Correct Answer: B

Rationale: Digoxin is commonly prescribed to manage atrial fibrillation by controlling heart rate. While Warfarin is used to prevent blood clots, it is not primarily used for controlling heart rate in atrial fibrillation. Aspirin is not the first-line treatment for atrial fibrillation and is generally not recommended for rhythm control. Lisinopril is an ACE inhibitor used to treat high blood pressure and heart failure, but it is not typically prescribed as the primary medication for managing atrial fibrillation.

Correct Answer: D

Rationale: The correct answer is D: 'Trim toenails straight across.' In clients with diabetes, trimming toenails straight across is important to prevent ingrown toenails, reducing the risk of infections. Soaking feet in warm water daily (choice A) can lead to dry skin and potentially cause skin breakdown in diabetic clients. While wearing cotton socks (choice B) is beneficial for good foot hygiene, it is not as crucial as trimming toenails correctly. Applying lotion to feet after bathing (choice C) is helpful for moisturizing the skin, but the emphasis should be on nail care to prevent complications like ingrown toenails.

Correct Answer: B

Rationale: When caring for a patient with a central line, monitoring for infection is crucial. This is because central lines can introduce bacteria into the bloodstream, leading to serious infections. While flushing the line daily and changing the dressing weekly are important aspects of central line care, monitoring for infection takes precedence. Infections can occur rapidly and have severe consequences, so early detection through vigilant monitoring is key. Replacing the central line every week is not a standard practice and should only be done when clinically indicated, such as in cases of infection or malfunction.

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: D

Rationale: Instructing the patient to use the spirometer every hour is crucial for optimal lung expansion and to prevent postoperative pulmonary complications. This regular use helps to keep the lungs clear and maintain their capacity. Choices A, B, and C are incorrect because deep breathing, forceful coughing, and blowing into the spirometer do not specifically address the proper use of the incentive spirometer, which is essential for postoperative respiratory recovery.