In both randomized groups, a final angiogram of the graft will be performed, and the residual stenosis at the site of the angioplasty quantified. In addition, intra-graft and systemic blood pressures will be measured upon completion of the intervention. These pressures will be measured directly through a disposable pressure transducer. The ratio of graft to systemic systolic pressure will be calculated. This ratio has been previously shown to be predictive of subsequent primary graft patency [1, 10].