Final answer:
The LPN/LVN sitting the patient in a bedside chair for 90 minutes requires the RN to intervene.
Step-by-step explanation:
Among the actions mentioned, the one that requires the RN to intervene is when the LPN/LVN has the patient sit in a bedside chair for 90 minutes. This is because patients who have had a femoral-popliteal bypass graft need to be encouraged to ambulate and move the affected leg, rather than sitting for extended periods of time. Prolonged sitting can increase the risk of blood clots, deep vein thrombosis, and impair the circulation of the affected limb. Therefore, the RN should intervene and ensure that the patient is encouraged to ambulate and not sit for long periods.