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tympanic membrane mobility, ME pressure, static compliance (mass, friction, stiffness), patency of PE tubes, ear canal volume
mass - ossicles, friction - muscles and ligaments, stiffness - footplate of stapes
malformations of the inner ear
michel aplasia (inner ear/auditory nerve fail to fully develop), mondini aplasia (incomplete development of inner/middle/outer ear), scheibe aplasia (most common, membranous portion of cochlea-stria vascularis-organ of corti)
hearing loss noted during first 2 weeks of illness, sensorineural loss, associated with upper respiratory infections, diagnose quickly, watch carefully-->cochlear implant possible, ABR/behavioral testing
rare, fatal, undercooked meat, premature birth, CPalsy, blindness, hydrocephaly, appear normal at birth but symptoms appear later on; 2-7/1000 women affected, 30-40% the fetus infected as well
viral, 50% of time hearing loss occurs, may cause heart disease, eye problems; immunizations key
CMV - cytomegalovirus
most common, harmless to most ppl, causes vision problems, seizures, death, dev/cog. delays, transmitted through breast milk; up to 10-40% of children are carriers; no known treatment
Herpes simplex virus
genital herpes/STD, mother's first outbreak during pregnancy, sensorineural loss, 50% mortality rate
drugs that cause damage, but save life (aminoglycosides, chemotherapy drugs, aspirin/quinine, loop diuretics(if with other ototoxicity drugs will cause problem)
presence of OAEs
little or no conductive loss from ME abnormality; normal OHC function; with sensorineural loss = disorder is retrocochlear
absence of OAEs
with conductive loss = does not eliminate possibility of cochlear/retrocochlear loss; with sensorineural loss = confirms cochlear pathology, but doesn't rule out retrocochlear
patients sleeping, SP(IHCs), AP(distal portion of 8th nerve, IHC-Spiral ganglion), CM(OHCs); 1.5-2ms
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