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Figure 3 Regional strain parameters at baseline and during ischemia. Systolic strain ({epsilon}sys) (left panel) was significantly reduced and even inverted (reflecting bulging), while postsystolic strain ({epsilon}ps) (right panel) significantly increased in the ischemic (solid square) but not in normally perfused segments (open circle). Some overlap between normal and ischemic {epsilon}sys and {epsilon}ps values was observed.