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Figure 2 Effect of balloon pumping on coronary flow velocity among three groups according to the severity of proximal stenosis. APDV = time-averaged peak diastolic velocity (cm/s); DFVI = diastolic flow velocity integral (cm); IABP% = percent increase intra-aortic balloon pumping. Shaded bars = no significant stenosis; black bars = intermediate stenosis; open bars = severe stenosis.