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

Increased Ca+ influx with sympathetic stimulation that raises the heart rate.

Sympathetic activation boosts K+ efflux and increases the inotropic effect.

Sympathetic activation decreases dromotrophy by lowering conduction speed.

Increased Na+ influx with sympathetic stimulation reduces pacemaker firing.’

Answer and Explanation

The Correct Answer is A

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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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. Bladder palpation. B. Blood glucose monitoring. C. Inspection of the mouth. D. Auscultation of breath sounds.

Correct Answer is C

Explanation

Choice A: This is not specifically related to the side effects of phenytoin.

Choice B: This is not directly related to the common side effects of phenytoin, which primarily affect the oral cavity.

Choice C: Phenytoin (Dilantin) is known to cause gingival hyperplasia (enlargement of the gums) as a common side effect. The nurse should regularly inspect the client's mouth to monitor for this adverse effect.

Choice D: This is not specifically relevant to monitoring for phenytoin's side effects.

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

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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

What assessment technique should the nurse use to monitor a client for a common untoward effect of phenytoin (Dilantin)?

Correct Answer is C

Explanation

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