Pathophysiology of Peripheral Vascular Disease

Mr. Cook is a 76-year-old African American man admitted to the ED with pain in both legs. His history includes a left femoral popliteal bypass 5 years ago.
Smoking history of 45 pack years. Diabetic for 30 years, insulin controlled. He has a diminished right femoral pulse, a popliteal pulse with Doppler only;
posterior tibial and pedal pulses are absent. Describe the pathophysiology of Peripheral Vascular Disease? What are the top 3 nursing priorities for this
patient? What teaching would you need to include in the plan of care for this patient?