Their study included 89 patients. Intraoperative flow measurements were performed on the outflow cephalic vein 5ñ10 mm distal to the radiocephalic anastomosis using 3-6 mm Transonic Flowprobes 5-10 min after creation of the arteriovenous (AV) anastomosis. Patients were assigned into one of two groups depending on their post-anastomotic fistula flows: 1) with high flow (> 200 mL/min) and 2) low flow (< 200 mL/min). They were then assessed clinically and with ultrasound every three months postoperatively during an observation period ranging from three months to three years.
The 1-year primary and secondary patency rates of patients were significantly higher in the high-flow group than in the low-flow group. From their data the clinicians concluded that intraoperative measurement of blood flow can be determined with relative ease and accuracy in vascular access surgery and is a useful tool to predict the outcome of maturation in autologous AV fistulas. The information is more objective and reliable than obtained by physical examination alone, and with this method, technical problems can be detected and corrected intraoperatively before closure of the site.
Cyrek AE, Bernheim J, Juntermanns B, Husen P, Pacha A, Hoffmann JN. Intraoperative use of transit time flow measurement improves patency of newly created radiocephalic arteriovenous fistulas in patients requiring hemodialysis [published online ahead of print, 2020 May 7]. J Vasc Access. 2020;1129729820916561. (Transonic Reference # VA11793AH)