The nurse evaluates the effects of warfarin by monitoring what lab test?

Platelet count.

Activated thromboplastin time (APT).

Red blood count (RBC).

Prothrombin time (PT) and international normalized ratio (INR).

Answer and Explanation

The Correct Answer is D

Choice A rationale

Platelet count measures the number of platelets in the blood, which are essential for blood clotting. However, it is not specific to monitoring the anticoagulant effects of warfarin.

Choice B rationale

Activated thromboplastin time (APT) measures the intrinsic pathway of coagulation and is typically used to monitor heparin therapy, not warfarin.

Choice C rationale

Red blood count (RBC) measures the number of red blood cells in the blood, which can indicate anemia but is unrelated to the anticoagulant effects of warfarin.

Choice D rationale

Prothrombin time (PT) and international normalized ratio (INR) are specific tests used to monitor the anticoagulant effects of warfarin. PT measures the time it takes for blood to clot, and INR standardizes this measurement to ensure consistency across different laboratories.

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Correct Answer is D

Explanation

Choice A rationale

Ergotamine does not increase hypoperfusion. It is used to constrict blood vessels to reduce blood flow.

Choice B rationale

Ergotamine does not decrease hypoperfusion. It is used to constrict blood vessels to reduce blood flow.

Choice C rationale

Ergotamine does not increase hyperperfusion. It is used to constrict blood vessels to reduce blood flow.

Choice D rationale

Ergotamine decreases hyperperfusion by constricting blood vessels in the basilar artery vascular bed, reducing the blood flow to relieve migraine headaches. .

A. 45 minutes. B. 10 minutes. C. 30 minutes. D. 60 minutes.

Correct Answer is A

Explanation

Choice A rationale

Oral morphine typically reaches peak activity at around 45 minutes after administration. This allows time for the medication to be absorbed through the gastrointestinal tract and enter the bloodstream to provide pain relief.

Choice B rationale

10 minutes is too short for oral morphine to reach peak activity. This timeframe is more consistent with intravenous administration, which allows for rapid onset of action.

Choice C rationale

30 minutes is a bit too short for oral morphine to reach peak effect, although some patients may start to feel relief. However, peak plasma concentrations generally occur closer to 45-60 minutes.

Choice D rationale

While morphine can continue to have effects up to 60 minutes and beyond, the peak activity is typically observed around the 45-minute mark. Waiting for 60 minutes may underestimate the peak timeframe.

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The nurse evaluates the effects of warfarin by monitoring what lab test?

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Naxlex Comprehensive Predictor Exams

What is the action of ergotamine?

Correct Answer is D

Explanation

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Correct Answer is A

Explanation

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