Final answer:
The nurse should mark the location of the client's distal pulses and regularly assess the client's affected extremity, which is a crucial component of immediate postoperative care following femoral artery revascularization to promptly detect any changes that may indicate complications.
Step-by-step explanation:
The proper action a nurse should take when caring for a client who is 4 hours postoperative following an arterial revascularization of the femoral artery includes assessing the client's affected extremity. The nurse should mark the location of the client's distal pulses to keep track of pulse strength and detect any changes promptly, which might indicate a complication like a blockage or reduced blood flow. Furthermore, it is essential to assess the client's affected extremity regularly - every 15 minutes initially, then every hour for a few hours, and then less frequently as per the hospital protocol, but certainly more often than every 2 hours. This is crucial to monitor for signs of compartment syndrome, bleeding, thrombosis, or other vascular complications. The use of a blood pressure cuff and a stethoscope are standard for different measurements, but monitoring postoperative pulses is typically a manual process. Placing a foam pillow under the knees or evaluating the ankle brachial index can be part of ongoing care, but are not the most immediate postoperative actions for monitoring arterial revascularization.