what is the therapeutic action of phenytoin
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Nursing Elites

ATI RN

ATI Pharmacology Proctored Exam 2024

1. What is the therapeutic action of Phenytoin?

Correct answer: B

Rationale: Phenytoin is primarily used as an anticonvulsant to prevent and control seizures. It works by stabilizing electrical activity in the brain, making it effective in managing conditions like epilepsy. Antidiabetic medications are used to regulate blood sugar levels, mood stabilizers help manage mood disorders, and antianxiety agents are used to reduce anxiety symptoms, none of which are the primary therapeutic action of Phenytoin.

2. A preschooler weighing 44 lb is to receive Amoxicillin 20 mg/kg/day PO divided equally every 12 hr. The available amoxicillin suspension is 250 mg/5 mL. How many mL should the nurse administer per dose?

Correct answer: A

Rationale: To calculate the dosage per administration: First, convert the weight to kg (44 lb / 2.2 lb/kg = 20 kg). Then, calculate the required dosage per dose: (20 mg/kg/day x 20 kg) / 2 (for every 12 hr dosing) = 200 mg per dose. To determine the mL per dose, divide the required dosage by the concentration of the amoxicillin suspension: (200 mg / 250 mg) x 5 mL = 4 mL per dose. Therefore, the correct answer is 4 mL. Choice B (5 mL) is incorrect because the correct calculation yields 4 mL. Choices C (6 mL) and D (3 mL) are also incorrect as they do not align with the accurate calculation based on the provided information.

3. A client has a prescription for Nitroglycerin, and a nurse is providing teaching. Which of the following instructions should the nurse include?

Correct answer: B

Rationale: The correct instruction for taking Nitroglycerin is to take one tablet at the onset of chest pain, then repeat every 5 minutes for up to three doses. Option A is incorrect because taking a tablet every 15 minutes until pain is relieved may lead to delayed intervention. Option C is incorrect as taking Nitroglycerin at bedtime is not indicated for chest pain. Option D is incorrect as Nitroglycerin should be taken sublingually at the onset of chest pain, not on an empty stomach.

4. A client has been prescribed Aspirin for prevention of cardiovascular disease. Which of the following findings indicates the medication is effective?

Correct answer: C

Rationale: The correct answer is C. A decrease in episodes of angina indicates that Aspirin is effectively preventing the formation of clots that could lead to cardiovascular events. Angina is chest pain or discomfort caused by reduced blood flow to the heart muscle, usually due to coronary artery disease. Aspirin works by inhibiting platelet aggregation, thereby reducing the risk of clot formation in the arteries. Improvement in angina symptoms suggests that the medication is successfully preventing clot-related complications in the cardiovascular system. Monitoring and recognizing a decrease in angina episodes can be a valuable indicator of the medication's efficacy in preventing cardiovascular events. Choices A, B, and D are incorrect because a decrease in troponin levels, a regular heart rhythm, or stable blood pressure, while important parameters, do not directly reflect the effectiveness of Aspirin in preventing cardiovascular events through antiplatelet action.

5. A client is reviewing a new prescription for Terbutaline with a history of preterm labor. Which of the following client statements indicates understanding of the teaching?

Correct answer: C

Rationale: The correct answer is C. The client should report increasing intensity, frequency, or duration of contractions to the provider as these are signs of preterm labor. Monitoring contractions is crucial for the management of preterm labor and the safety of both the client and the fetus. Choices A, B, and D are incorrect because increasing activity, fluid intake, or assuming the medication will prevent preterm labor do not address the essential need to report changes in contractions, which are a vital sign of potential complications in preterm labor.

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