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首页> 外文期刊>Osaka City Medical Journal >Effects of Different Sampling Points on Evaluation of Fetal Descending Aortic Flow
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Effects of Different Sampling Points on Evaluation of Fetal Descending Aortic Flow

机译：不同采样点对胎儿降主动脉血流评估的影响

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Background Widespread use of fetal aortic blood flow velocity measurements for assessment of fetal circulatory status has been precluded by difficulties in achieving an adequate Doppler insonation angle at particular sampling points. The goal of this study was to evaluate the differences in resistance index (RI) and systolic peak velocity (Vmax) of fetal aortic blood flow velocity waveforms throughout gestation among various Doppler sampling points. Methods A total of 551 normal women between 18-41 weeks of pregnancy participated in this study. Pulsed Doppler flow velocity waveforms were acquired from three different aortic sampling points (thoracic portion, beneath the diaphragm, and abdominal portion) of the fetal descending aorta. The Vmax and RI were calculated at the respective sampling points. Results The Vmax were significantly lower in abdominal portion than those in thoracic portion at every time point (from 69±11 cm/second in thoracic to 49±8 cm/second in abdominal portion at 18-19 gestational weeks, p < 0.0001), and RI were also lower (from 0.84±0.05 in thoracic portion to 0.76±0.05 in abdominal portion at 18-19 gestational weeks, p < 0.0001). Significant increase in the Vmax was seen until third trimester (from 58?10 cm/second at 18-19 gestational weeks to 113±13 cm/second at 38-39 gestational weeks beneath the diaphragm, p < 0.0001), while the RI remained stable (0.79±0.04 at 18-19 gestational weeks; 0.80±0.05 at 38-39 gestational weeks beneath the diaphragm). Conclusions In measuring the fetal circulatory status, these data demonstrate that the sampling point should be considered when evaluating the maximum systolic velocity and the resistance index of the fetal descending aorta.
机译：背景技术由于在特定的采样点难以获得足够的多普勒超声角而难以使用胎儿主动脉血流速度测量来评估胎儿的循环状况。这项研究的目的是评估在整个多普勒采样点之间整个妊娠过程中胎儿主动脉血流速度波形的阻力指数（RI）和收缩期峰值速度（Vmax）的差异。方法共有551名正常女性在怀孕18-41周之间参加了这项研究。脉冲多普勒流速波形是从胎儿降主动脉的三个不同主动脉采样点（胸部分，diaphragm下和腹部）采集的。 Vmax和RI是在各个采样点计算的。结果在每个时间点，腹部的Vmax均显着低于胸腔的Vmax（从妊娠18-19周的胸腔的69±11 cm /秒降低到腹部的49±8 cm /秒，p <0.0001），和RI也较低（在妊娠18-19周时，胸部分为0.84±0.05，腹部分为0.76±0.05，p <0.0001）。直到孕中期，Vmax明显增加（从孕18-19周的58？10 cm /秒增加到diaphragm肌下方38-39周的113±13 cm /秒，p <0.0001），而RI保持稳定（在18-19个孕周时为0.79±0.04;在diaphragm下38-39个孕周时为0.80±0.05）。结论在测量胎儿的循环状态时，这些数据表明，在评估最大降压速度和胎儿降主动脉阻力指数时应考虑采样点。

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