BACKGROUND:: METHODS:: RESULTS:: All SVGs had a diameter stenosis (DS) >50% and 30% had a DS ≥70%. A significant FFR was present in 30% of patients. Ischemia along the territory of the SVG was present in 20% of patients. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of FFR <0.75 for the detection of ischemia on stress MPI were 50, 75, 33, 85, and 70%, respectively. The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of FFR <0.75 for detecting ≥70% DS on angiography were 33, 71, 33, 71, and 60%, respectively. There was no significant correlation between FFR and % DS (R = 0.1, P = 0.35). CONCLUSION