PIRI and S/D of fetal artery were found to become low when the pregnant days increased in normal pregnancy.

 
  • 發現正常妊娠時胎兒臍動脈的搏動指數、阻力指數、收縮期最高峰值血流速度/舒張末期最低血流速度比值隨孕齡的增加而下降;
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