What is the mechanism of action of osmotic agents when used to decrease IOP?
Decreasing viscosity of the tears and allowing fluid to drain away from the eye
Increasing plasma osmolarity and drawing extracellular fluid into the blood
Blocking production of aqueous humor
Promoting outflow of the aqueous humor into the tear ducts
The Correct Answer is B
a) Decreasing viscosity of the tears and allowing fluid to drain away from the eye: This is incorrect. Osmotic agents do not act by affecting the viscosity of tears or enhancing drainage.
b) Increasing plasma osmolarity and drawing extracellular fluid into the blood: Osmotic agents, like mannitol, work by increasing plasma osmolarity, which draws excess fluid from the eye into the bloodstream, thereby lowering intraocular pressure.
c) Blocking production of aqueous humor: This is incorrect. Blocking production of aqueous humor is the mechanism of action of medications like beta-blockers (e.g., timolol), not osmotic agents.
d) Promoting outflow of the aqueous humor into the tear ducts: This is incorrect. Promoting outflow of aqueous humor is the mechanism of action for other medications, such as prostaglandin analogs, not osmotic agents.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["50"]
Explanation
Drip rate (gtt/min)=Volume to be infused ÷ Time
= (100ml ÷ 60 min )× 30 gtt/ml
= 50 gtt/min
Correct Answer is B
Explanation
a) Increase sodium in the diet: A low-sodium diet is often recommended for clients with Meniere's disease to reduce fluid retention and decrease the severity of symptoms.
b) Avoid sudden head movements: Sudden head movements can exacerbate vertigo, so the client should avoid them to help control symptoms.
c) Increase fluid intake to 3000 mL a day: Excessive fluid intake can worsen symptoms in Meniere’s disease by increasing fluid retention in the inner ear.
d) Lie still and watch television: This is not an effective strategy for controlling vertigo. It is more beneficial for the client to rest in a quiet, dark environment to reduce vertigo episodes.
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