To improve patency of the low flow, low pressure crossover venous graft for unilateral iliac venous occlusions, complementary arteriovenous fistula has been effective. Two additional anastomoses are usually required to construct a complementary A-V fistula, and a sometimes difficult and potentially dangerous dissection may be required to take down the fistula. A technique has been developed for producing an A-V fistula with only one additional anastomosis. This fistula can be obliterated later by tightening a previously placed loop left in a subcutaneous position. This technique has been used successfully in two patients.
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