the diastolic peak velocity (vd) and diastolic velocity time integral(vtid) in saphenous vein grafts was significantly less than in left internal mammary artery grafts (p0.05).
左乳内动脉桥管的舒张期血流速度及流速时间积分大于大隐静脉桥管(p0.05)。
objective to discuss the value of minimum systolic and diastolic peak velocity ratio(s/d) and pulse index(pi) of the umbilical artery of pregnant twins in predicting perinatal outcome.