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 A
Explanation
a) "I should call the clinic before taking any over-the-counter medications.": Over-the-counter medications, especially decongestants and antihistamines, can increase intraocular pressure and should be used with caution in glaucoma patients.
b) "Every two years I will need to have my vision checked by an eye doctor.": This is incorrect because glaucoma patients need more frequent eye exams, typically every 6 to 12 months.
c) "If I forget to take my eye drops, I should wait until the next time they are due.": The client should take the missed dose as soon as remembered, unless it is close to the next scheduled dose. Waiting could result in elevated intraocular pressure.
d) "When my vision improves, I will be able to stop taking the eye drops.": Vision may not improve with glaucoma treatment, and medications should be taken consistently to manage intraocular pressure, even if symptoms are controlled.
Correct Answer is D
Explanation
a) Allergic rhinitis: Allergic rhinitis typically causes symptoms like sneezing, itchy eyes, and nasal congestion, but it does not typically present with the toothache-like pain or the fullness in the head seen in sinusitis.
b) Impacted wisdom teeth: Impacted wisdom teeth may cause pain in the jaw or gums, but they would not be associated with the fullness in the head or symptoms specific to sinus pressure.
c) Nasal polyps: Nasal polyps can cause nasal congestion or a runny nose, but they usually don't cause the specific symptoms of headache, facial pain, or fullness seen in sinusitis.
d) Sinusitis: The symptoms described (morning headaches, fullness in the head, and pain similar to a toothache under the eye) are indicative of sinusitis, an inflammation of the sinuses, which can cause these specific types of discomfort.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.