Otic Flashcards
Most ear disease observed in practice involves what?
Dermatopathology of the external ear
What’s going on with this goat ear?
Dermatophilosis
How is otitis externa acquired?
What are some predisposing factors?
Secondary bacterial/fungal infections (Staphylococcus, Pseudomonas, Proteus, Malassezia)
allergic skin disease (atopy, food allergy); ectoparasitism; foreign bodies; conformation - pendulous ears, hair; moisture - swimmers, tropical climate
What are some consequences of otitis externa?
Fibrosis
Adnexal atrophy and hyperkeratosis
Osseous metaplasia of cartilage –> stenosis of acoustic meatus
Constant ear infections
Middle/inner ear infection
What is going on with this ear?
Suppurative otitis media
What are the portals of pathogen entry into the middle ear?
Extension through perforation of the tympanic membrane
Ascension of the auditory tube
True or false -
Otitis media is almost never bacterial?
False it’s almost always bacterial
What are underlying factors predisposing to otitis media?
Functionality of auditory tubes
Immunocompetency
What are some consequences of otitis media?
Inflammation (myringitis) or perforation of tympanic membrane
Erosion of auditory ossicles
Horner’s syndrome
Osteosclerosis of the tympanic bulla
Formation of inflammatory polyps
Progression to otitis interna
What is another name for otitis interna?
Labyrinthitis
What is the portal of pathogen entry to the internal ear?
Extension from otitis media +/- osteomyelitis of petrous temporal bone
What are some consequences of labyrinthitis?
Extension through the internal acoustic meatus along CN VIII –> meningitis
Vestibular disease - head tilt, ataxia, nystagmus, circling, facial paralysis
Sensory hair cell loss - permanent hearing impairment
