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Abnormal Ears

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sandyle909's version from 2016-09-06 03:05

Section

Question Answer
Abnormal Conduction problem conducting sound waves (EAC, TM or middle ear)
abnormality usually visible
Sensorineural disorder of the inner ear, cochlear n. (CN VIII) impairs transmission of nerve impulse to brain
abnormality NOT visible
Weber Test (Test for Lateralization) place vibrating tuning fork on the top of the head
ask patient: where do you hear the sound?
normal - sound heard in both ears
abnormal - sound lateralizes
Conduction loss - BC>AC in impaired earsound lateralizes to impaired ear
sound is heard best in impaired ear
Ex: plugging up your ears (outside noise eliminated)
Otitis Media, perforation, cerumen, otosclerosis, etc.
Sensorineural Hearing Loss (SNHL) AC>BC in both earssound lateralizes to good ear
Ex: Presbycusis (age related hearing loss), noise exposure, head trauma
2 Types of Conduction AC - sound transmitted through air (EAC, TM, middle ear)
BC - sound transmitted through bone vibrations
normal: AC>BC
BC>AC = conduction loss
AC>BC= could also be SNHL
Rinne Test evaluates AC v. BC - place tip of vibrating tuning fork on mastoid bone; ask patient if they can hear it; have them tell you when it stops. Move tuning fork in front of ear; ask if they can still hear it. If they can still hear the sound, then AC>BC - normal
Unilateral conduction lossBC>AC
sound heard through bone longer than heard through air
Unilateral SNHLAC>BC
inner ear or CN VIII
less able to transmit impulses, so normal pattern prevails (Both AC and BC decreased equally)
Gouty Tophideposits of uric acid crystals
occurs after years of chronically elevated uric acid in tophaceous gout
Basal Cell CA, Squamous Cell CABasal Cell CA - raised nodule with central telangiectasia
Squamous Cell CA - crusted border, central ulceration, bleeding
Normal TMcone of light - anterior and inferior
Perforated TM *scarring and obscured landmarks
Acute Otitis Media *bulging, erythematous TM
Tympanosclerosis *chalky white patch
scarring of the TM
common with recurring bouts of OM, hx of tubes, or previous perforations
Serous Effusion with Air Bubbles * cause: viral upper respiratory infection (URI), barotrauma
Eustachian tube dysfunction
s/s: fullness in ear, popping in ear
TM with Myringotomy Tube *remains in ear 6-10 months
uses: repeated bouts of OM, persistent effusion, hearing loss
Bullous Myringitis *viral infection
painful, hemorrhagic vesicles
+/ - hearing loss during infection
External Otitis aka: Otitis Externa * Infection of external auditory canal
drainage and edema of the canal
*tenderness with movement of tragus and pinna
memorize