WCS32 Ocular Manifestations Of Systemic Disease Flashcards
Systems related to eyes
- Endocrinology
- Rheumatology
- CVS disease
- Skin and Paediatric conditions
- Drug-related
Diabetes Mellitus and Eyes
- Diabetic retinopathy
- **Non-proliferative (NPDR) (Earlier stage)
- **Proliferative (PDR) (Later stage)
—> may NOT affect central vision - Diabetic maculopathy
—> affect central vision
Symptoms of Diabetic retinopathy
記: MCV, HDI
- ***Microaneurysm
- Hallmark of diabetic retinopathy
- Earliest sign - Retinal haemorrhage (***Dot-and-blot, flame-shaped)
- usually visually insignificant - ***Hard exudates
- accumulation of lipoproteins leaked from vessels - ***Cotton wool spots
- focal areas of infarction of retinal nerve fibre - ***Venous beading
- increasing ischaemia - Intra-retinal microvascular abnormalities (IRMA)
- anastomosis between arterioles and venules
- vs Neurovascularisation (network-like) (IRMA: much smaller)
***Pathophysiology of Diabetic retinopathy
Retinal microangiopathy (e.g. Microaneurysm, Retinal haemorrhage) —>
- ***Breakdown of Blood-Retinal Barrier —> Macula edema
- Hard exudates - ***Retinal ischaemia —> Vasoproliferative substances (e.g. VEGF) (Neovascularistion) —> Macula edema
- Cotton wool spots
- Venous beading
- IRMA
***Non-proliferative Diabetic Retinopathy (NPDR)
Mild:
- ***>= 1 Microaneurysm
Moderate:
- ***Multiple microaneurysm
- Dot-and-blot haemorrhages
- Venous beading
- +/- Cotton wool spots
Severe (***4-2-1 rule):
- Diffuse haemorrhage + Microaneurysms in ***4 Quadrants
- Venous beading in 2Q
- IRMA in >=1Q
- > 50% progress to PDR
***Proliferative Diabetic Retinopathy (PDR)
- ***Retinal neovascularisation
- ***Vitreous haemorrhage
- Pre-retinal fibrosis (***regression of neovascularisation)
- Rubeosis iridis (NVI)
- impending Neovascular glaucoma
***Diabetic maculopathy
Symptoms
- Multiple exudate / cystic space
- Dull macula
- Macular edema —> Loss of depression at fovea
- Loss of central vision
Pathophysiology:
1. Breakdown of Blood-retinal barrier
2. Vasoproliferative substances (VEGF)
Both —> Macula edema
Complications of Diabetic retinopathy / maculopathy
- ***Cataract (usually cortical)
- ***Neovascular glaucoma (newly formed blood vessels —> fibrosis —> closes the angle)
- ***Tractional retinal detachment
Treatment of Diabetic Retinopathy / Maculopathy
Mild / Moderate NPDR
- ***Glycaemic control (diet, medication)
Severe NPDR / PDR
- ***Panretinal laser photocoagulation (PRP)
—> killing of retinal tissue to prevent progression + preserve macula
—> impair peripheral vision + night vision
Clinically significant macula edema (CSME)
- Intravitreal ***anti-VEGF (Ranibizumab / Aflibercept)
- Intravitreal ***steroid (Triamcinolone / Ozurdex)
- ***Focal / grid laser if no macula ischaemia —> obliterate leaking microaneurysm + stimulate retinal pigmented epithelium to absorb more water in cystic space
Thyroid eye disease (TED) / Graves’ ophthalmopathy / Orbitopathy (GO)
- Typically associated with Graves’ hyperthyroidism
- Also occur with hypothyroidism / euthyroid individuals
- Immune-mediated
Orbital signs:
- ***Exophthalmos / Proptosis
- ***Limited EOM / Squint
Eyelid / Ocular signs:
- Lid retraction
- Lid lag
- Lagophthalmos (incomplete closure of the eyelids)
- Lid puffiness / Erythema
- Conjunctival injection / Caruncle inflammation / Chemosis (conjunctival swelling)
Ocular complications in TED
- ***Compressive optic neuropathy
- ***Exposure keratopathy —> cannot close eyes
- Increased IOP / Glaucoma
CT Orbit in TED
- ***Tendon sparing muscle enlargement (Pathognomonic for TED)
- Look for ***apical crowding (Compression of the optic nerve at the apex of the orbit by enlarged extraocular muscles —> looking for complication)
Phases in TED
- Active phase:
- Inflammatory (6-18 months) - Quiescence phase:
- Post-inflammatory
***Activity and Severity of TED
Activity: Clinical Activity Score (CAS) Active: CAS >=3 1. Spontaneous retrobulbar pain 2. Pain on eye movements 3. Eyelid erythema 4. Conjunctival injection 5. Chemosis 6. Swelling of the caruncle 7. Eyelid edema / fullness
Severity (**Exophthalmos, **Lid retraction):
- Mild
- minor lid retraction (<3mm)
- transient / no diplopia
- corneal exposure responsive to lubricants - Moderate to Severe
- lid retraction (>=2mm)
- moderate / severe soft tissue involvement
- exophthalmos >=3mm above normal for race + gender
- inconstant / constant diplopia - Sight threatening
- Dysthyroid optic neuropathy (DON)
- Corneal breakdown (Exposure keratopathy)
Management of TED
Mild:
- ***Quit smoking
- Normalise thyroid function
- Symptomatic treatment (e.g. lubricants for dry eyes)
Moderate to Severe:
- Active —> Immunosuppression with ***Steroid (weekly IV infusion Methylprednisolone 12 weeks)
- Inactive —> Surgeries (***Orbital —> Squint —> Lid)
Sight-threatening:
- Immediate intervention needed
—> DON: IV steroid + **Orbital decompression (thinning of **medial wall + **floor (X Lateral wall + Superior roof))
—> **Exposure keratopathy: Meds + Tape +/- Decompression
Teprotumumab
Anti-IGF1 Ab
- Insulin-like growth factor 1 receptor
- Rapidly effective in decreasing disease activity
Rheumatology and Eyes
Collagen + Vessels
Autoimmune diseases with ophthalmic manifestations
- Seronegative spondyloarthropathies (***HLA-B27, ANA and RF -ve)
- Ankylosing spondylitis
- IBD-associated - RA
- SLE
- Sjögren’s syndrome
- Sarcoidosis
Ocular manifestations of Rheumatology disease
- ***Uveitis
- ***Peripheral Ulcerative Keratitis (PUK)
- ***Keratoconjunctivitis sicca (Sjögren’s)
- ***Episcleritis / Scleritis
- Retinal vein occlusion
- ***Ischaemic optic neuropathy
Anterior uveitis vs Panuveitis
Anterior uveitis:
- Mostly commonly isolated + idiopathic
- Commonest association is **Seronegative spondyloarthropathies
—> esp. with **HLA-B27 allele
—> Ankylosing spondylitis, Psoriatic arthritis, IBD associated, JIA
- Others: RA, SLE, Sarcoidosis
Panuveitis:
- Anterior uveitis + ***Posterior segment inflammation (Chorioretinitis, Vitritis, Retinal vasculitis)
- Much less common
- Usually associated with ***Behcet disease
Signs of Anterior Uveitis
- Ciliary flush
- Keratic precipitates (KP) —> inflammatory cellular deposit seen on corneal endothelium
- Anterior chamber cells
- Posterior synechiae (PS) —> Iris stick on the lens
- Hypopyon —> Exudate (death inflammatory cells) in lower part of eyes
Uveitis treatment
Anterior uveitis:
- ***Topical steroid
- intensive initially then taper gradually - ***Topical cycloplegics (e.g. homatropine, atropine)
- relieve pain due to ciliary spasm
- prevent posterior synechiae - If steroid resistant / dependent
- AC tapping to rule out infection (HSV, VZV, CMV, TB)
- Subtenon steroid for unilateral disease (Triamcinolone)
Panuveitis / Posterior uveitis
1. Treat underlying condition
- ***Systemic steroid +/- immunomodulator
- ***Intravitreal steroid (Triamcinolone, Ozurdex)
- more for unilateral cases - Biologics: ***TNF inhibitors (Infliximab, Adalimumab)
Peripheral Ulcerative Keratitis (PUK)
Signs
- Crescent shape ulcer
- Active ulcer on peripheral scar
- Corneal thinning
- Perforation
- Mainly associated with ***RA
—> others: collagen vascular disease (SLE), IBD - Mooren’s ulcer if isolated
Treatment:
- Systemic (Inflammation control)
- Systemic steroid (Prednisolone +/- IV Methylprednisolone)
- Immunomodulators (MTX, Azathioprine, Cyclosporin A, Cyclophosphamide)
- Biologics (Infliximab, Rituximab) - Local (Damage control)
- Preservative free lubricants
- Topical antibiotics
- Conjunctival recession - Prevent perforation
- protect with eye shield
- corneal melting —> avoid topical steroid - Small / impending perforation
- Cyanoacrylate glue + Bandage contact lens (BCL) - Larger perforation
- Corneal patch graft
CVS disease and Eyes
Hypertensive retinopathy
Grade 1: Barely detectable arterial narrowing
Grade 2: Obvious **arterial narrowing with focal irregularities
Grade 3: Grade 2 + **Retinal haemorrhage + Exudates + CWS + Retinal edema
Grade 4: Grade 3 + ***Papilloedema
Skin + Paediatric conditions and Eyes
Herpes Zoster Ophthalmicus
- reactivation of latent VZV in Trigeminal ganglia (V1, V2)
- ***Hutchinson’s sign (Nasociliary nerve affected —> more likely to have Intraocular inflammation)
Ocular involvements:
- Conjunctivitis
- ***Keratitis (Microdendritic lesions) (Simplex virus: Large dendritic lesions)
- ***Anterior uveitis
- Episcleritis
- Scleritis
- Trabeculitis (↑ IOP)
- Retinitis
- Retinal vasculitis
- Choroiditis
- Optic neuritis
Management and Sequelae of Herpes Zoster Ophthalmicus
Management:
- Airborne precaution until lesions crusted
- Oral ***Aciclovir 800mg 5x/day for 7-10 days
- +/- Ointment Aciclovir 5x/day
- Treatment for ocular complications
Potential sequalae:
- Post-herpetic neuralgia
- Skin scarring
- Sequalae of ocular complications
Marfan syndrome
- Autosomal dominant trait
- Defective ***FBN1 gene at chromosome 15
—> Encoding fibrillin-1 - **Ectopia lentis (Lens subluxation / dislocation)
- Idiopathic
- Ocular causes: trauma, pseudoexfoliation syndrome
- Systemic causes: Marfan syndrome (most common, superotemporal subluxation), Homocystinuria (2nd most common, inferonasal subluxation)
Neurocutaneous Syndrome (aka Phakomatoses)
- Sturge-Weber syndrome
2. Neurofibromatosis Type 1
- Sturge-Weber syndrome
Vascular malformation involving Leptomeninges + Facial skin
Neuro: ***Leptomeningeal angioma
- Developmental delay / Intellectual disability
- Seizures / Epilepsy
Cutaneous: ***Port-wine stain
- aka Nevus flammeus
- Typically V1, V2 distribution
Ophthalmic problems:
- Glaucoma
- Diffuse choroidal hemangioma
- Neurofibromatosis Type 1
- aka ***Von Recklinghausen’s Disease
- AD inheritance with high penetrance
- Mutation / Deletion of ***NF1 gene at chromosome 7q
—> encode neurofibromin
Diagnostic criteria:
- ***Plexiform neurofibroma
- ***Optic glioma
- > =1 Lisch nodules
- ***Sphenoid dysplasia (pulsatile proptosis)
Drug-related ophthalmic conditions
- Bull’s eye maculopathy
- ***Chloroquine»_space; Hydroxychloroquine
- Risk correlates to daily dose, duration of use and total accumulative dose
- Other risk factors: Age, liver, renal impairment, obesity - Vortex keratopathy
- aka Cornea verticillata
- Whorl-like pattern of golden brown / gray deposits in the inferior
- ***Amiodarone
- Other drugs: Chloroquine / Hydroxychloroquine, Indomethacin, Phenothiazine - Eyelid hypertrichosis and Trichomegaly
- Systemic medication: Eriotinib —> Prominent Trichomegaly with curling of lashes
- Topical medication: Prostaglandin analogs (Bimatoprost, Latanoprost) —> Hypertrichosis > Trichomegaly, much less lashes curling
- Hirsutism: Cyclosporine, Tacrolimus, Phenytoin, Interferon-α2b
***Systemic steroid + Topical steroid
Systemic steroid:
- Central Serous Chorioretinopathy (CSC)
- Cataract (Posterior subcapsular)
Topical steroid:
- Partial ptosis
- mild ptosis
- Muller muscle atrophy - Increased IOP / Glaucoma
- also in systemic steroid use - Cataract
- Posterior subcapsular type
- fast visual deterioration
***Important points
- DM: Retinopathy vs Maculopathy
- Thyroid eye disease: Activity vs Severity
- Herpes Zoster Ophthalmicus
- Uveitis and associated autoimmune disease
- Steroid side effects