Wiseth R, Samstad S, Rossvoll O, Torp H G, Skjaerpe T, Hatle L
Department of Medicine, Regional Hospital, University of Trondheim, Norway.
J Am Soc Echocardiogr. 1993 May-Jun;6(3 Pt 1):279-85. doi: 10.1016/s0894-7317(14)80064-3.
To assess whether aortic valve replacement (AVR) results in changes in the flow velocity distribution in the left ventricular outflow tract (LVOT), 10 patients undergoing AVR for aortic stenosis were studied. By extracting velocity information from color flow maps as digital data, instantaneous cross-sectional velocity profiles were constructed. Velocity profiles obtained 1 to 3 days before AVR were compared with recordings made 3 months later. The LVOT velocity profiles were variably skewed both before and after surgery, and no systematic or uniform changes could be detected after AVR. The highest velocities were most often localized in the region from the center of the outflow tract diameter toward the septum both before and after surgery. At the time of peak flow the ratio of the maximum to the cross-sectional mean velocity was 1.38 +/- 0.13 before and 1.39 +/- 0.08 after AVR (NS), and the ratio of the maximum to the mean velocity time integral was 1.47 +/- 0.10 before and 1.56 +/- 0.10 after (NS). We conclude that AVR in patients with aortic stenosis does not result in a change in LVOT velocity profiles that will influence stroke volume estimates with the Doppler technique.
为评估主动脉瓣置换术（AVR）是否会导致左心室流出道（LVOT）血流速度分布发生变化，对10例因主动脉瓣狭窄接受AVR的患者进行了研究。通过从彩色血流图中提取速度信息作为数字数据，构建了瞬时横截面速度分布图。将AVR前1至3天获得的速度分布图与3个月后记录的进行比较。手术前后LVOT速度分布图均存在不同程度的倾斜，AVR后未发现系统性或一致性变化。手术前后，最高速度最常出现在从流出道直径中心向室间隔的区域。在血流峰值时，AVR前最大速度与横截面平均速度之比为1.38±0.13，术后为1.39±0.08（无显著性差异），最大速度与平均速度时间积分之比术前为1.47±0.10，术后为1.56±0.10（无显著性差异）。我们得出结论，主动脉瓣狭窄患者的AVR不会导致LVOT速度分布图发生变化，从而影响用多普勒技术估计的每搏输出量。
