Blood velocity profile in the ductus venosus inlet expressed by the mean/maximum velocity ratio
Blood velocity profile in the ductus venosus inlet expressed by the mean/maximum velocity ratio
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DOI：
10.1016/s0301-5629(98)00131-8
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发表时间：
1998-11-01
影响因子：
2.9
通讯作者：
Hanson, NA
中科院分区：
文献类型：
--
作者：
Kiserud, T;Hellevik, LR;Hanson, NA
平均血流速度（V(Mean)）用于计算血流和可能的压力。斜面穿过静脉导管。来自邻近船只的低速干扰使得直接多普勒测量V（平均值）不可靠。因此，有人建议，一旦速度剖面以比值V(mean)/V（max）表示，就可以更可靠地从最大速度（V(max)）推导出V（mean）。为了确定这一比值，我们在10只胎羊的急性实验中，在全身麻醉下进行超声检查，以确保良好的记录控制和最佳的超声，基于静脉导管进口的33次多普勒测量，无论V（max）脉搏指数、血管直径或超声角度如何，V(mean)/V（max）的比值为0.69 （SD +/- 0.07）。这些结果证实了先前基于计算模型的预测，即速度剖面部分钝化，建议使用公式V(mean) = 0.7V（max）来确定静脉导管的V（mean）。(C) 1998年世界超声医学和生物学联合会。
Mean blood velocity (V(mean)) is needed for calculating blood flow and possibly the;pressure. gradient across the ductus venosus. Interference from low velocities from neighbouring vessels makes the direct Doppler measurement of V(mean) unreliable. Therefore, it is suggested that V(mean) can be derived more reliably from the maximum velocity (V(max)) once the velocity profile, expressed as the ratio V(mean)/V(max), is known. To determine this ratio, ultrasound was performed in 10 fetal sheep during acute experiments under general anaesthesia to ensure good recording control and optimal insonation, Based on 33 Doppler measurements at the ductus venosus inlet, the ratio V(mean)/V(max) was determined to be 0.69 (SD +/- 0.07) regardless of V(max) pulsatility index, vessel diameter, or angle of insonation, These results confirm the previous prediction based on a computational model that the velocity profile is partially blunted, The equation V(mean) = 0.7V(max) is recommended for determining V(mean) in the ductus venosus. (C) 1998 World Federation for Ultrasound in Medicine & Biology.