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Figure 1 Simultaneous determination of intracoronary flow velocity (cm/s) and pressure (mm Hg) measurements. The flow velocity trend over 90 s is shown during vessel occlusion (Voccl) and during vessel patency (Vø-occl) in the left upper panel of the figure. In the upper part, the instantaneous flow velocity signal (cm/s) during vessel occlusion is represented. On the right, simultaneous aortic (Pao) and distal occlusive (Poccl) pressure is shown. The pressure-derived collateral flow index (CFIP) was calculated as follows: (Poccl – 5)/(Pao – 5). Doppler-derived CFIV: Voccl/Vø-occl. CFIv = velocity-derived index of collateral flow.
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