结论：脐动脉的PI不仅反映了阻力的变化，而且间接受阻抗的影响； PI直接反映了R／Z比值。
Conclusion:Not only R but Z of umbilical artery affected with PI of waveforms, PI of umbilical artery was directly associated with the R/Z.
结论：脐动脉的PI不仅反映了阻力的变化，而且间接受阻抗的影响； PI直接反映了R／Z比值。
Conclusion:Not only R but Z of umbilical artery affected with PI of waveforms, PI of umbilical artery was directly associated with the R/Z.
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