Generally, the uterine artery resistance of normal pregnant women will continuously decrease as the gestational age increases, and both UtA-PI and UtA-RI should show a decreasing trend, and the fetus-placenta circulation will be significantly affected in a negative way when UtA-RI rises substantially.
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Correlation between Parturients' Uterine Artery Blood Flow Spectra in the First and Second Trimesters of Pregnancy and Fetal Growth Restriction.
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