ENT2 Flashcards
what afferent pupillary defect look like
what does it mean
thee affected pupil doesn’t constrict symetrically when a light is moved from one eye to the other
what will the swinging flashlight test look like
the consensual pupillary reflex will be diminshed in the good eye when the light is shined in the affected eye
causes of afferent pupillary defect
retinal detachment (total)
optic nerve damage
causes of acute vision loss
macular disease
retinal detachments
vein occlusions
arterial onclusions
vitreous hemorrhage
optic nerve trauma
“functional vision loss”
SS macular degeneration
metamorphosia
central scotoma
metamorphosia
a symptom of macular degeneration where a grid of straightlines will appear wavy and some parts of the grid will look black
central scotoma
a symptom of macular degeneration where the middle part of the visual field looks black
why is afferent pupillary defect diagnostically valuable
because you can assess the function of the afferent and efferent nerves in both eyes from one
what would cause a bitempral visual field defect
lesion at the optic chiasma
how would a lesion in the optic tract behind the optic chiasm manifest
contralateral homogogenous hemianopsia (vision lost on the nasal ipsilateral and the temporal contralateral side)
T/F macular degeneration is painless
true
blood under the retina is indicative of what
macular degeneration
intact confrontational visual fields with poor vision is indicative of what
central scotoma from macular degeneration
VEGF inhibition
vascular enthothelial growth factor inhibition, treatment for macular degeneration
what causes macular degeneration
vascular overgrowth in the retinal pigmented epithelium precipitated by an defect
symptoms of retinal detachment
new floaters
flashing lights (photopsia)
visual field loss
what causes retinal detachment
tears that allow the vitreous humor to escape the posterior chamber and flow behind the retina
what is the goal of the scleral buckle
to fix retinal detachment by indenting the posterior eye to remove traction on the retina from the vitreous
vitrectomy
scope operation that fixes retinal detachment by draining the vitreous from behind the retina then putting an air bubble in the vitreous chamber to tamp down the retina
pneumatic retinopexy
repair of a retinal tear on the superior portion of the retina tha tuses are an air bubble in teh vitreous chamber to tamp down the tear why whe pigemented retinal cells pump out eh vitreous
branch retinal occulsion
ischemia in the retina related to HTN caused by a blockage int he retinal veins that releases VEGF`
central RVO
central retinal vein occulsion that can cause blindness of varying severity with no real treatment
caused by compression around teh optic nerve
Branch retinal artery occusion
blockage of the artery associated with carotid/cardiac dieases
may be considered emergent
hollenhort plaque
a piece of cholesterol or calcium from the carotid or heart valves that has lodged in a retinal artery
correlated with high risk of stroke
in central retinal artery occulsion, why would the fovea be red
causes
treatment
because the fovea doesn’t get much blood from the arteries of the eye
thrombosis, embolism
usually untreatable
ciloretinal artery
a branch of the retinal artery that has left the optic nerve and found a different way into the retina
SS optic neuritis
gender bias
imaging
MS
pain with eye movement
APD
usually makes a complete recovery
more young women
MRI is advisable
describe ischemic optic neuropathy
usually optic nerve swelling
usually irrerverislbe
artheritic or non arteritic, both usually in the eldery
describe arteritic ION
elderly women
related to PMR (tender scalp, headache, fever, jaw pain)
can progress to giant cell arteritis
treatment for arteritic ION
stat esr, CRP
immediate referral
start high dose steroids
schedule biopsy
describe non arteritic ION
No GCA symptoms
small disc cup
other involved 25-50%
might be related to nocturnal hypotension
what is one tool that can help localize the location of a stroke
central visual field defect
patient presents with a trauma that lacerates the retina
what might be sequela from this
some visual field lost from retinal artery occlusion
signs of background diabetic retinopathy
dot/blot hemorrhages
hard exudate
cotton wool spots
intraretinal microvascular abnormalities
what causes vision loss in background diabetic retinopathy
macular edema
what is the treatment of diabetic macular edema
advantages
focal laser
painless, mild side effects, reduces severe vision loss by half
pars plana
the area of the eye that can be incised without damaging other structures to allow access to the vitreous and retina
T/F presence of a fovea reflex indicates diabetic macular edema
false, it indicates good retainal health
what do cotton wool spots indicate in terms of progression in diabetic retinal edema
very davanced disease
what is the goal of laser treatment of diabetic edema
but
it coagulate microaneurysms
only 1 in 7 will regain vision
future treatments of DME
surgery
steroids
VEGF inhibitor
oral meds
proliferative diabetic retinopathy
neovascularization of the retina that causes the secretion of VEGF and infiltration of the vitreous
factors that are cocerning for proliferative diabetic retinopathy
can cause true blindness, esp in DM I
important to look for uncontrolled DMI as teens
treatments for PDR
laser
surgery
VEGF injections/steroids
PDR laser treatment
considerations
a more extensive laser treatment
more extensive, treats peripheral retina, can be painful, reduces side/night vision
pars plana vitrectomy
surgical removal of part of the vitreous
diabetic screening for retinal health
DM I, yearly dilated exams starting a puberty or within 5 years of diagnosis
DM II, at diagnosis and yearly after
Gestational: in the first trimester, each trimester as indicated
talking points for patients about diabetic eye disease
most damage is assymptomatic
control is of the ut must importance
encourage them to take charge
DMII can be managed with diet and exercise
T/F HTN is a direct cause of vision loss
false, it can cause many eye issues indirectly
how does HTN affect the eye
worsens DR
vein/artery occlusions
aneurysyms
optic nerve issues
macular degeneration
HTN related signs of poor retinal health
arterial narrowing
AV nicking
exudate
optic nerve swelling
common cause of blindness related to HIV
CMV retinitis
patient presents with hard exudate but no DM or HTN
what might be the cause
hyper lipidemia
retinal side effect of plaquenil
screening
toxicity that can cause bullseye maculopathy
need to have eye exam yearly
T.F maculopathy from plaquenil is reversible
false
structures of the outer ear
auricle and ear canal
strucutres of the middle ear
tympanic membrane, ossicles, middle ear space
structures of the inner ear
cochlea, semicircular canal, internal auditory canals
types of hearing loss
conductive, sensorineural, mixed
what will cause conductive hearing loss
dysfunction of the EAC, TM, or ossicles
what will cause sensorineural hearing loss
dysfunction of the cochlea or neural components of the auditory system
what are the weber and rinne tests used for
to differentiate between senory and conductive hearing loss
what will happen during the weber test if there is CHL
SNHL
normal
CH - sound lateralizes to the bad ear
SNHL - sound lateralizes to the good ear
normal hearing - sound hear equally in both ears
what will happen in a rinne test with normal hearing
CHL
SNHL
air condicution will be better than bone
bone conduction will be equal or better than air
ac conduction will be better than bone
typical causes of conductive hearing loss in the outer ear
wax
otitis externa
trauma
exostosis
osteoma
squamous cell carcinoma
middle ear causes of conductive hearing loss
otitis media
cholesteatoma
otosclerosis
TM perforation
Eustachian tube issue
middle ear barotrauma
causes of SNHL
prebycusis
ototoxic drugs
meniere disease
acoustic neuroma
MS
autoimmune
auricular hematoma
presentation
treatment
complications
tender, fluctuant collection of blood floowling a blunt trauma
drainage, pressure to keep the hematoma from forming, ABx
infection, recurrance, hematoma, cauliflower ear
consideration of treatment for cerumen impaction
treat symptomatic patients
keep in mind you don’t know what is behind the wax
sometimes a patient cannot adequately express their symptoms
what age is most likely to present with a foreign body in the EAC
6
treatment for EAC foreign object
presentation
what types of objects require immediate action
hearing loss, otalgia, otorrhea
penetrating foreign bodies, batteries, live insects
what should be used to kill life insects in the ear
ethanol, mineral oil, lidocaine
common causes for otitis externa
what bacteria are the most common vectors in otitis externa
infection, allergy, dermatological reasons
pseudmonas and staphylococcus
ramsay huny syndrome (herpes zoster oticus)
definition
presentation
an otologic complication of the herpes zoster virus
ipsilateral face paralysis, ear pain, vesicles in the auditoy canal and auricle
clinical presentation of otitis externa
otalgia, itching, ear fullness, possible hearing loss
tenderness at the tragus or pinna
diffuse ear canal edema, erythema
purulent otorrhea
treatment for otitis externa
are ABx always nessasry
Aural toliet
topical therapy with steroids
analgesics
no ABx unless there is an extenstion out side the ear canal or comorbities that raise concern (diabetes, immune deficiency
Eustachian tube dysfunction
etiology
presentation
commonly associated with edema of the URT (viral URI or allegery)
earfullness, popping or cracking when swallowing, mild to moderate hearing loss, retraction or decreased mobility on pneumatic otoscopt
typical presentation of an Overly patent eustachian tube (a.k.a. patulous eustachian tube)
treatment
autophony (exaggerated ability to hear ones breathing and voice)
directed at treating an underlying condition
typical cause of barotrauma
usually flying or scuba diving, in conjuction with an ET dysfunction that prevents equalization
barotrauma
presentation
prevention
referral?
ear pressure, hearing loss, otalgia, tinnitus
avoid activities that might cause injury
if there is SNHL or dizziness, but most will heal on their own
medical prevention of barotrauma
decongestants, antihistamines
causative factors for TM perforation
barotrauma, foreign body injury, infection
what determines the presentaion of hearing loss with TM perforation
depends on the size and location of the perforation
treatment of TM perforation
treat causative factor
most heal on their own, refere for surgical correction
mastoiditis defined
presentation
common complication of acute otitis media that is associated with mastoid bone destruction
fever, post auricular erythema/tenderness, ear proptosis, acute otitis media on otoscopy
how does mastoiditis present on CT scan
loss of mastoid air cells and local bone destruction
treatment of mastoiditis
IV ABx directed against staph pneumo, h flu, strep pyo
myringotomy (incsion of the TM to drain fluid)
mastoid ectome if medical therapy fails
otosclerosis
process in which the stapes loses mobility by excessive bone growth at the oval window
presentation of otosclerosis
treatment
slowly progressive conductive hearing loss that is usually bilateral and assymetric
tinnitus, SNHL
refer to ENT for hearing amplification or surgery
two categories of causes leading to vertigo
peripheral (benign paroxsysmal positional vertigo)
central (MS)
DDx for tinnitus
SNHL (most common)
neuro
ototoxic meds
infection
metabolic disorders
autoimmune
vascular disorders
DDx for tinnitus: neurologic
MS, Tumor
DDx for tinnitus: ototoxic meds
aminoglycosides, cisplatin, aspirin, loop diuretics
DDx for tinnitus; infection
rubella, neurosyphylis, lymdisease
DDx for tinnitus: metabolic disorders
thyroid, chronic renal failure
DDx for tinnitus: autoimmune
RA, SLE
DDx for tinnitus
when to suspect a vascular cause
lab studies?
when the tinnitus is pulsatile
contrast CT, MRI, and angiography
benign paroxysmal positional vertigo etiology
most commonly associated with calcium debris of the posterior semicircular canal (canalthiasis)
benign paroxysmal positional vertigo presentation
recurrent episodes of vertigo lasting one minute or less provoked by sudden head movement
positive dix hallpike manuver with characteristic nystagmus
benign paroxysmal positional vertigo treatment
particle reposition with the epley manuver
labyrinthitis etiology
unknown, maybe viral infection
labyrinthitis presentation
vertigo lasting for several days to a week accompanied by hearing loss
labyrinthitis treatment
vestibular suppressants
anti emetics
corticosteroids
T/F labyrinthtis will recover completely with with time
false, patients my have sporadic vertigo and might never regain hearing
meniere disease etiology
possible fluid in the ear due to abnormal ion homeostasis
meniere disease presentation
episodic vertigo
SNHL that fluctuates and typically affects lower frequencies
tinnitis
aural fullness