A nurse is teaching a class about pharmacodynamics.
The nurse should include that which of the following medication levels occurs when a medication is at the lowest serum concentration?
Toxic.
Peak.
Trough.
Half-life.
The Correct Answer is C
Choice A rationale
Toxic levels refer to concentrations of a medication that are high enough to cause harmful effects or poisoning. This is not related to the lowest serum concentration.
Choice B rationale
Peak levels are the highest concentration of a medication in the bloodstream after administration. This occurs after the drug is absorbed and distributed.
Choice C rationale
Trough levels occur when the medication is at its lowest concentration in the bloodstream, typically just before the next dose is due. Monitoring trough levels helps ensure therapeutic effectiveness while avoiding toxicity.
Choice D rationale
Half-life refers to the time it takes for the concentration of a drug in the bloodstream to decrease by half. It is not directly related to the lowest serum concentration at a specific point in time.
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Correct Answer is D
Explanation
Choice A rationale
Collecting two stool specimens from the same area of the stool is incorrect because specimens should be taken from different areas to ensure a representative sample of the stool for testing.
Choice B rationale
Using toilet paper to transfer the stool specimen is not recommended as it can contaminate the sample and interfere with test results.
Choice C rationale
Applying four drops of developing solution to each stool specimen is incorrect. The usual procedure involves applying a specific number of drops as indicated by the test instructions, which may vary.
Choice D rationale
Waiting 30 seconds after applying the developing solution is correct. This waiting period allows the test to react and provide accurate results for the presence of occult blood.
Correct Answer is A
Explanation
Choice A rationale
Reflex incontinence is caused by neurological impairment or damage, such as spinal cord injury, which results in a loss of voluntary control over urination. The bladder muscle contracts involuntarily, causing urine leakage.
Choice B rationale
Overflow incontinence occurs when the bladder cannot empty properly, leading to frequent or constant dribbling of urine. It is not typically associated with nerve damage from spinal cord injury.
Choice C rationale
Stress incontinence is caused by physical movement or activity—such as coughing, sneezing, or heavy lifting—that puts pressure on the bladder, leading to urine leakage. It is not related to nerve damage or neurological conditions.
Choice D rationale
Urge incontinence is characterized by a sudden, intense urge to urinate, followed by involuntary urine leakage. It is usually caused by an overactive bladder or other conditions affecting bladder function, but not directly by nerve damage from spinal cord injury.