Clinical interpretation — An S/D ratio >3.0 or RI >0.6 at ≥28 weeks of gestation is the best threshold for identifying pregnancies at high risk of adverse outcome. 苏州大学附属第一医院妇产科韩冰

孕28周后S/D比值高于3或者RI>0.6提示预后不良可能性大。

 The utility of this technique before 28 weeks for fetal surveillance in high risk pregnancies remains investigational.

28周前该比值的意义尚有待争论。

An initially high S/D ratio may progressively decline with advancing gestation, signifying an improved prognosis. In contrast, a rising UA DI may indicate worsening fetal prognosis.

如果动态观察S/D比值进行性下降，预示结局改善可能，反之亦然。

The most important diagnostic characteristic of the UA Doppler waveform is the state of the end diastolic velocity. 

相对而言，舒张末期血流意义更为重要

As discussed above, AEDV is an ominous finding and should indicate delivery in pregnancies beyond 34 completed weeks. 

34周后的舒张末期缺如需要终止妊娠。

REDV has an even worse prognosis and should be interpreted as a preterminal finding.

如果是舒张末期逆流则预后更差。

 We feel its presence should indicate immediate delivery as early as 28 weeks of gestation. 

如果孕周超过28周，则应该考虑及时终止。