1. When a patient is estimated to need hemodialysis within a year or when creatinine clearance is <25 ml and creatinine >4 mg/dl, an autologous internal fistula should be considered; 2. For patients who are not prepared to do an autologous internal fistula or who do not have an alternative vessel for an autologous internal fistula, choose a graft-vascular bypass for an internal fistula at least -6 weeks in advance of the procedure; because it takes about 3 weeks for the graft vessel to mature to allow wound healing and If a temporary double-lumen catheter is used, it should not be placed early, but can be inserted during dialysis; 4. If the arteriovenous endovascular fistula is done earlier than the expected start of hemodialysis, there will be enough time to ensure the maturation of the endovascular fistula and, in case of failure, there will be time to perform another vascular access, which will avoid the use of central venous cannula.