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Figure 5 Plot of graft flow reserves in two different groups: grafts with stenosis <50% and grafts with significant stenosis or diseased run-off. Flow reserve in the non-significantly diseased grafts with a normal run-off (n = 10) and in the group of grafts with a significant stenosis or with a diseased run-off (n = 18) was 2.5 ± 0.7 versus 1.8 ± 0.9, respectively (*p = 0.04). An algorithm combining an absolute basal volume flow <20 ml/min or graft flow reserve <2 had a sensitivity of 78% and a specificity of 80%.