A fistula for a dialysis patient is a very critical thing, if the kidney is not functioning properly and needs dialysis, an arteriovenous fistula can be a lifeline for the patient, so it is very critical. There are some potential problems compared to the criticality, but they are far less harmful than beneficial, so there is no harm in talking about fistulas for dialysis. One of the complications of dialysis fistulas is that the fistula may become blocked in the future, because the flow rate and flow are not sufficient, and if there is a growth of the endothelial wall of the vein bridge, it may form a restenosis at the anastomosis, or there may be a thrombosis, and the vessel may become blocked, and the fistula may not be used anymore. In addition, sometimes, after the fistula is done, the flow rate may not be enough because of the angle, the suture, and the vessel itself, and the fistula itself may not be completely successful, and then the flow rate is not enough, so it is not possible to use the fistula, but the operation is not successful in making the fistula. Therefore, in the long term, there is a possibility of restenosis and blockage, and in the near future, the fistula may not be used, mainly because of these two possibilities.