Lecture 6 POAG Flashcards
(T/F) Secondary open angle glaucoma is more aggressive than primary open angle glaucoma
true
Your pt had a c/d ratio in the OD of 0.90 and the c/d ratio in OS is 0.70. Is this significant enough to call it asymmetric?
yes. a 0.20 or more difference is considered asymmetric.
Which one of the following is NOT associated with POAG?
a) IOP is often over 21 mmHg
b) POAG is an idiopathic condition
c) POAG is chronic, bilateral, and often asymmetric
d) POAG has a higher rate of prevalence and incidence among chinese
d) POAG has a higher rate of prevalence and incidence among chinese. (false, it is highest among african americans)
Which of the following is NOT a goal regarding treatment of POAG?
a) document status of nerve structure and function
b) develop a target pressure and maintain IOP below that target pressure
c) minimize side effects by giving the least amount of drug necessary to stop progression and if you see progression, reset target pressure.
d) educate and engage pt in POAG management to enhance compliance.
e) all of the above are POAG treatment goals
e) all of the above are POAG treatment goals
Which one of the following is not a risk factor of POAG?
a) age, race, family history
b) IOP, optic nerve, vascular disease
c) peripheral corneal thickness
d) myopia
e) low diastolic perfusion pressure
c) peripheral corneal thickness (false, central corneal thickness)
(T/F) Only 10% of OHT (ocular hypertension) pts develop glaucoma in 5 years.
true. and in 10 years, 15-40% of OHT pts develop glaucoma
(T/F) Only 1/10th of pts with elevated IOP have vision loss
true
(T/F) Only 1/6th pts with disc and field damage have IOP less than 21mmHg
true
(T/F) Lowering IOP is really the only parameter we have the ability to change for glaucoma pts.
true and the more the IOP is reduced, the more likely it is that progression of glaucomatous optic nerve damage will be retarded.
How many times greater is the risk of POAG for african americans compared with caucasians?
a) 2x
b) 4x
c) 6x
d) 8x
b) 4x
Blindness due to glaucoma is how many times greater in an african american when compared to a caucasian?
a) 2x
b) 4x
c) 6x
d) 8x
d) 8x
(T/F) Measuring IOP is a poor screening method for POAG because most people with high pressures do not have or never develop POAG
true (sensitivity 47.1%, specificity 92.4%)
Which of the following statement is NOT true regarding POAG screening?
a) screening can be made more efficient by including ONH and RNFL assessment
b) screening can be more efficient if targeted to specific groups: older population, African Americans, and relatives of glaucoma pts.
c) frequency doubling technology shows promise as a screening tool.
d) standard visual field is quick and easy
d) standard visual field is quick and easy (false, it is time consuming)
What is the target pressure calculation?
target pressure=max IOP-max IOP%-Z
*max IOP% can be approx. 20 or 30% of max IOP value, can be 40% or more for severe glaucoma
Z=optic nerve damage
0=normal disc and visual field
1=abnormal disc and normal visual field
2=visual field loss not threatening fixation
3=visual field loss threatening or involving fixation
You have a max IOP of 30 mmHg and a Z score of 1, what is the target IOP?
30% of 30 is 10 so 30-10-1=19…..19 is the target pressure. You know 20% would not work since IOP would still be above 21 (target pressure=max IOP-max IOP%-Z)
*max IOP can be 20% or 30% of max IOP value or 40% for more severe glaucoma.