The Effect of Ultrasonography on Blood Flow,Vessel Diameter,and Depth Measurements in Dialysis Patients With Fistula

"Preoperative data will be collected from the latest available data within the last month. Preoperative Doppler ultrasonography venous mapping for all patients will be performed by experienced Radiology Specialists.~AVF flow measurement will be performed intraoperatively and at the 6th week postoperatively using Doppler ultrasonography (B-Mode and duplex ultrasound on the LOQIC; GE Healthcare Technologies, Milwaukee, Wisconsin, United States). For each patient, AVF flows will be recorded by taking at least 3 measurements of AVF flow, depth, and vascular diameters at 2, 5, 10, and 15 cm proximal to the AVF anastomosis, and arithmetic averages will be calculated. AVF flow will be expressed in ml/min, and the vascular structure diameters and the distance of AVF from the skin will be indicated in mm. AVF depth will be calculated as the distance from the skin to the anterior wall of the AVF."