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Overview of Sites of Lesion
Terms in this set (28)
What does the site of lesion mean
SITE = LOCATION
LESION = PROBLEM
Conductive Hearing Loss - what does it block and the location?
a loss of hearing sensitivity caused by blockage of sound before sound gets into the middle ear
location: ear canal or middle ear
What are the conductive loss examples?
> Wax Blockage
> Fluid in the middle ear
> Break in the ossicular chain
> Tumor in the middle ear
What are the conductive loss symptoms?
> Sound is too soft
> Loss is generally worse in the low frequencies
> May experience the occlusion effect
> Sometimes hear better in loud, noisy situations
> Medically treatable
> If treatment is not an option, the patient will do well with an HA
Treatment of Perforation
Most patients with an traumatic tympanic membrane perforation do not require any specific treatment - excellent chance of healing spontaneously
especially true for central perforation
strict dry ear precautions are best followed to prevent water from getting into the ear.
Patients with TM perforation due to repeated ear infections are a different story
> underlying problem (eustachian tube dysfunction)
> will probably not heal spontaneously
What are the surgery options for non healing perforations?
Paper patch: myringoplasty
Formal (skin): tympanoplasty
What are the evidence of prior perforations?
> scaring where the perforation spontaneously healed
> white patch on the TM
> "False" TM
> Incomplete healing - missing the middle, fibrous layer
What is the definition of cochlear hearing loss?
A loss of hearing sensitivity due to damage to the inner ear. A nerve impulse is not generated due to the loss
Where is the location of cochlear hearing loss?
What are the examples of the cochlear hearing loss?
Damage to hair cells
> Noise Exposure
What are the symptoms and Facts about Cochlear Loss
> It is usually BILATERAL
> It affects high frequency hearing first
- constant sounds are high pitch and often give meaning to words
- vowels are low pitch
> so the person can HEAR, BUT NOT UNDERSTAND
> Difficulty hearing in noise
> Dizziness is rarely present (the exception is MENIERE'S DISEASE)
> Medical treatment is not an option
Cochlear loss is not just a loss of audibility of all sounds, how does speech perceive?
> Speech may sound muffled
> Speech is not always easier to hear if it is louder
> The damage to the cochlea may cause distortion
Recruitment is a hallmark of cochlear loss.
What is recruitment?
Its the abnormal growth of loudness.
> soft sounds are not heard but loud sounds are heard as
Dynamic Range (usable hearing) shrinks
Several audiological tests look at recruitment
How are cochlear losses treated with?
> the degree of success with hearing aids varies between
> size and internal circuitry may need to be different for different users
Definition of Retrocochlear Loss
Hearing difficulty caused by damaged to the retrocochlear structures
What are the examples of Retrocochlear loss occurring?
> Tumors on the VIII nerve
> Car accident causes brainstem trauma
> Diseases such as MS
What are the symptoms of retrocochlear "involvement"?
> Often the person has both cochlear and retrocochlear damage
> e.g. a tumor is cutting off blood supply to the ear and
damaging the VIIIth nerve
> Usually UNILATERAL
> The loss may be mild to severe
> Sound is distorted or unclear
What are the two things that are common in Retrocochlear loss
> Dizziness (as the vestibular branch of VIIIth nerve may be involved -- VIII nerve tumors)
Will retrocochlear loss have a recruitment?
Will hearing aids be helpful for a patient with retrocochlear loss?
Does the basic testing for Sensorineural Hearing Loss distinguish cochlear from retrocochlear hearing loss? What does the loss is generally referred to?
Which one is bilateral and which is unilateral?
Cochlear is bilateral
Retrocochlear is unilateral
Where is hearing difficulty due to damage for sensorineural hearing loss?
Sensori - cochlea
Neural - nerve
Hearing difficulty due to damage in the inner ear or beyond
"Cochlear" and "Retrocochlear" problems may be classified as:
What is the definition of mixed hearing loss?
If a hearing loss has a conductive component and a sensorineural component
A loss that is partially conductive and partially sensorineural
Location and examples of mixed hearing loss?
Examples: TM, Ear wax, perforation
Does all of the hearing loss have the same characteristics?
If not, what does the characteristics vary by?
Site of lesion and severity
For each symptoms, describe the probable loss type: (cochlear or retrocochlear)
1. everything sounds distorted
2. Both ears are generally affected
3. The loss is generally unilateral
4. Tinnitus is fairly common
5. Dizziness is fairly common
6. Audiological evaluation shows signs of recruitment
7. The loss is generally worse in the high frequencies
THIS SET IS OFTEN IN FOLDERS WITH...
Overview of AP 1
Otoscopy Normal vs Pathology
Masking Pure Tones And Speech
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