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Figure 1 Behavior of heart rate (top), systolic and diastolic arterial pressure (bottom) at baseline, during adenosine (ADN) in the first 30 s following the appearance of ST segment shift (early ischemia) at maximum ST displacement (max ischemia), early after intracoronary administration of nitrates (early rec), at restoration of baseline hemodynamics (full rec) and during balloon coronary occlusion. Circles connected by the thicker line represent average, vertical linesshow SDs. Heart rate and arterial pressure remained relatively stable throughout the study.