Angioplasty is actually a relatively small, less invasive, and less bleeding procedure, and is relatively safe. However, there are some risks. The most important risk is that the arterial blood enters the vein directly after the fistula, which can increase the burden on the heart by 10-20%. If the incision between the artery and the vein is wide, that is, if the arterial blood enters the vein too fast, then it will increase the burden on the heart by 20-30%. Since heart failure is often associated with heart disease in uremic patients, the additional burden on the heart can easily induce heart failure, which can lead to chest congestion, tightness, and inability to lie down after the procedure. The size of the incision is the size of the fistula is generally around 0.5cm, 5mm is enough, any larger will lead to theft syndrome and a significant increase in heart burden, which can lead to increased heart failure.