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Figure 2 Signal Intensity-Time Curves and Stress Perfusion Images Demonstrating Changes in Hyperemic MBF After CTO PCI

Shown is a patient with CTO in the middle portion of the right coronary artery. Baseline, hyperemic MBF is reduced in the midventricular inferoseptal segment, subtended by the CTO, compared with a remote segment in the same slice (top left). Six months after PCI, hyperemic MBF in the revascularized inferoseptal segment has normalized (bottom left). Representative MRI images on the right panels are peak stress midventricular slices at corresponding imaging time points, displaying perfusion deficits in the inferoseptal and inferior segments at baseline (top, borders of the inferoseptal segment delineated by white arrows), which are no longer present 6 months after PCI (bottom). Remote anteroseptal segments are indicated by the black arrow. a.u. = arbitrary units; SI = signal intensity; other abbreviations as in Figure 1.