Correct Answer: A

Rationale: Hypokalemia, which is low potassium levels, can disrupt the normal electrical activity of the heart and lead to ventricular dysrhythmias. Potassium plays a crucial role in maintaining the heart's rhythm, and a deficiency can result in dangerous heart rhythm abnormalities.

Correct Answer: B

Rationale: The correct answer is B. Taking frequent walks and avoiding prolonged bed rest are essential measures to promote circulation and reduce the risk of thrombophlebitis. Physical activity helps prevent blood from pooling and clotting in the veins, thus decreasing the likelihood of thrombophlebitis development.

Correct Answer: B

Rationale: After being transferred from the CCU to the general medical unit with cardiac monitoring, the client with MI is typically prescribed bathroom privileges and self-care activities. This allows for gradual recovery and mobility while still being closely monitored, promoting the client's overall well-being and independence.

Correct Answer: B

Rationale: Increasing sodium intake is essential when taking lithium to counteract the risk of developing hyponatremia. Lithium can lead to decreased sodium levels, so increasing sodium intake can help maintain an adequate balance and prevent complications.

Correct Answer: A

Rationale: Elevated BNP levels are indicative of heart failure, which often causes fluid retention and weight gain. Taking daily weights and monitoring trends allows the nurse to assess for changes in fluid status. This intervention helps in evaluating the effectiveness of the treatment plan and identifying worsening heart failure symptoms early.