Download - Diabetic retinopathy
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DIABETIC RETINOPATHY
Dr. Christina Samuel
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DEFINITION
• DIABETIC RETINOPATHY IS A PROGRESSIVE MICRO ANGIO PATHY WITH CONSEQUENT BREAK DOWN OF BLOOD RETINAL BARRIER RESULTING IN A VARIETY OF FUNDUS PICTURE FINALLY LEADING TO BLINDNESS
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DIABETIC RETINOPATHY
RISK FACTORS/PROGNOSTIC FACTOR
DURATION OF DM- type 1 4-5yrs no DR type 2 11-13yrs 23% NPDR 5-10yrs 25%-30% 3% PDR 10-15yrs 75%-95% 16yrs 60% NPDR 20-25yrs PDR in 18%-40• TYPE OF DM • AGE • BLOOD GLUCOSE LEVELS • HT • NEPHROPATHY • SERUM LIPIDS • ANEMIA• PUBERTY,PREGNANCY,BMI
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LOCAL PROTECTIVE FACTORS
• MYOPIA
• CHORIO RETINAL SCARRING
• GLAUCOMA
• OPTIC ATROPHY
• RP
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PATHOGENESIS• MICROANGIOPATHY AFFECTING PRE CAPILLARIES
ARTERIOLES,CAPILLARIES & VENULES.• FEATURES
MICROVASCULAR MICROVASCULAR OCCLUSION LEAKAGE RETINAL ISCHEMIA IRMA NV H’GES EDEMA EXUDATES hematological loss of pericytes vascular abn breakdown of BRB
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HEMATOLOGICALABNORMALITIESHEMATOLOGICALABNORMALITIES• ABNORMALITIES OF PLATELET ABNORMALITIES OF PLATELET FUNCTIONFUNCTION• DEFECTIVE FIBRINOLYTIC DEFECTIVE FIBRINOLYTIC SYSTEMSYSTEM• HYPERVISCOSITY AND ABNORMALHYPERVISCOSITY AND ABNORMAL RBC AGGREGATION RBC AGGREGATION • ABNORMAL SERUM LIPIDSABNORMAL SERUM LIPIDS
MICROVASCULAR ABNORMALITIESMICROVASCULAR ABNORMALITIES• BASEMENT MEMBRANE THICKENING BASEMENT MEMBRANE THICKENING • earliest changeearliest change increased BM proteinsincreased BM proteins• LOSS OF PERICYTES 1:1 ratio-normalLOSS OF PERICYTES 1:1 ratio-normal loss of BRBloss of BRB autoregulation autoregulation new vesselsnew vessels
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PATHOGENESIS
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•OTHER VASCULAR
ABNORMALITIES
–COAGULATION
–PERMEABILITY
–CONTRACTILITY & FLOW
–CELLULAR REGENERATION
Normally- TGF-B release by endo cells
inhibition of proliferation
In DR- loss of pericytes
prevents expression of TGF-B
endothelial cell proliferation
microaneurysms
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ANGIOGENIC FACTORS FGF,TGF-B,PDGF,IGF-1 & 2,VEGF• FGF-basic• IGF-1 &2• VEGF-produced by retina -induced by hypoxia -pro angiogenic -induces permeability -diffusible thru out eye
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PATHOLOGICAL LESIONS MICRO ANUERYSMS
• Signs-tiny, round dots
• site-inner nuclear layer. Venous end of capillaries
• size-12-100mic, >30 mic
• course-hyalinization, occlusion, months -yrs
• Importance-
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• RETINAL HEMORRHAGES Intra retinal “Dot –blot” Site-inner nuclear layer venous end of capillary
“flame shaped” site-NFL superficial pre-capill arterioles
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HARD EXUDATES• Signs-waxy, yellow with distinct margins • Site-outer plexiform layer• Composition-lipoproteins, lipid laden macrophages• Due to abnormal cap
& microanuerysms• Circinate pattern
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SOFT EXUDATES• cotton wool spots• signs-whitish, fluffy,obscure blood vessels• composition-axoplasmic stasis• course- in wks to mths• importance –focal infarcts
8 or more-PDR in 6-18mths
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IRMA• Shunts from arterioles to venules• close to areas of capillary closure• signs-fine red lines, focal areas of flat new vessels• distinguishing feature-intra retinal , do not cross major vessels, absence of leak RETINAL EDEMA• site-all layers• signs-retinal thickening, transparency lost cystoid appearance
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CAPILLARY ABNORMALITIES • occlusion –focal, perifoveal, regional• dilatation• microaneurysm• abnormal permeability ARTERIOLAR ABNORMALITIES• obstruction• sheathing VENOUS ABNORMALITIES• general dilatation• beading & sausaging• venous kinks & loops• reduplication• CRVO• BRVO
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DIABETIC MACULOPATHY
MACULAR EDEMA- S/L examination ( Bimicroscopy), Absence of foveal reflex Cystoid appearance
TYPES Focal Diffuse Ischemic Mixed Detachment of macula
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Diabetic maculopathy FOCAL- well circumscribed retinal thickening
Rings of perifoveal exudates
around discrete foci of capillary abnormalities
DIFFUSE- thru out post pole
diffuse capillary abn.
ISCHEMIC-VA decreased but normal appearance
CWS +
focal cap drop outs
enlargement of FAZ
occl. of art in the macula
MIXED
MACULAR DETACHMENT
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ABBREVIATIONS
• CWS-COTTON WOOL SPOTS
• VA-VISUAL ACUITY
• FAZ-FOVEAL AVASCULAR ZONE
• MA-MICRO ANEURYSM
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MODERN ETDRS CLASSIFICATIONNPDR ( Non-Proliferative Diab Retinopathy)• MILD- at least 1 micro aneurysms Hard exudates Intra retinal h’ges Macular edema FAZ abnormalities
• MODERATE-Venous beading CWS IRMA Intraretinal h’ges
• SEVERE- Intraretinal h’ges in 4 quadrants Venous beading in 2 quadrants IRMA in 1 quadrant
• VERY SEVERE- Any 2 of the above
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MILD NPDR:
•ATLEAST ONE Ma /HGE
ANY QUADRANT
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MODERATE NPDR:
MODERATE AMT OF Ma/HGES
WITH HARD /SOFT EXUDATES
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SEVERE NPDR:
ATLEAST ONE OF THE FOLLOWING—
• HGES/Ma --- ALL 4 QUADRANTS
• VENOUS BEADING IN TWO
QUADRANTS• INTRA RETINAL MICROVASCULAR
ABNORMALITIES- ONE QUADRANT
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VERY SEVERE NPDR:
TWO OF THE ABOVE CRITERIA
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PROLIFERATIVE Diab Retinopathyhy-PDR
• EARLY-
NVD ( neovascularisation of the disc)
NVE ( neovascularisation elsewhere)
Vitreous/Preretinal h’ge &NVE >1/2DD
• HIGH RISK PDR-
NVD >1/4-1/3 DD
NVD & vitreous/preretinal h’ge
NVE>1/2DD & vitreous/preretinal h’ge
• ADVANCED PDR –
Tractional RD inv macula
Vitreous h’ge obscuring grade
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PROLIFERATIVE DR:
NEW VESSELS ON THE DISC ( NVD )
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NEW VESSELS ELSEWHERE ( NVE ):
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ADVANCED PROLIFERATIVE
DR
FIBROVASCULAR BANDS
PRE RETINAL HGE
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CLINICALLY SIGNIFICANT MACULAR EDEMA
THREE CRITERIA:criteria 1
• RETINAL THICKENING WITHIN 500 MICRONS
FROM THE FOVEA
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CLINICALLY SIGNIFICANT MACULAR EDEMA
criteria-2HARD EXUDATES
WITHIN 500 MICRONS
OF FOVEA WITH
ADJACENT RETINAL
THICKENING
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CLINICALLY SIGNIFICANT MACULAR EDEMA
Criteria-3
•RETINAL THICKENING
OF > 1 D.D. EVEN IF PARTLY
WITHIN 500 MICRONS OF FOVEA
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