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Figure 1 Coronary flow velocity and pressure recordings demonstrating the effects of intra-aortic balloon pumping. (A) Left panel shows phasic coronary flow velocity during 1:2 balloon pumping in a patient with congestive heart failure and high-risk coronary angioplasty (two-vessel disease). First and third coronary flow velocity (CFV) is with augmented beat, and second and fourth CFV is with non-augmented beat. Diastolic CFV is augmented with balloon pumping. Right panel shows aortic pressure. The diastolic pressure before the balloon pumping is shown at D1. The augmented diastolic pressure was labeled S2. (B) Coronary flow velocity and aortic pressure in a patient with recent anterior MI and left main coronary stenosis plus two-vessel disease. First and third CFV is with augmented beat, and second and fourth CFV is with non-augmented beat. Again, diastolic CFV is enhanced with augmented beat.