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Figure 3 Adjustment of balloon timing during coronary flow velocity recording. Coronary flow velocity during 1:2 balloon pumping in a patient with high-risk percutaneous transluminal coronary angioplasty. Upper panel shows coronary flow velocity and lower panel shows aortic blood pressure. (A) Delayed inflation; there is a notch between diastolic deceleration flow and augmentation flow (arrow). (B) Optimal timing of balloon control; diastolic flow augmentation coincides with the upstroke of diastolic acceleration flow velocity (arrow). (C) Early deflation; flow velocity is terminated early before the R- wave on electrocardiogram (arrows).