Why do my feet swell after an angioplasty?

Healing. As the artery is healing, this will temporarily lead to a decrease blood flow to the feet. As the arteries heal and settle back to normal, the swelling will usually resolve. If this persists for many months, call your doctor.
Feet can . Swell after many surguries including hip, knee, ankle etc. When performing an angioplasty you are allowing new blood to flow as you opened a blockage so swelling occurs kind of like traffic occurring on a highway. Of course if there is a concern always consult your surgeon. Clotting can be a complication.