IRCT20190717044255N6 IRCT 2022-09-03 Arak University of Medical Sciences Arteriovenous fistula anastomosis in patients with chronic renal failure Comparison of proximal arteriovenous fistula anastomosis side by side to end in patients with chronic renal failure 2022-09-23 anticipated 72 Complete https://irct.ir/trial/65411 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The participants will be assigned to two groups A and B based on the randomization sequence that will be generated in advance. This sequence is unpredictable and its arrangement is completely random. Block randomization method with 8 blocks will be used to allocate the samples. In this way, by using the block method random number generation software, the randomization sequence will be produced according to the required sample size for two groups. In the beginning, all the modes that can arrange 2 letters A and B in a block of 8 are produced. Then a block will be selected randomly and by placement among the blocks, and the arrangement pattern in that block will be used to allocate the participants. Then this block will be placed in the main container and another block will be selected again. All these works will be done with a software called Sealed Envelope. In this method, concealment will also be observed. The concept of concealment is the unpredictability of assigning people to groups. In fact, the researcher will not be able to predict which group the next person will be in, Blinding description: Because this operation is performed while the patient is under anesthesia, the technique performed is not known to the patient, and each patient does not know his anastomosis method. But the project managers and outcome evaluators are aware of the type of anastomoses performed for patients and study groups. 3 Chronic renal failure. Intervention 1: First intervention group: In the first group, arteriovenous anastomosis will be performed in 36 patients who are candidates for arteriovenous fistula with the technique of connecting the end of the artery to the side of the vein in the proximal part. Intervention 2: Second intervention group: In the second group, arteriovenous anastomosis will be performed in 36 patients who are candidates for arteriovenous fistula with the technique of connecting the end of the artery to the end of the vein in the proximal part. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is No more information