Flashcards in Hearing Loss Deck (7)
What is the difference between sensorineural and conductive hearing loss?
sensorineural involves the inner ear, cochlea, or auditory nerve
Conductive = any cause that limits external sound into the inner ear.
Outer ear causes of hearing loss?
-Microtia; absence of malformation of auricle
Infection: otitis externa
Trauma: penetrating trauma to EAC
Tumor: MC tumor of EAC is squamous cell carcinoma, benign growths such as exostosis and osteoma
systemic dz: DM or other immunocompromised state
cerumen: Q tips
Middle ear causes of hearing loss
congenital: malformation or fixation of ossicles
ET: viral upper resp tract infection or sinusitis and allergies
Infection: otitis media
Otosclerosis: bony overgrowth of the footplate of the stapes.
Trauma: TM perforation or barotrauma
Inner ear causes of hearing loss
-tumor ototoxic substances
congenital: nonhereditary= insult to developing cochlea, viral infection CMV, hepatitis, rubella, toxoplasmosis, HIV, and syphilis
hereditary: autosomal recessive (Mondini)
Presybycusis: MC cause of hearing loss WORLDWIDE!!!
Infection: MC in adults is viral cochleitis, MC in children is meningitis
Trauma: skull fx
Tumors: acoustic neuroma
Ototoxic substance: abx = aminoglycosides, erythromycin, tetracycline. & chemo = cisplatin
Sx of hearing loss?
-unilateral/bilateral hearing deficit
-difficulty understanding speech, conversations, TV/Radio
Conductive Hearing Loss tx:
Congenital: surgery if possible, bone conduction hearing aid
Otosclerosis: surgery to replace immobile stapes with mobile prosthesis or hearing aid