Final answer:
The medical assistant should inform the patient about the possibility of swelling of the affected arm, which is a common symptom of lymphedema following a radical mastectomy and lymphadenectomy.
Step-by-step explanation:
The medical assistant should inform the patient who underwent a right-sided radical mastectomy and lymphadenectomy about the possibility of swelling of the affected arm. This is a manifestation of lymphedema, a condition that can develop when lymph nodes are removed or damaged as part of the treatment for cancer, leading to a blockage in the lymphatic system and resulting in swelling due to fluid accumulation in the tissues. Educating the patient on this symptom is critical as it is a common and potentially chronic concern post-surgery.
Manifestations such as chest pain, headache, and blurred vision are not typical symptoms of lymphedema following mastectomy and lymphadenectomy. Instead, these might indicate different medical issues that should be evaluated by a healthcare provider. The focus should be on the change in the arm's size, feeling of heaviness or tightness, decreased flexibility in the wrist or hand, and any aching or discomfort in the area.