Repeat surgery may be needed if grafted arteries or veins become blocked, or if new blockages develop in arteries that weren’t blocked before. Taking medicines as prescribed and making lifestyle changes that your doctor recommends can lower the chance of a graft becoming blocked. | Repeat surgery may be needed if grafted arteries or veins become blocked, or if new blockages develop in arteries that weren’t blocked before. Taking medicines as prescribed and making lifestyle changes that your doctor recommends can lower the chance of a graft becoming blocked. |