phenytoin is an antiarrhythmic and anticonvulsant that has an unlabeled use for
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Nursing Elites

ATI RN

ATI Proctored Pharmacology Test

1. Phenytoin is an antiarrhythmic and anticonvulsant that has an unlabeled use for:

Correct answer: C

Rationale: Phenytoin, an antiarrhythmic and anticonvulsant medication, is also used off-label for treating neuropathic pain. While its primary indications are for managing heart rhythm disorders and seizures, it has shown efficacy in managing neuropathic pain, expanding its clinical utility. Choices A, B, and D are incorrect as phenytoin is not commonly used for headaches, cold remedies, or antianxiety purposes.

2. A client is taking Ritonavir, a protease inhibitor, to treat HIV infection. The nurse should monitor for which of the following adverse effects of this medication?

Correct answer: D

Rationale: The correct answer is D: Hyperlipidemia. Ritonavir, a protease inhibitor used in HIV treatment, can lead to hyperlipidemia, characterized by increased cholesterol and triglyceride levels. Monitoring lipid levels is crucial to identify and manage this potential adverse effect. Choices A, B, and C are incorrect because Ritonavir is not known to cause an increased TSH level, decreased ALT level, or hypoglycemia as adverse effects.

3. What is the therapeutic use of Phenytoin?

Correct answer: C

Rationale: Phenytoin is primarily used to diminish seizure activity and is effective in terminating ventricular arrhythmias. It works by stabilizing neuronal membranes, reducing repetitive neuronal firing, and limiting the spread of seizure activity in the brain. While phenytoin does not have a direct role in preventing thrombus formation or extending existing thrombi, it is crucial in managing seizures and certain arrhythmias.

4. A healthcare professional is caring for a client who is receiving heparin therapy. Which of the following laboratory tests should the healthcare professional monitor to evaluate the therapeutic effect of heparin?

Correct answer: C

Rationale: The correct test to monitor the therapeutic effect of heparin is the activated partial thromboplastin time (aPTT). Heparin's action is to prolong the clotting time, and aPTT reflects this effect. Monitoring aPTT helps ensure that the client is within the therapeutic range to prevent clot formation while minimizing the risk of bleeding complications. PT/INR is used to monitor warfarin therapy, platelet count assesses for potential thrombocytopenia, and WBC count evaluates for signs of infection or inflammation, not the therapeutic effect of heparin.

5. A nurse is evaluating teaching for a client who has Rheumatoid Arthritis and a new prescription for Methotrexate. Which of the following statements by the client indicates understanding of the teaching?

Correct answer: C

Rationale: Ulcerations in the mouth, tongue, or throat are often the first signs of methotrexate toxicity and should be reported to the provider immediately.

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