ENT (audiometries) Flashcards
What does the following symbol: O mean?
Air conduction: Right ear unmasked
What does the following symbol: △ mean?
Air conduction: Right ear masked
What does the following symbol: X mean?
Air conduction: Left ear unmasked
What does the following symbol: ▢ mean?
Air conduction: Left ear masked
What does the following symbol: < mean?
Bone conduction: Right ear unmasked
What does the following symbol: [ mean?
Bone conduction: Right ear masked
What does the following symbol: > mean?
Bone conduction: Left ear masked
What does the following symbol: ] mean?
Bone conduction: Left ear masked
What is the hearing threshold for normal hearing?
Can hear quiet sounds of less than 20dB
What is the hearing threshold for mild hearing loss?
Hearing loss between 20 – 40dB
What is the hearing threshold for moderate hearing loss?
Hearing loss between 41 – 70dB
What is the hearing threshold for severe hearing loss?
Hearing loss between 71 – 95dB
What is the hearing threshold for profound hearing loss?
Hearing loss over 95dB
Air-bone gap is found in which conditions?
Conductive or mixed hearing loss attributed to outer- and/or middle-ear diseases such as otitis externa, tympanic membrane perforation, interruption or fixation of the ossicular chain, and chronic suppurative otitis media
Interpret the following audiogram
Normal hearing
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Sensorineural hearing loss (right ear)
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Conductive hearing loss (right ear)
Give examples of sensorineural hearing loss
Vascular, viral, inflammatory or immune-mediated causes
Noise-induced hearing loss
Presbyacusis
Vestibular schwannoma
Give examples of conductive hearing loss
Any obstruction to the ear canal (e.g. wax, foreign body, furuncle, oedema)
Perforation of tympanic membrane
Fluid in the middle ear (e.g. glue ear, otitis media)
Any disruption of ossicles (e.g. trauma)
Interpret the following audiogram
Presbyacusis - bilateral and symmetrical hearing loss above 2000Hz. Overall down-sloping line representing impaired hearing at higher frequency sounds
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Noise-induced hearing loss - notch at 4000 Hz
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Meniere’s disease (right ear) - low-frequency sensorineural hearing loss.
Interpret the following audiogram
Otosclerosis (right ear) - conductive hearing loss with loss in bone conduction at 2000 Hz (referred to as Carhart’s notch)
