Disorders of Outer and Middle Ear Flashcards Preview

Audiology > Disorders of Outer and Middle Ear > Flashcards

Flashcards in Disorders of Outer and Middle Ear Deck (23):
1

Auricle Disorders

Doesn't affect hearing, mostly localization
Hematomas can close ear canal if swollen enough
Ex: cancer, animal attacks

2

Atresia

SIGNIFICANTLY impacts hearing
Cartilage, bony portion or whole canal fail to develop
1 or both ears, isolation or other w/ other disorders
*Suspect tympanic membrane & ME cavity involvement
Ex: Treacher Collins

3

Treacher Collins Syndrome

Involves facial bones - face/lower jaw, auricle & atresia of EAC
-Inner ear INTACT, if loud enough should get 100% on WRT
-Can't do Immittance or OAEs

4

Stenosis

Narrowing of EAC
Doesn't cause HL but can lead to blockage (wax/debris)

5

Collapsing Canals

Supraaural headphones during test can cause canals to collapse causing conductive HL
More common in kids/elderly
Use insert headphones!

6

Foreign Bodies

Don't typically cause hearing loss

7

External Otitis

Infection in the skin of the EAC
"Swimmers ear"
Pain, inflammation, mild conductive loss common
If gets to bone: Osteomyelitis - can be very severe

8

Osteoma

Bony tumour/growth in EAC
Conductive loss if it blocks canal

9

Exostoses

Bony projections from canal
Often in cold-water swimmers
Only problematic if occlude EAC

10

Cerumen

Wax only problem if completely occludes canal

11

TM Perforations

Rupture from ME pressure buildup, trauma, explosions, thunder clap
*Side and place of perf = variations in amt of hearing loss/configuration

12

Surgical Repair of TM Perforation

Myringoplasty
-Use fascia to cover TM
-If can get eardrum seal, Equivalent Ear Canal Volume (immitance) will be abnormally large b/c middle ear space included in measurement

13

Tympanosclerosis

Thicking of TM
Results from previous infections
If scar tissue has large mass, may contribute to HL

14

Otitis Media

Ear infection in mucous membrane lining of ME
>70% of children before age 2
Focus on pain management

15

External & Internal Factors in OM

External: cigarette smoke, fumes
Internal: eustachian tubes, barotrauma, anatomical deformities, immune system, age, race (aboriginal), SES, gender (male)

16

Early OM

Type C tymp
Small effect on hearing
Retracted TM

17

Serous OM

Fluid in ear but no infection
Type C or B
Slight effect on hearing

18

Acute OM

Type B
Definite conductive loss
Red, inflammed TM (bulges out)
No reflexes - if stiff system (no compliance)

19

Mastoiditis

Common in BAHA patients
Pus can invade mastoid breaking down walls & separating air cells
Can lead to meningitis and death
Surgical Tx: Mastoidectomy

20

Mastoidectomy

Treatment for mastoiditis
Bigger scraping out of the canal
Abnormally large equivalent volume
May not be able to seal
Conductive loss (maybe mixed)

21

Cholesteatoma

Pseudocancer (not malignant)
Abnormal growth of skin in ME, forms onion-like rings of tissue
May cause: ororrhea (foul smelling drainage), otalgia (ear pain)
Treatment: surgery

22

Otosclerosis

Bony growth (usually around stapes)
Hereditary in (70% of cases)
Conductive HL
White women (often during preg, menopause)
May have tinnitus
Paracusis Willisii (lombard reflex)

23

Audiometric Info for Otosclerosis

1st symptom: low air-bone gap
Carhart Notch @ 2000 Hz (worse BC than expected)
Mass will first affect high Hz
Stiffness will effect low Hz 1st
Type As tymp (shallow)
No OAEs (sound can't come back out)
No reflexes (too stiff)
Treatment: clear growth, put stapes prosthetic, BAHA if hearing aid/surgery doesn't work