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目的：评价双胎妊娠胎儿脐动脉收缩期最大血流速度（Ｓ）与舒张末期血流速度（Ｄ）的比值（Ｓ／Ｄ）、搏动指数（ＰＩ）和阻力指数（ＲＩ）用于监测双胎输血综合征的临床价值。方法：应用Ｃ－多普勒超声仪对３２例正常双胎（对照组）和４例双胎输血综合征孕妇（观察组），测定脐动脉血流Ｓ／Ｄ比值，ＰＩ值和ＲＩ值。结果：孕３２～３４周后，观察组的脐动脉Ｓ／Ｄ比值和ＰＩ值明显高于对照组（Ｐ＜０．０１）。共发现２例双胎反向动脉灌流（ＴＲＡＰ）。结论：胎儿脐动脉Ｓ／Ｄ比值和ＰＩ值可作为监测双胎输血综合征的指标。
Objective: To evaluate the ratio of S / D, PI and RI in twin stage fetus umbilical artery systolic blood flow (S) and diastolic blood flow (D) Clinical value of fetal transfusion syndrome. Methods: 32 cases of normal twins (control group) and 4 cases of twin twin transfusion syndrome (observation group) were detected by C-Doppler. The S / D ratio, PI value and RI value of umbilical artery blood flow were measured. Results: After 32-34 weeks of pregnancy, the S / D ratio and PI of the umbilical artery in the observation group were significantly higher than those in the control group (P <0.01). A total of 2 cases of twin reverse arterial perfusion (TRAP) were found. Conclusion: The S / D ratio and PI value of fetal umbilical artery can be used as an indicator to monitor twin blood transfusion syndrome.