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Figure 1 Flow chart of study protocol. Chest pain = chest pain score; DES = drug-eluting stent; ECG = electrocardiogram; Pa = mean aortic pressure; Pd = coronary distal pressure; Pw = coronary wedge pressure; QCA = quantitative coronary angiography; Rentrop = angiographic grading of collateral circulation; TIMI = Thrombolysis In Myocardial Infarction flow grade; ST = sum of ST-segment elevation in all 12 leads as compared with baseline.