The interposition arteriovenous loop revisited.

In clinical situations when both arterial and venous interposition vein grafts are mandatory, we invariably harvest a single graft of adequate length to create an initial arteriovenous loop. This concept deserves reemphasis, as satisfactory recipient anastomoses can be achieved prior to bisecting the loop, with subsequent immediate donor tissue transfer. Concern for prolonged warm ischemia time is thereby minimized.