Rossvoll O, Samstad S, Torp H G, Linker D T, Skjaerpe T, Angelsen B A, Hatle L
Department of Medicine, University of Trondheim, Norway.
J Am Soc Echocardiogr. 1991 Jul-Aug;4(4):367-78. doi: 10.1016/s0894-7317(14)80447-1.
The velocity distribution in the aortic anulus is commonly assumed to be uniform. A skewed velocity profile may have consequences for the accuracy of volume flow estimates by the Doppler echocardiographic technique. To assess this issue, the velocity distribution in the aortic anulus in 12 normal subjects was studied by computer analysis of digital velocity data from two-dimensional Doppler ultrasound flow maps. The velocity profiles in the aortic anulus were found to be flat but slightly skewed, with the highest velocities toward the septum. There was little interindividual variation. Our findings imply that the centerline velocity is the best estimate for the spatial mean velocity at the aortic anulus in normal subjects. The importance of this finding in patients is unknown. In normal subjects, the results suggest that stroke volume might be overestimated by approximately 15% by Doppler echocardiography if the cross-sectional velocity profile is not accounted for.
通常认为主动脉瓣环处的速度分布是均匀的。速度分布呈偏态可能会对多普勒超声心动图技术估算容积流量的准确性产生影响。为评估这一问题，通过对二维多普勒超声血流图的数字速度数据进行计算机分析，研究了12名正常受试者主动脉瓣环处的速度分布。发现主动脉瓣环处的速度分布呈扁平状但略有偏态，朝向室间隔的速度最高。个体间差异很小。我们的研究结果表明，中心线速度是正常受试者主动脉瓣环处空间平均速度的最佳估计值。这一发现对患者的重要性尚不清楚。在正常受试者中，结果表明，如果不考虑横截面速度分布，多普勒超声心动图可能会使每搏输出量高估约15%。
