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First trimester screening for cardiac defects based on the ductus venosus flow is more effective if the a/S or a/D ratio is used compared to the Pulsatility index for veins.

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This page is a summary of: First‐trimester ductus venosus velocity ratio as a marker of major cardiac defects, Ultrasound in Obstetrics and Gynecology, May 2019, Wiley,
DOI: 10.1002/uog.20099.
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