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Figure 2 Tracings of simultaneous Pao, distal coronary artery pressure and an i.c. ECG lead obtained in a patient with little collateral recruitment during the three 2-min coronary artery occlusions (time: horizontal axis). The dotted line indicates a pressure of 5 mm Hg. The i.c. ECG ST segment elevations during the three occlusions remain constant. See Figure 1 for the calculation of the collateral flow index. Abbreviations as in Figure 1.