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Figure 2 Plots of coronary flow reserve (CFR) (y axis) and fractional flow reserve (FFR) (x axis) in all patients before treatment (left), during abciximab infusion (center), and after stenting (right). No correlation was observed between these two descriptors of stenosis severity. After stenting, the persistence of abnormal flow reserve was not caused by persistence of a pressure drop along the epicardial segment.