Final answer:
The nurse should monitor for dyspnea, difficulty breathing, as it is a key symptom of angioedema when a patient is taking an ACE inhibitor.
Step-by-step explanation:
If a patient is taking an ACE inhibitor, the nurse should monitor for signs of angioedema. Angioedema is a condition characterized by the rapid swelling of the deeper layers of the skin and sometimes the mucosa and submucosal tissues. Among the signs of angioedema, dyspnea, or difficulty breathing, is a key symptom to watch for as it indicates potential swelling in the respiratory tract, which can be life-threatening.
Therefore, the correct answer to the question is B. Dyspnea. Signs of angioedema that the nurse should monitor for also include swelling of the face or limbs and, in some cases, abdominal cramping or pain. It's important to differentiate these symptoms from other conditions because angioedema can lead to serious complications if not treated promptly and appropriately.