Final answer:
The nurse should measure the abdominal girth and check pulses.
Step-by-step explanation:
The nurse's best action in this situation would be to measure the abdominal girth and check pulses. Coolness of the extremities and a bloated feeling in the abdomen can be signs of decreased blood flow, which may indicate a complication following surgical repair of an abdominal aortic aneurysm (AAA). By measuring the abdominal girth and checking pulses, the nurse can assess for any changes in vascular status and address them appropriately.