Correct Answer: B

Rationale: After a mastectomy, particularly when lymph nodes are removed, there is an increased risk of lymphedema in the affected arm due to impaired lymphatic drainage. Elevating the affected arm above heart level helps promote lymphatic drainage and reduces the risk of swelling. This intervention facilitates the return of lymph fluid and helps prevent fluid accumulation in the arm.

Correct Answer: D

Rationale: After a mastectomy, particularly when lymph nodes are removed, patients are at increased risk for developing lymphedema, which is a buildup of lymph fluid that can cause swelling in the affected arm. Wearing tight clothing can constrict lymphatic flow and increase the risk of developing lymphedema by impeding normal lymphatic drainage. Therefore, it is crucial to advise patients to avoid tight-fitting clothing, especially around the chest and arm areas.

Correct Answer: B

Rationale: In the management of breast cancer, particularly after procedures such as a mastectomy, it is important to position the patient in a way that promotes healing and comfort. However, lying down with 1-2 pillows is not a standard practice for postoperative care. Instead, patients are often advised to elevate the affected arm to reduce swelling and promote drainage, and they may benefit from sleeping in a more upright position if they are experiencing discomfort. The focus should be on facilitating recovery rather than simply lying down.

Correct Answer: C

Rationale: The nurse should encourage the patient to consume 2 to 4 liters of fluid daily to reduce the risk of hypercalcemia.

Correct Answer: D

Rationale: Handling radioactive excreta requires special precautions; the nurse must be familiar with the facility's policies.