Is it normal for my father to have foot swelling after 1 year from open heart surgery when blood pressure and cholesterol levels are normal?

Would see MD: Your dad obviously has risk of peripheral vascular disease. He could have blood clot and if has associated calf pain would seek attention soon. If his saphenous vein was harvested he could just have increased edema in that leg from less outflow. I would talk to his surgeon or let family doc know.

Probably: Especially if the heart surgery was a bypass. A leg vein is often removed to use for the heart bypass. Veins drain blood out of the legs. If a vein was not removed, he may have other circulation or metabolic problems that tend to go along with heart circulation disease that can also cause swelling. May also be due to a local problem in foot not related to heart procedure at all. Need to check it.

Many possibilities: Swelling may last a long time following heart surgery. Have it evaluated by a professional and get the appropriate treatment.

Heart failure: Your father had bypass surgery for coronary blockage. He may also have some amount of heart failure. If he is still taking medications like Lasix (furosemide), or others, then his swelling may be from heart failure. He should continue to follow with his cardiologist. Weight loss, exercise, and cessation of smoking are critical components after coronary artery bypass surgery.