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Figure 4 The extent of myocardium at risk versus the extent of region with prolonged T_CEC. (A) Plot of the extents of regions with prolonged T_CEC measured from the longitudinal M-mode strain-rate maps, and of the myocardium at risk measured from the stained cardiac specimens. Line of identity and the 95% confidence limits are indicated as dashed lines. (B) Bland and Altman analysis of differences between the extent of myocardium at risk and extent of region with prolonged T_CEC plotted against their mean. Horizontal dashed lines represent the limits of agreement between the two measurements (Abn.T_CEC: abnormal T_CEC; M.risk: myocardium at risk).