Fetal Ductus Venosus Doppler Ultrasound Interpretation

The Ductus Venosus Ultrasound is a specific ultrasound, which measures the velocity of blood flow through ductus venosus. The abnormal Ductus Venosus Doppler show either Decreased or Reversed A-wave.
The ductus venosus allows oxygenated and nutrient rich venous blood to flow from the placenta to the myocardium and brain. Increased impedance to flow in the fetal ductus venosus is associated with certain abnormalities like fetal aneuploidies, cardiac defects and other ad-verse pregnancy outcomes. So Ductus Venosus Doppler is a useful tool to detect these abnormalities.
The typical Doppler flow waveform of the ductus venosus shows the continuous flow of the triphasic forward throughout the cardiac cycle with a highest peak during the systole represented by S-WAVE, another one peak is during the diastolic filling represented by D wave, and the third wave is A wave which represents the atrial contraction.
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