wk7: Fusion Group 2-4 Flashcards
Define Hypertension
blood pressure >/= 140/90mmHg
List 3 ocular complications of hypertension
choroidopathy
retinopathy
optic neuropathy
Name the 3 phases of Hypertensive Retinopathy
- vasoconstictive
- sclerotic
- exudative
What occurs in vasoconstrictive phase of hypertensive retinopathy? (2)
Acute rise in B.P
Arteriolar narrowing (A/V ratio around 1/3rd)
What occurs in sclerotic phase of hypertensive retinopathy? (4)
chronic HTN
pronounced arteriolar narrowing
av crossing
copper wiring
What occurs in exudative phase of hypertensive retinopathy (3)
persistent uncontrolled HTN
BRB disrupted
retinal haemorrhage
What percentage of diabetics are type 2?
90%
What proportion of type 1 diabetics are affected by diabetic retinopathy in some way within the first 2 decades of diabetes?
Almost all
What proportion of type 2 diabetics are affected by diabetic retinopathy within the first 2 decades of diabetes?
Over 60% affected
Describe the clinical characteristics/mechanism of Diabetic retinopathy (5)
(Earliest changes =) Reduced retinal perfusion
Weakening of retinal blood vessels
Nerve fibre swelling
Adverse metabolic reactions degrade retinal endothelial cells
Ultimately retinal ischaemia
Define non-proliferative DR
microaneurysms form in the blood vesselsof the eye, which can burst to leak blood
Define proliferative retinopathy
new blood vessels and scar tissue form on the retina causing loss of vision
Can non proliferative diabetic retinopathy lead to diabetic macular oedema?
yes
What happens in diabetic macular oedema?
vascular leakage and accumulation of plasma constituents in the macula
Does fish oil help treat diabetes?
No effect on prevention and treatment of type 2 diabetes
Types of primary glaucoma? (2)
Angle closure
Primary open angle
How can you classify angle closure glaucoma? (2)
acute or chronic
Name 3 different secondary glaucomas
traumatic glaucoma
neovascular (rueotic) glaucoma
pigmentary glaucoma
Describe the mechanism behind angle closure glaucoma (4)
Drainage angle obstructed –> increased IOP –> ONH damage –> VF loss
What IOP is considered an emergency?
over 30mmHg
Why does primary angle closure glaucoma occur?
due to pupillary block
Why does secondary angle closure glaucoma occur?
due to another identifiable pathology (e.g. neovascularisation)
List the symptoms of acute angle closure glaucoma (7)
rapid IOP elevation
sudden onset of pain
headache
nausea
vomiting
transient vision loss
halos
Can chronic angle closure glaucoma be asymptomatic?
yes
What IOP might you expect to see in angle closure glaucoma?
40-80mmHg
List 5 characteristics of POAG
Often bilateral but asymmetric
Open anterior chamber angle
IOP often mildly elevated (over 21mmHg)
Drainage system clogged or dysfunctional
Typical aysmptomatic until advanced signs