A client who was recently diagnosed with atrial fibrillation is receiving warfarin. To see the drug's effectiveness, which laboratory finding should the practical nurse (PN) review?

Complete blood count.

Serum troponin levels.

Creatinine clearance.

Prothrombin time (PT)

Answer and Explanation

The Correct Answer is D

Choice A: A complete blood count (CBC) is important for monitoring various aspects of the blood, including the number of red blood cells, white blood cells, and platelets. While important for assessing overall health, a CBC is not the primary laboratory finding used to assess the effectiveness of warfarin in managing atrial fibrillation.

Choice B: Serum troponin levels are typically measured to assess cardiac muscle damage, such as in myocardial infarction (heart attack). They are not the primary indicator for assessing the effectiveness of warfarin in atrial fibrillation.

Choice C: Creatinine clearance is a measure of kidney function and is not the primary laboratory finding used to evaluate the effectiveness of warfarin.

Choice D: Prothrombin time (PT) is the most relevant laboratory finding for monitoring the effectiveness of warfarin in clients with atrial fibrillation. Warfarin's therapeutic effect is primarily assessed through PT measurements, with the goal of maintaining the client's international normalized ratio (INR) within a specific target range to prevent excessive bleeding or clotting.

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Free Nursing Study Resources

Correct Answer is C

Explanation

Choice A: Permethrin cream may cause temporary itching and skin irritation as it works to eliminate the scabies mites. Instructing the client to remove the cream immediately if pruritis occurs is not necessary; it is a common and expected side effect during treatment.

Choice B: Reapplication of permethrin is not typically done in seven days unless directed by the healthcare provider. A single application is often effective in treating scabies.

Choice C: Showering or bathing 8 to 14 hours after permethrin treatment is a common instruction to remove the cream and dead mites. This is an important part of the treatment process.

Choice D: Avoiding areas between fingers and toes during application is not necessary, as permethrin is generally safe for use on these areas. However, it should not be applied to the face or near the eyes.

A. Increased Ca+ influx with sympathetic stimulation that raises the heart rate. B. Sympathetic activation boosts K+ efflux and increases the inotropic effect. C. Sympathetic activation decreases dromotrophy by lowering conduction speed. D. Increased Na+ influx with sympathetic stimulation reduces pacemaker firing.’

Correct Answer is A

Explanation

Choice A: Increased Ca+ influx with sympathetic stimulation that raises the heart rate is a manifestation of sympathetic innervation. Sympathetic activation leads to the release of norepinephrine, which enhances the influx of calcium ions (Ca+) into cardiac muscle cells, resulting in increased contractility and heart rate.

Choice B: Sympathetic activation does increase the inotropic effect (contractility) of the heart, but it is primarily mediated by the increased influx of calcium ions (Ca+).

Choice C: Sympathetic activation does not decrease dromotrophy (conduction speed). Instead, it can increase the conduction speed through the cardiac conduction system.

Choice D: Increased Na+ influx with sympathetic stimulation does not reduce pacemaker firing; instead, it contributes to the enhanced excitability and automaticity of cardiac cells.

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A client who was recently diagnosed with atrial fibrillation is receiving warfarin. To see the drug's effectiveness, which laboratory finding should the practical nurse (PN) review?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

An adult client receives a prescription for permethrin (Acticin Cream 5%) to treat an infestation of scabies. The nurse instructs the client to massage the cream into the skin from the head to the soles of the feet, avoiding the eyes. Which additional instruction should the nurse provide?

Correct Answer is C

Explanation

Which pathology of autonomic cardiac regulation is mediated by sympathetic innervation?

Correct Answer is A

Explanation

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