Final answer:
The nurse should monitor for cyanosis of the nail beds in an African-American client with peripheral arterial disease.
Step-by-step explanation:
The nurse should monitor for cyanosis of the nail beds in an African-American client with peripheral arterial disease. Cyanosis of the nail beds is a bluish or purple discoloration of the nail bed, indicating low oxygen saturation of the blood or inadequate blood flow to the extremities. This is a common sign of peripheral arterial disease.