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Figure 4 Combined mean values (± SD, vertical lines) of the normalized intracoronary electrocardiographic (ECG) ST elevation (squares, vertical axis, left-hand side) and the collateral flow index (CFI) (triangles, vertical axis, right-hand side) during the three subsequent 2-min balloon occlusions (horizontal axis) for the patients pretreated with adenosine (A) and for those pretreated with normal saline (B).