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Figure 2 Electrocardiogram and coronary flow patterns in a patient without reperfusion syndrome. Primary PTCA of the mid-LAD was performed 255 min after the onset of chest pain. Panel A: Electrocardiogram pattern. The patient experienced a gradual decline of chest pain. The ECG obtained 1 min after reperfusion shows a partial resolution of ST segment elevation in leads V₁ to V₄: sum of ST segment elevation ( ${Sigma}$ ST) decreased from 14 to 4 mm. Panel B: Flow velocity pattern in the distal LAD 10 min after successful PTCA. On-line flow velocity spectrum and time-averaged peak velocity (APV) are displayed on the top screen. Bottom left and right screens indicate base (BAPV = 17 cm/s) and adenosine-induced hyperemic (PAPV = 35 cm/s) APVs, respectively. Residual coronary velocity reserve (RATIO) is 2.0. ECG = electrocardiogram; LAD = left anterior descending coronary artery; PTCA = percutaneous transluminal coronary artery.