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Terms in this set (43)
3 Types of Hearing Loss
Conductive, Sensory, Neural
Conductive Hearing Loss
Dysfunction of External or Middle Ear
4 Main Mechanisms of Conductive Hearing Loss
Obstruction (cerumen), Mass Loading (middle ear effusion), stiffness (osteosclerosis), discontinuity (ossicular disruption)
Sensory Hearing Loss
deterioration of cochlea,
Sensory Hearing Loss normally seen as
presbyacusis (progressive high frequency loss with age)
Neural Hearing Loss
lesions of 8th nerve, auditory nuclei, ascending tracts, or auditory cortex.... Least common
Causes of neural hearing losss
acousticneuroma, MS, auditory neuropathy
So what is Sensorineuro hearing loss?
Since Sensory and Neral Hearing loss are often indistinguishable we often combine the two into one category.
With the Weber Test, in conductive loss, the sound appears louder in the _________ ear
poorer hearing hear
What type of hearing loss creates a gap between air and bone thresholds?
Conductive..... Because if Cochlea isn't working then you won't hear anything either way.
Idiopathic Sudden Sensorineural Hearing Loss
Immediate Referral --> corticosteroids
For pt with conductive hearing loss, what kind of hearing aid?
Bone-conducting hearing aid to directly stimulate ipsilateral cochlea
For pt with sensory hearing loss what kind of hearing aid?
Cochlear implant --> stimulates auditory nerve.
Lower part of TM, 3 layers thick
Upper part of TM, 2 layers thick
Bone you see through the TM
End of theMalleus is called the
Smalles skeletal muscle, Stabilizes the stapes
Describe Eustachian Tube in Adults and Children
More horizontal in kids till age 7... In adult it's more of a 45 degree angle.
Purpose of Eustachian Tube
Middle Ear Ventilation
Where is the inner ear housed?
Petrous Portion of the Temporal bone
Utricle and Saccule
otolith organs --- use small stones and fluid to stimulate hair cells to detect motion
Primary Organ of Hearing
typical audiometry test, quantifies hearing loss. ...GOLD STANDARD...
Hearing Loss considered if
hearing threshold level is > 25 dB more than "the norm" (0)
Speech reception threshold- mesured intesntity that speech is recognized. -- patient reads words and examiner reports intensity at which patient repeats
measured impedence of iddle ear to acoustic energy. Does not require pt participation. Used to screen kids for middle ear effusion.
What can estimate middle ear pressure?
Type A finding of Tympanometry
Type B finding of Tympanometry
Otitis Media with Effusion, TM perforation... (Flat Line)
What is Otitis Media with Effusion (OME)
Same as Secretory Otitis Media. ...nonpurulent effusion of middle ear that may be mucoid or serous, Sx are hearing loss or ear fullness, but typically don't have pain or fever.
Type C finding of Tympanometry
Eustachian Tube Dysfunction...... Left Shift
Acoustic Reflex Test
Test for neurlogic function--- stapedius and tensor tympani muscles contract in response to loud sound tightening TM
non-organic hearing loss is
functional hearing loss is
Sudden Onset Hearing Loss is a
Otoacoustic Emissions Test
Otoacoustic emissions are given off by inner ear when cochlea is stimulated. This "echoing" can bem easured by a probe in the ear canal. People with normal hearing produce emissions. Often part of newborn hearing screening.
Auditory Brainstem Response Test (ABR)
participation not required. Gives info about inner ear. Paste electrodes to head and record brain activity in response to sound. Person rests quietly while the test is performed. When used as screening only 1 intensity is checked so baby either passes or fails.
Another Name for ABR test
Auditory Evoked Potential (AEP) test
Severe Sudden Vertigo caused by inflammation of semicircular canals. Likely Viral
Another Name for Acoustic Neuroma
small tear or defect in thin membranes of oval or round window allowing perilymph to leak in to middle ear... ....... Changes in air pressure normally don't affect inner ear, but now they can.............Most often Sx are ear fullness, fluctuant hearing, dizziness without true vertigo motion intolerance. ..............Also, If perilymph is lost it is replaced by CSF and may decrease brain CSF --> may cause headache.
oversensitivity to certain frequency and volume ranges
THIS SET IS OFTEN IN FOLDERS WITH...
Infectious Myringitis, Otosclerosis, Serous Otitis…
Head and Neck Cancers
ENT - Oral Health
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