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Figure 2 Resting transthoracic color-Doppler ultrasound. (A to C) Patient without competitive left internal mammary artery (LIMA) graft flow. Color Doppler (A) shows LIMA and left anterior descending (LAD) flows (arrows), and corresponding pulsed Doppler ultrasound shows prominent diastolic velocity (B and C). (D to G) Patient with flow competition. The LIMA flow (D and E) shows a prominent systolic and a very low diastolic component, whereas LAD flow (F and G) is mainly diastolic.