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Fig. 3B. —73-year-old woman with aorta to celiac artery bypass graft. Intraoperative sonogram with longitudinal views of distal anastomosis evaluation is shown. Spectral Doppler waveform in native artery reveals significant increase in peak systolic velocity up to 2.5 m/sec associated with significant change in caliber. Elevated velocities were seen throughout vessel, and no filling defect was detected. These findings are characteristic of graft–vessel mismatch.