ENT and pumonary - PC 617 - Sheet1 Flashcards
C
Near vision card, penlight with blue filter, topical anestetic, fluorescein strips, topical mydriatic
Cranial nerves 2-7 control
Pupils, visual fields, EOMs, facial droop
Inspection/palpation of eye and surrounding structures
Assess for asymmetry, proptosis, enophthalmos, orbital rim
Slit lamp exam assess…
Anterior segment of the eye
Fundoscopy assesses….
Posterior segment of the eye.
Contraindication to dilation of eye
Significant head trauma, suspected rupture, history of glaucoma
Assessment of intraocular pressure
Goldman applanation tonometry, Tonopen
Exam of anterior segment of the eye
Perform at slit lamp - or ophthalmascope. Inspect conjunctiva, cornea, anterior chamber, iris, lens
Estimating anterior chamber depth of the eye
Shine a light from the temporal side of the head across the front of the eye parallel to the plane of the iris. Look at the nasal aspect of the iris. If two thirds or more of the nasal iris is in shadow, the chamber is probably shallow and the angle narrow.
Tonometry
Measures the intraocular pressure by calculating the force required to depress the cornea a given amount with a tonometer
Normal intraoccular pressure
10 - 20 is normal
IOP and chronic open angle glaucoma
Can be 20-30
IOP and acute angle closure glaucoma
Can be greater than 40
The swinging flashlight test
Measures both the direct and consesual response of pupil to light
Steps of the swinging flashlight test
- Shine light in right eye. This will cause BOTH pupils to constrict via CN III through Edinger-Westphal nucleus. 2. Then swing pen light to left and ensure the left eye CONSTRICTS. If it constricts, this means that the LEFT CN II is intact and is causing a direct pupillary reflex. If it dilates, then this is a sign that the LEFT retina or optic nerve is damaged and is called an Afferent pupillary defect (APD).
Assessment of posterior segment of the eye
Vitreous, optic disc, retinal vessels, macula
Key worrisome clinical findings - ophtho referral needed
Pain - pain in eye often indicates more serious intraocular pathology (iritis, glaucoma); Visual acuity - if decreased, usually more serious cause; Pupil - if sluggish, worry about acute glaucoma; Pattern of redness - ciliary flush (redness worse near cornea, usually serious intraocular cause: iritis or glaucoma)
Ciliary flush
Injection of deep conjunctival vesels and episcleral vessels surrounding the cornea. Seen in iritis or acute glaucoma. NOT seen in simple conjunctivitis
Iritis
Inflammation in the anterior chamber
Red eye - Key historical questions
Do you have any pain? Do you wear contacts? Do you have any associated symptoms
Pain in eye
Biggest distinguishing factor between emergent and non-emergent
Wearing contacts and eye history
Increased risk of keratitis-corneal infection
History of associated eye symptoms
Decreased vision, photophobia/diplopia, flashes/floaters, halos/N/V/abd pain. Any requires a referral
Main differential of red eye
Conjunctivitis (infectious/noninfectious), trauma - foreign body, subconjunctival hemorrhage, acute closure glaucoma, iritis/uveitis, keritits, scleritis - episcleritis
Ocular emergencies
Closed-angle glaucoma; retinal detachment; foreign body; orbital fractures; corneal abrasions; lacerations, ulcers; chemical burns; ruptured globe; CRAO; retrobulbar hematoma
Acute angle closure glaucoma (AACG) diagnosis
History - acute onset, higher risk in far-sighted; symptoms - pain, halos (around lights), visual loss (usually peripheral), nausea/vomiting; Signs - conjunctival injection, corneal edema, mid-dilated, fixed pupil, increased IOP
Pathophysiology of glaucoma
Aqueous humor produced by ciliary body, enters anterior chamber, drains via trabecular meshwork at angle to enter canal of Schlemm. In AACG, iris obstructs trabecular meshwork by closing off angle. Optic nerve damage secondary to increased IOP.
Treatment of acute angle closure glaucoma
Reduce production of aqueous humor - topical b-blocker (trimolol 0.5% - 1-2 gtt), carbonic anhydrase inhibitor (acetazolamide 500 mg IV or PO), systemic osmotic agent (mannitol 1-2 g/Kg IV over 45 min) OR increase outflow - topical a-agonist (phenylephrine 1gtt), miotics (pilocarpine 1-2%) ALSO topical steroid (prednisolone acetate 1%) 1gtt Q 15-30 min x 4 then q1h
Definitive treatment of acute angle closure glaucoma
Optho referral - laser peripheral iridectomy
Pathophysiology of retinal detachment
Separation of neurosensory layer of retina from underlying choroid and retinal pigment epithelium. Schaffer’s sign
Schaffer’s sign
Presence of vitreous pigment. Useful in that it has a NPV of 99% for detachment
Risk factors for retinal detachment
Increasing age, history of posterior vitreous detachment, myopia (nearsightedness), trauma, diabetic retinopathy, family history, cataract surgery
Signs and symptoms of retinal detachment
“black curtain coming down over visual field”, bright flashes of light (photopsia), increasing floaters, decreased visual acquity, distortion of objects (metamorphopsia), +APD on exam
Diagnosis of retinal detachment
If direct ophthalmoscopy is inconclusive, refer to ophtho for dilated fundux exam with indirect ophthalmoscope. Direct ophthalmoscopy is not very effective at visualizing periphery where most RD’s occur
Treatment of retinal detachment
Surgery to replace retina onto nourishing underlying layers. Surgical options include laser photocoagulation therapy, and scleral buckle with intraocular gas bubble to keep retinal in place while it heals
Key management point of retinal detachment
Know “classic” presentation so you can refer to an ophthalmologist quickly
Foreign body
Often metallic following work injury.
Signs and symptoms of foreign body
Foreign body sensation, tearing, red, or painful eye. Pain often relieved with the instillation of anesthetic drops.
Assessment of foreign body
Stain with fluorescein stain and illuminate under blue fluorescent light (Wood’s lamp) is effective to see corneal epithelial defects
Treatment of corneal foreign body
Apply topical anesthetic. Remove foreign body with sterile irrigating solution or moistened sterile cotton swab. Never use a needle. Apply antibiotic ointment. 24-hr follow-up is mandatory. Refer if foreign body cannot be removed.
Signs and symtpoms of orbital blowout fracture
Enophthalmos; diplopia; impairment of eye movement secondary to EOM entrapment; orbital hemorrhage or nerve damage; orbital emphysema; infraorbital n. anesthesia
Diagnosis of orbital blowout fracture
CT should include axial and coronal cuts
Disposition of orbital blowout fracture
If no diplopia, minimal displacement, and no muscle entrapment, discharge with ophthalmology follow up within a week
Treatment of orbital blowout fracture
Surgery - for enophthalmos, muscle entrapment, or visual loss
Management of orbital blowout fracture
Ice packs beginning in clinic/ED and for 48 hrs will help decrease swelling associated with injury. Elevate head of bed (decrease swelling). If sinuses have been injured, give prophylactic antibiotics and instruct patient not to blod nose. Treat nausea/vomiting with antiemetics.
Coroneal injuries
Abrasions, lacerations, ulcers
Symptoms of corneal injuries
Extreme eye pain, relieved with lidocaine drops. Visual acuity usually decreased, depending on location of injury in relation to visual axis. Inflammation leading to corneal edema can decrease visual acquity
Diagnosis of corneal injuries
Fluorescein staining to see epithelial defect. Seidel’s test for aqueous leakage to diagnose laceration.
Seidel’s test
Concentrated fluorescein is dark orange but turns bright green under blud light after dilation. This indicates aqueous leakage which is diluting the green dye.
Management of corneal injury
Topical antibiotics and follow up with ophthalmologist. For lacerations, 1cm, refer to ophthalmologist to rule out globe rupture and for possible suture placement. Avoid contact lenses. Avoid patching.
Chemical burns
Constitutes an emergency. Every minute counts. Do not waste time on history or physical exam. Alkali burns more common and worse than acid
Alkali chemical burns to eye
Saponification - denatures collage, thromboses vessels - household cleaners, fertilizers, and drain cleaners
Acid chemical burns to eye
Coagulation, H+ perecipitates protein - barrier. Industrial cleaners, batteries, vegetable preservatives
Initial treatment of chemical burns to eye
Immediate copious irrigation - topcial anesthesia (tetracaine), can use NS, LR, irrigate at least 30 min; angiocath or irrigating lens can be used; lids should be retracted and fornices swabbed for particulate matter; check pH with litmus paper after initial irrigation - (7.0-7.3). Once pH stabilized - cyclopegic agent (0.25% scopolamine), broad-spectrum antibiotic (cipro, ofloxacin, gentamicin, or robramycin should be applied). Refer to ophtho immediately w/o stopping irrigation.
Ruptured globe
Penetrating trauma leads to corneal or scleral disruption and extravasation of intraocular contents. Can lead to: irreversible visual loss and endophthalmitis
Endophthalmitis
Inflammation of the intraocular cavities
Signs and symptoms of ruptured globe
Pain, decreased vision; hyphema; loss of anterior chamber depth; “tear-drop” pupil which points toward laceration; severe subconjunctival hemorrhage completely encircling the cornea.
Diagnosis of ruptured globe
Seidel’s test, clinical exam
Management of ruptured globe
Stop exam. Cover with metal eye shield or cup. DO NOT PATCH. Consult ophthamology immediately. Do not perform tonometry. CT head and orbit to evaluate for concomitant facial/orbital injury. NPO. Tetanus. Antibiotics - cefazolin + Cipro provides gooc coverage. Antiemetics and analgesics decreases risk of Valsalva or movement which could increase IOP.
Etiology of central retinal artery occlusion
Emboli-cardiac,atherosclerotic, fat; vasculitis, coagulopathy, sickle cell
Signs and symptoms of central retinal artery occlusion
Sudden onset severe monocular vision loss over seconds; usually preceded by amaurosis fugax; 90% will have visual acquity of counting fingers or less; after visual activity, do IOP, pupillary response (APD common); dilate pupils immediately and perform fundoscopic exam
Cranial retinal artery occlusion (CRAO)
Narrow arterioles, optic disc and retinal pallor, cherry red spot at fovea (due to maintained perfusion of cilio-retinal artery), emboli seen 20%
Treatment of cranial retinal artery occlusion (CRAO)
Must have VERY high index of suspicion, especially in patients with appropriate risk factors. Immediate referral. Retina can become irreversibly damaged in 100 min. Mannitol 0.25-2 g/Kg IV or acetazolamide 500 mg PO once to reduce IOP. Carbogen inhalation (95% O2 and 5% CO2). Oral nitrates. Lay pt flat on back. Massage orbit. This is thought to help dislodge clot from a larger to smaller retinal artery branch, minimizing area of visual loss. Ophthalmologist may perform paracentesis of aqueous humor to reduce IOP.
Retrobulbar hematoma
Acute orbital compartment syndrome secondary to blunt or penetrating trauma. Hemorrhage into closed space of orbit. Increased IOP leading to vision loss from optic nerve damage/retinal ischemia
Clinical diagnosis of retrobulbar hematoma
Ocular pain, APD, proprosis, ophthalmophegia, diminished vision, increased IOP. Immediate lateral canthotomy and cantholysis indicated if IOP > 40 mmHg or vision loss
What to do if fish hook in the eye
Stabilize hook. Brief exam to document visual acuity, pupillary responses, visual fields. Protect eye from further damage. NPO. Tetanus. IV antibiotics. Pain control. Antiemetics. Refer.
Blepharitis
Inflammation of the eyelids. 2 categories anterior and posterior. As a result of oil secretions or solidification of meibum, a chalazion or hordeolum may develop.
Anterior blepharitis
Involves the anterior lid margin surrounding the lid margin and is usually associated with Staph infection or seborrhea.
Anterior staphylococcal blepharitis
A cell mediated response resulting in lid margin inflammation
Anterior seborrheic blepharitis
Often associated with generalized seborrhea
Posterior blepharitis
Caused by meibomian gland dysfunction and an alteration in meibomian gland secretions
History and clinical presentation of blepharitis
Burning, tearing, or foreign body sensation. Itching, redness, discharge. Absent lashes. Lashes crusted with meibum. Seborrheic blepharitis may have greasy scales along the lid margins with foamy tears, diffuse seborrhea or the scalp and ears. Rosacea is related to meibomian gland dysfunction. Patients may have erythema or telangiectasia over the cheeks and nose or pustular skin eruptions.
Management of blepharitis
Lid hygiene - warm, moist compresses for 5-10 minutes; lid scrubs with Q-tip and baby shampoo. Antibiotic ointment - E-mycin or bacitracin. Artificial tears. Referral to ophthalmologist for corticosteroids
Hordeolum
An acute infection of a gland in the eyelid. Inflammed area or eyelid where eyelashes meet eyelid. Bacteria (usually staph) gets into the oil gland that lubricates the eye. Similiar process to a pimple.
History and clinical presentation of hordeolum
Swollen single gradually emerging red bump on the eyelid, gritty scratchy sensation, sensitivity to light, tearing, tenderness on the eyelid.
Management of hordeolum
Usually self-limited. Spontaneous improvement in 1-2 weeks with conservative treatment. Frequent warm, moist compresses. Teaching light and gentle massage, lid hygiene with lid scrubs. Refer if I&D needed
Chalazia
Chronic, sterile lipogranulomatous inflammatory lesion of the meibomian gland.
Lipogranuloma
Caused by a blockage in the Meibomian gland or oil gland that lubricates the eye. A gradually localized enlarging nodule where glands are located near the eyelashes.
History and clinical presentation of chalazia
Hard, non-tender module found on the mid-portion of the eyelid away from the lid border. May develop on lid margin with lid tenderness, pain, and swelling. Eyelid tenderness, increased tearing. Gradually enlarging nodule on the eyelid, sensitivity to light, pain, or pressure if pressing against the cornea.
Management of chalazion
Usually self-limiting in 25-50% of cases. Spontaneous improvement in 1-3 months with conservative treatment. Frequent warm, moist compresses to liquify glandular secretions. Teaching: gentle massage to express impacted secretions. Referral for corticosteroid injections or I&D if necessary.
Viral conjunctivitis
Inflammation of the conjunctiva or the transparent mucosal tissue than lines the eye and inner surface of the eyelids. Generally caused by adenovirus. Highly contagious