Video case: in the first trimester the ductus venosus can be easily identified with color Doppler and a ductus venosus waveform canbe obtained by pulsed Doppler. At 11–13 weeks the prevalence of abnormal a-wave in the ductus venosus is inversely related to fetal crown-rump length and maternal serumpregnancy-associated plasma protein-A (PAPP-A), increaseswith fetal nuchal translucency (NT) thickness and is morecommon in women of Black racial origin and in fetuses with abnormal karyotype or cardiac defects.
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