Evaluation of left ventricular flow field changes after stress in patients with nonobstructive coronary artery disease using ultrasonic flow vector imaging.

After stress, the trends of the vortex area and cir changes in the control group were the same, with a decreasing trend at S1–S3.

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The cir showed an increasing trend at S1–S3, and the maximum cir for the entire cardiac cycle occurred at S1.

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