目的：应用即时血流测量技术术中评估冠状动脉桥的通畅性。
Objective: Assessment of graft patency following coronary artery bypass graft (CABG) by transit time flow meter technique.
改变模拟冠状血管的狭窄程度，使用超声血流检测仪测量不同狭窄程度时移植血管的即时血流量。
Adjust different degrees of stenosis, and measure the transient time blood flow of bypassed grafts in different degrees of stenosis with transient time flow measurement (TTFM).
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