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. Author manuscript; available in PMC: 2016 Jul 13.
Published in final edited form as: Circ Cardiovasc Interv. 2015 Jun;8(6):e001715. doi: 10.1161/CIRCINTERVENTIONS.114.001715

Figure 4.

Figure 4

The relationship between pre-percutaneous coronary intervention (PCI) pressure-only physiological indices and the increase in hyperemic flow velocity after PCI. Hyperemic flow increases significantly following PCI. A ratio of pre-PCI and post-PCI hyperemic flow velocity was plotted using a third-order polynomial against the pre-PCI fractional flow reserve (FFR) value. Ratios above 1 suggest an increase in flow velocity, whereas those below 1 suggest a fall. iFR indicates instantaneous wave-free ratio.