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Figure 4 Improvement in exercise duration from baseline to six months in patients randomized to percutaneous transmyocardial revascularization (white bars) with the Eclipse holmium/yttrium aluminum garnet laser versus maximal medical therapy (black bars) in the present study (patients with non-revascularizable chronic total occlusions (CTOs); left bars) compared with a previous study with the same device in a different patient group (patients with end-stage ischemic heart disease with no revascularization options; right bars).