olds?
behavioural testing
tympanograms type A,B,C?
A - normal peak
B: flat line: middle ear disease
C: shifted peak to left: eustachian tube dysfunction
what do they use for newborn hearing screening?
automated auditory brainstem response (AABR)
when ordering MRI for hearing loss, what to specify?
MRI of internal auditory meatus
most important practical management of hearing interventions?
keeping hearing aids on
what’s the most common non-syndromic cause of hearing loss?
connexion 26, genetics, can be progressive
recessive
environmental hearing loss accounts for how many %?
50%
what imaging is best for middle ear anomalies?
CT of petrous temporal bones
aetiology Ax approach?
history:
- perinatal
- postnatal
- development
- family history
examination Ax approach?
syndromic features
growth
neurological exam
standard Ix for bilateral hearing loss?
kidney/thyroid -TORCH serology (rubella, CMV, toxo) -Connexin 26 -MRI family audiometry -ECG -ophthal r/v
what can you miss on a VROA?
unilateral hearing loss
unilateral hearing loss risk of?
speech language disorders
social/emo problems
-academic problems (48%)
connexion 26 hearing loss is bilateral or unilateral?
bilateral
amplification for permanent conductive hearing loss?
bone conductor aids
what investigations for permanent conductive hearing loss?
renal U/S
- spine x-ray
- ophthal
- CT petrous bones (>age 5)
what investigations for permanent conductive hearing loss?
renal U/S
- spine x-ray
- ophthal
- CT petrous bones (>age 5)
if new born screening is normal and you ge these things, may need audiological f/u?
meningitis
major head trauma
mumps and other infections
noise-induced hearing loss
consideration of hearing test post bacterial meningitis, when?
early (as soon as well enough/before discharge)
- due to risk of labyrinthitis ossificans, calcified cochlea, rules out possibility of cochlear implant
