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
Blood in the urine (hematuria) is not a typical finding in urinary retention. It may indicate other conditions such as infection, stones, or malignancy.
Choice B rationale
Cloudy urine is often a sign of infection, not typically associated with urinary retention. It can be caused by the presence of bacteria, white blood cells, or crystals.
Choice C rationale
Dark-colored urine can result from dehydration or certain foods and medications. It is not a specific finding of urinary retention.
Choice D rationale
Leakage of urine, also known as overflow incontinence, can occur in urinary retention. This happens when the bladder becomes overly full, and small amounts of urine leak out due to the pressure.
Correct Answer is D
Explanation
Choice A rationale
It is best practice to use a new cotton swab for each swipe to avoid contamination. Each area should be cleaned with a separate cotton swab.
Choice B rationale
Oil-based lubricants should not be used with catheters as they can interfere with the material of the catheter. Water-based lubricants are preferred.
Choice C rationale
Testing the balloon on the indwelling urinary catheter before insertion can lead to an increased risk of contamination and potential damage to the catheter.
Choice D rationale
Sterile gloves are essential to prevent infection during the insertion of an indwelling urinary catheter. Maintaining a sterile field is crucial.