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IP 11 Ophthalmology > 8: the uvea - pearce > Flashcards

8: the uvea - pearce Flashcards

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1
Q

which vascular tunic is the uveal tract?

A

middle vascular tunic

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2
Q

what are the components of the anterior uveal tract?

A

iris

ciliary body

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3
Q

what are components of the ciliary body?

A

anterior: pars plicata
posterior: pars plana

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4
Q

what is the fxn of the pars plicata?

A

aqueous production

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5
Q

what makes up the posterior uveal tract?

A

choroid

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6
Q

where is the choroid loc?

A

behind the retina

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7
Q

what is the significance of the uveal tract being an “immuno sensitive” organ?

A

it tells us a story - manifestation of 1* ocular dz OR is an ocular manifestation / sentinal for systemic dz

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8
Q

what is the importance of the choroid in terms of pharmacokinetics of drugs in the eye?

A

topical medication cannot reach the back of the eye d/t the choroid

NEED systemic meds to reach the back of the eye

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9
Q

what is heterochromia iridis?

etiology?

A

congenital condition

multiple colors occurring w/in one iris

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10
Q

what is heterochromic iridium?

etiology?

A

congenital condition

multiple colors occurring btwn 2 eyes

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11
Q

t/f

in cases of heterochromia iridis, the posterior uveal tract, in addition to the anterior uveal tract, is affected

A

true

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12
Q

what part of the posterior uveal tract is impacted in cases of heterochromia iridis?

A

choroid has less or no pigment - so less or absent tapetum

why the red eye reflection occurs in blue eyes

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13
Q

what is the normal appearance of the reflection of the eye?

how is it different in humans, animals with blue eyes and in cases of heterochromia iridis?

A

normal: green/yellow reflection is the tapetum w/in the choriod
abnormal: red eye reflection b/c non pigmented choroid / lack of pigment / tapetum

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14
Q

what is an iris coloboma?

etiology?

A

congenital conditions

absence / defect of iris tissue

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15
Q

which location does an iris coloboma MC occur?

why?

A

in the “6 o’clock” position

b/c there is an incomplete closure of the embryonic fissure in this location

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16
Q

what are persistent pupillary membranes (PPMs) ?

A

incomplete resorption of iridal embryonal vasculature and mesenchymal tissues

normal: the sheet of mesenchyme in the pupil atrophies in the embryo

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17
Q

what is the result of persistent pupillary membranes?

what is seen in the eye?

A

strands of tissue seen in the eye - originate at the iris collarette [in the middle of the iris]

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18
Q

in persistent pupillary membranes, what are 3 locations the strands can go to?

what is the manifestation of each?

A

iris to iris [more benign]

iris to cornea [corneal opacity]

iris to lens [cataract]

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19
Q

how does synechia differ from persistent pupillary membranes?

A

synechia is adherence of tissue
vs
PPMs are strands

PPMs originate from iris collarette - synechia does not

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20
Q

what is pupil dyscoria?

A

abnormally shaped pupil

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21
Q

what is pupil corectopia?

A

abnormal location of pupil

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22
Q

what is anterior segment dysgenesis also referred to? [why?]

what conditions typically occur with this condition?

A

merle ocular dysgenesis - common with accidental Merle to Merle breeding

  • iris colobomas
  • corectopia
  • PPMs
  • others also
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23
Q

what is anterior segment dysgenesis?

A

lens does not sepaarate properly from corneal tissue

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24
Q

what is iris atrophy?

A

spontaneous progressive thinning of the stroma or pupillary portion of the iris (or both)

common finding in middle-aged and older dogs

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25
why might iris atrophy lead to light sensitivity?
- thin area allows light through instead of through the pupil - and/or dec constriction ability of the pupil
26
2 common degenerative uveal changes?
- cyst | - melanoma
27
how to differentiate a cyst from a melanoma?
melanoma does NOT transilluminate - neoplasia will not let light though cysts DO transilluminate
28
what are 2 forms of 1* uveal neoplasia?
- melanocytic iridal neoplasia [melanoma / melanocytoma] | - ciliary body adenoma / adenocarcinoma
29
what is MC 1* uveal neoplasia? which species (dog or cat) has the worst prognosis?
melanocytic iridal neoplasia [melanoma / melanocytoma] cat worse prognosis overall - less than 10% malignant typically
30
what is the 2nd MC 1* uveal neoplasia? prognosis?
ciliary body adenima / adenocarcionma - pigmented or non pigmented 50/50 benign / malignant
31
what is MC 2* uveal neoplasia?
lymphosarcoma
32
c/s of 2* uveal neoplasia d/t LSA? what ocular structures are typically affected? what % of dogs and cats show ocular signs?
- uveitis - 40% of dogs show ocular signs - 50% of cats show ocular signs - iris and ciliary body usually affected
33
what are less common causes of 2* uveal neoplasia?
TVT HSA malignant melanoma carcinomas (renal, panc, thyroid)
34
what are 3 ways uveal tumors are treated?
- locally - Sx excision, diode laser for focal lesions - enucleation - chemotherapy [systematic or metastatic dz]
35
in what cases would enucleation be considered to Tx uveal tumor?
- extensive 1* tumors | - inflamed or glaucomatous eyes
36
what are some benefits to using laser Tx for uveal tumors?
- less invasive Tx option - does NOT damage the cornea => only affects damaged tissue - good for focal lesions and/or in early stages
37
what is aqueous flare? what condition is it pathogneumonic for?
tyndall effect of haziness in the posterior chamber d/t presence of particulates suspended in the fluid and illuminated by light anterior uveitis => inflammation leading to inc permeability of ocular vessels [impaired blood/ocular barriers] -> protein leaks out, into the posterior chamber
38
c/s of anterior uveitis?
``` ciliary flush corneal edema dec IOP dec vision hyphema hypopyon / fibrin iris color change iris swelling keratic percipitates mioosis pain conjunctival hyperemia ```
39
what is ciliary flush?
360* corneal vascularization ("hedge" appearance) that is present with deep intra ocular dz, uveitis, glaucoma, deep corneal dz
40
why is corneal edema seen with anterior uveitis?
hazy cobblestone appearance of cornea b/c endothelial cells are not able to pump fluid out of the cornea like they should do, b/c of the inflammation
41
why does dec IOP occur w anterior uveitis?
toxic things floating around in the eye affects its ability to produce fluid - b/c the non pigmented epithelium of the ciliary body does not perform well dec fluid production -> dec IOP
42
what is hypopyon?
pus in the eye
43
what color changes occur to the iris during anterior uveitis? under what circumstances?
darker -> brown to dark brown / black OR blue to yellow rubeosis iridis chronic uveitis
44
what is reubeosis iridis and what does it mean?
blood vessels grow on the iris surface pathogneumonic for uveitis
45
what do keratic precipitates look like?
a greasy appearance => granulomatous inflammation
46
why does miosis occur with anterior uveitis?
inflammation with PGs - stimulates PG receptors of the iris - miosis occurs also - spasm of iris sphincter M occurs
47
what are c/s of posterior uveitis?
- tapetal hyporeflectivity - granulomas - retina: edema, detachment, hemorrhage - vitreous opacity
48
what part of the uveal tract does posterior uveitis occur in?
choroid
49
what is common sequelae of uveitis?
cataract synechia iris atrophy
50
what is synechia?
adherence of iris to lens tissue posterior: can stick to lens anterior: can stick to cornea
51
what are common sequelae to uveitis?
lens luxation - d/t zonular break down phthisis bulbi - d/t chronic lack of fluid produciton iris bombe - 360* adherence of pupil martin -> fluid pushes iris fwd and pupil stays on loc of lens b/c it is stuck there 2* glaucoma
52
what is endophthalmitis?
inflammation of intra ocular contents NOT cornea and sclera
53
what is panophthalmitis?
inflammation of all ocular structures ==> including orbital fissure includes fibrous tuinc (cornea and sclera)
54
the first thing to do when approaching a uveitis patient is to make an etiologic diagnosis. over ____% of cases are idiopathic.
50
55
common infectious causes of canine uveitis?
``` viral - distemper, CAV-1 tick born - RMSF, ehrlichia fungal bacT - brucella, lyme parasitic - dirofilaira algal - protheca protozoal - toxo, neospora ```
56
common causes of feline uveitis?
4 Fs and 1 T: ``` FeLV FIV VIP Fungal Toxoplasma ``` maybe Bartonella
57
classifications of non infectious uveitis?
metabolic immune mediated trauma lens associated
58
what are metabolic causes of uveitis?
hyper lipidemia -> aqueous fills up with lipid -> eye looks very milky diabetic - cataract related / lens induced uveitis
59
common immune mediated cause of uveitis?
uveodermatologic syndrome targets pigmented cells - many loc w/in uveal tract
60
2 types of lens associated uveitis?
phacolytic - protrusion across intact lens capsule | phacyclastic - lens capsule rupture
61
2 types of traumatic causes of uveitis?
blunt or piercing | ulcerative keratitis
62
Dx of uveitis?
``` complete PE blood work (cbc, chem) urinalysis chest x rays abdominal x rays lnn aspirates abdominal u/s infectious dz testing ```
63
after etiologic dx of uveitis is made, what next?
control inflammation px undesirable sequelae relieve pain
64
Tx of uveitis?
Tx 1* cause, if an etiologic cause is made specific abx, chemotherapy, remove lens / foreign material, Tx of ulcerative keratitis
65
presumptive tx of uveitis in cats:
clindamycin (anti-toxoplasma) anti fungal
66
presumptive tx of uveitis in dogs:
doxycycline (anti rickettsial) anti fungal
67
drugs to control inflammation in Tx of uveitis? 3 classes and some examples in each
corticosteroids - topical, systemic, sub conjunctival NSAIDs - topical, systemic immuno suppressive agents - cyclosporine, azathioprine
68
what 2 classes of drugs should NOT be used together in the Tx of uveitis?
systemic NSAIDs and steroids
69
contra indications to corticosteroid use?
ulcerative keratitis - NO topicals deep mycotic dz - NO systemics
70
concerns with topical corticosteroid use?
2* infections inhibits wound healing systemic absorption
71
concerns with systemic corticosteroid use?
immunosuppression | adrenocortical suppression
72
t/f the best treatment for an ulcer is topical steroids
false never give topical steroids if an ulcer
73
what is solubility of a corticosteroid? potency?
solubility: acetate and alcohol forms more lipid soluble than phosphate forms; relates to penetration of the drug into a tissue potency: the extend of the anti-inflammatory effect, irrespective of penetration
74
high lipid solubility of a steroid means better penetration into which tissue layer?
corneal epithelium
75
the addition of what to a molecule enhances the anti inflammatory activity? i.e. improves potency
fluoride and methyl molecules
76
t/f a more potent corticosteroid is just as good as a more soluble steroid, if given at higher doses
false a more potent drug will do NO good if it cannot penetrate the target tissue
77
what corticosteroids are very lipid soluble, therefore penetrate tissues well? this is effective in the Tx of what?
prednisolone acetate anterior uveitis
78
common NSAIDs used to treat uveitis? for what type of uveitis are systemic NSAIDs necessary?
carprofen meloxican necessary for posterior uveitis
79
t/f topical NSAIDs are often used along with topical steroids
true
80
what are two examples of commonly used topical NSAIDs?
didofenac sodium | flurbiprofen sodium
81
what is the 1* indication for topical NDAID use in uveitis?
anterior uveitis
82
concerns of the use of NSAIDs in Tx of uveitis?
hyphema | glaucoma
83
indications for systemic NDAIDs?
- adjunct to topical Tx of anterior uveitis | - ocular discomfort
84
concerns with systemic NSAIDs in tx of uveitis?
dry eye (KCS) renal GI hematologic
85
what drugs are used in the Tx of uveitis to Px undesirable sequelae?
- anti glaucoma drugs | - mydriatics / cycloplegics
86
2 classes of mydriatics / cycloplegics used in Tx of uveitis? functions? contraindications?
- anti cholinergics [atropine, tropicamide] - adrenergics [phenylephrine hydrochloride] - eliminates ciliary spasm / pain - dilates pupil and Px synechia - stabilizes blood aqueous barrier - contraindicated in glaucoma or if tear deficiency
87
what medications can be used to relieve pain in the Tx of uveitis?
- mydriatics/cycloplegics - anti-inflammatory agents - dark environment - stall or eye mask - eliminates photophobia - analgesics if needed: butorphanol, morphine, tramadol, oxymorphone, hydromorphone

IP 11 Ophthalmology (13 decks)

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