what is the therapeutic use of phenytoin
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Nursing Elites

ATI RN

ATI Pharmacology Test Bank

1. 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.

2. A client is receiving daily doses of Oprelvekin. Which of the following laboratory values should be monitored to determine the effectiveness of this medication?

Correct answer: C

Rationale: Oprelvekin is a medication that stimulates platelet production. Therefore, monitoring the platelet count is essential to assess the effectiveness of this drug. The expected outcome for oprelvekin therapy is a platelet count greater than 50,000/mm^3. Changes in platelet count can indicate the response to the medication and help in adjusting the treatment plan accordingly. Monitoring hemoglobin, absolute neutrophil count, or total white blood cell count is not directly related to the mechanism of action of Oprelvekin and therefore would not provide accurate information on the drug's effectiveness.

3. In an acute mental health facility, a patient experiencing opioid withdrawal has a new prescription for Clonidine. What action should the nurse identify as the priority?

Correct answer: D

Rationale: In this scenario, the priority action for the nurse is to obtain baseline vital signs. This is essential for establishing a baseline assessment, especially for a patient undergoing opioid withdrawal and starting a new medication like Clonidine. Monitoring vital signs is crucial for evaluating the patient's response to treatment and detecting any potential complications early on. Administering the medication, providing ice chips, and educating the patient on Clonidine's effects are important tasks but obtaining baseline vital signs takes precedence to ensure the patient's safety and proper management.

4. A client with Graves' disease is being taught about her prescribed medications. Which of the following statements by the client indicates an understanding of the use of Propranolol in the treatment of Graves' disease?

Correct answer: C

Rationale: The correct answer is C. Propranolol is a beta-adrenergic antagonist that helps decrease heart rate and control tremors in individuals with Graves' disease. It does not increase blood flow to the thyroid gland (choice A), prevent excess glucose in the blood (choice B), or directly decrease thyroid hormone levels in the body (choice D). Propranolol's primary role in Graves' disease is to alleviate symptoms like tremors and fast heart rate by blocking the effects of excessive thyroid hormone, rather than reducing the actual levels of thyroid hormone in the body.

5. A client has a new prescription for levothyroxine. Which of the following instructions should the nurse include?

Correct answer: C

Rationale: Levothyroxine should be taken on an empty stomach in the morning to enhance its absorption. This timing allows for optimal absorption and effectiveness of the medication. Taking it with food, at bedtime, or with an antacid may interfere with its absorption and reduce its efficacy.

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