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Figure 2 Regional strain rate parameters during baseline and acute ischemia. A significant change in regional peak strain rate during ejection (S_SR), isovolumic relaxation (IVR_SR) and early filling (E_SR) occurred in the ischemic segments (solid square) but not in normally perfused segments (open circle). No overlap between normal and ischemic was found for IVR_SR/S_SR ratio. Values from all 28 animals and all three perfusion territories are displayed, except for IVR_SR/S_SR (25 animals).