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 C
Explanation
a) Has no serious complications: Bacterial pharyngitis, especially streptococcal pharyngitis, can have serious complications, such as rheumatic fever or glomerulonephritis, which are not seen with viral pharyngitis.
b) Presents a negative culture: Bacterial pharyngitis typically presents with a positive throat culture for bacteria, while viral pharyngitis typically shows a negative culture.
c) Has an abrupt onset: Bacterial pharyngitis often has a sudden and severe onset of symptoms, while viral pharyngitis tends to have a more gradual onset.
d) Presents a normal complete blood count (CBC): In bacterial pharyngitis, the CBC may show an elevated white blood cell count, while in viral pharyngitis, the CBC may remain normal or slightly elevated.
Correct Answer is ["A","C","D"]
Explanation
a) Validate that the battery is correctly placed: Ensuring the battery is correctly placed is a crucial first step when troubleshooting a hearing aid, as improper placement can prevent the device from working.
b) Open the earpiece to see if the microphone wire is connected: Opening the earpiece is unnecessary unless there is a visible issue with the device. The first step should be checking the battery and the device settings.
c) Check to see if the device is turned on: It's important to verify that the hearing aid is powered on, as a common issue could be that the device was accidentally turned off.
d) Clean the earpiece and remove cerumen clogged in the vent: Cerumen buildup can block sound transmission, so cleaning the earpiece and vent is an important step in maintaining proper functionality of the hearing aid.
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