Outer Ear Pathologies Flashcards
The pinna
-size and shape varies from person to person
Gathers sound from the environment and funnels it to the eardrum
Made entirely of cartilage and covered with skin
Outer ear disorders
1 structural defects due to embryo logic malformations
2 structural changes secondary to infection or trauma
Microtia and atresia
Congenital
Malformations of auricle and EAM
Together/separate
Uni/bi
Microtia
Abnormal smallness of auricle and one of several congenital auricular malformations
Doesn’t affect hearing sensitivity
Surgically corrected
Atresia
Absence of opening in EAM
Uni/bi
Usually accompanies auricular or ME malformations
Bony atresia
Congenital absence of ear canal due to a wall of bone separating the EAM from the ME
Membranous atresia
A dense soft tissue plug is obstructing the canal
Atresia audiological consequences and treatment
Significant conductive hearing loss
60dB ABG; flat configuration
Surgical
Impacted cerumen
Conductive
Mild
Flat
Medically
Perforation of the tympanic membrane
Due to trauma or secondary complication of OM
May or may not cause HL
Audiologic consequences and treatments of Tm perforations
Conductive
Flat or rising
Surgical
Other disorders of the outer ear
Cancer, infections, neoplastic growths
Otitis externa
Bacterial infection
Allergic reaction
Swimmers ear
Medication
