Correct Answer: A

Rationale: The correct answer is to monitor the INR (International Normalized Ratio) for a patient receiving warfarin therapy. INR monitoring is crucial to assess the effectiveness of warfarin in preventing blood clots while minimizing the risk of bleeding. Monitoring sodium levels (choice B), potassium levels (choice C), or platelet count (choice D) is not specifically essential for patients on warfarin therapy and does not provide direct information on the drug's anticoagulant effects.

Correct Answer: A

Rationale: The nurse should document the time the medication was given in the client's medical record when administering an incorrect dose. This information is crucial for tracking the sequence of events leading to the error. Choice B, the client's response to the medication, is important for monitoring the client's condition post-administration but may not be directly linked to the incident report. Choice C, documenting the dose that was administered, is relevant but does not provide insights into the timing of events. Choice D, detailing the reason for the error, should be included in the incident report but may not need to be documented in the client's medical record.

Correct Answer: A

Rationale: The correct answer is to monitor potassium levels. Patients taking digoxin are at risk of developing toxicity due to hypokalemia. Low potassium levels can potentiate the toxic effects of digoxin on the heart, leading to serious arrhythmias. Monitoring calcium levels (Choice B) is not the primary concern in patients taking digoxin. While calcium levels play a role in cardiac function, hypocalcemia is not directly associated with digoxin toxicity. Monitoring sodium levels (Choice C) is important for other conditions but is not the primary concern in a patient taking digoxin. Monitoring magnesium levels (Choice D) is also essential, but hypomagnesemia is not as directly linked to digoxin toxicity as hypokalemia.

Correct Answer: C

Rationale: A respiratory rate of 12/min may indicate respiratory depression, a potential side effect of opioid analgesics. Respiratory depression can be a serious complication that requires immediate intervention. Monitoring the respiratory rate is crucial in clients receiving opioids to prevent adverse events. Oxygen saturation, blood pressure, and heart rate are important parameters to assess, but a low respiratory rate is a more critical finding that warrants immediate reporting to the healthcare provider.

Correct Answer: A

Rationale: The appropriate action when a patient presents with chest pain is to administer aspirin. Aspirin helps reduce the risk of clot formation by inhibiting platelet aggregation, which can be beneficial in cases of myocardial infarction. Nitroglycerin is commonly used for chest pain related to angina but is not the first-line treatment for all types of chest pain. Repositioning the patient may be necessary for comfort or assessment but is not the immediate priority. Surgery is not typically the first-line intervention for chest pain unless there are specific indications.