Ears Flashcards
(19 cards)
3 main types of hearing loss
conductive, sensory, neural
where and how does conductive hearing loss occur
outer and middle ear due to impairment of passage of sound vibrations
4 mechanisms of conductive HL
obstruction (cerumen impaction), mass loading (middle ear effusion), stiffness effect (otosclerosis), and discontinuity (ossicular disruption)
most common HL
cerumen impaction or transient eustachian tube dysfunction associate with URI
cause of SNHL
loss of hair cells in cochlea or issue with CN 8
sensory HL not correctable with medical or surgical therapy, focus on prevention or stabilization, EXCEPTION with sudden sensory HL
sudden sensory HL can respond to corticosteroids if delivered within several weeks of onset
what hearing do we lose first
high frequency (think anatomy)
CHL weber and rinne
weber lateralizes to affected ear and BC>AC (negative)
SNHL weber and rinne
think N: normal normal: weber lateralizes to normal ear and AC>BC (positive)
hearing amplification
is hearing aids
how to get cerumen out
detergent ear drops, mechanically, suction, irrigation
examples of detergent ear drops
3% hydrogen peroxide or 6.5 % carbamide peroxide (Debrox)
two things to remember if irrigation
NO TM perforation and warm/body temp water, if room temp or colder vestibular issues
what is used to dry ears
isopropyl alcohol or low setting on blow dryer
if bug in ear what to use to kill it
lidocaine
signs and sx of otitis externa
otalgia, pruritus, purulent discharge
what causes otitis externa
gram neg rod bacteria (Pseudomonas) or fungi (Aspergillus) and moisture/acid disruption/mechanical injury
who is at risk to develop malignant otitis externa
DM and immunocompromised
most common neoplasm of ear canal
squamous cell carcinoma
