Impedance index measurements of in vitro PTFE end-to-side anastomoses: effect of angle and Miller cuff.

Abstract

To measure non-invasively the impedance index of a range of geometries of PTFE end-to-side anastomoses (ESA). In vitro experiments using a custom-built flow rig. Anastomoses constructed at each angle. (15 degrees, 30 degrees, 45 degrees, 60 degrees, 90 degrees, 120 degrees) for both standard and cuffed ESA. The impedance index of each ESA increased non-linearly with flow rate. The impedance index at a given flow rate was reduced by decreasing the anastomotic angle and further reduced by the addition of a Miller cuff. The reduction in impedance index achieved with a Miller cuff may help to explain the improved patency rates of femoropopliteal grafts incorporating a cuff.