What is the normal Doppler pattern in the ductus venosus during mid-gestation?

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Multiple Choice

What is the normal Doppler pattern in the ductus venosus during mid-gestation?

In mid-gestation, the ductus venosus Doppler waveform reflects normal venous return and right atrial pressure changes. A healthy pattern shows forward (antegrade) flow during systole and during diastole, and the flow associated with atrial contraction (the a-wave) is also forward. This triphasic forward pattern indicates unobstructed passage of oxygenated blood from the umbilical vein toward the heart and normal fetal hemodynamics. If diastolic flow were reversed or there were absent flow, that would suggest fetal compromise or venous congestion. A pattern with continuous forward flow but an absent a-wave would be abnormal as well, signaling altered atrial dynamics. Therefore, the normal mid-gestation pattern is forward systolic and diastolic flow with a forward a-wave.

In mid-gestation, the ductus venosus Doppler waveform reflects normal venous return and right atrial pressure changes. A healthy pattern shows forward (antegrade) flow during systole and during diastole, and the flow associated with atrial contraction (the a-wave) is also forward. This triphasic forward pattern indicates unobstructed passage of oxygenated blood from the umbilical vein toward the heart and normal fetal hemodynamics.

If diastolic flow were reversed or there were absent flow, that would suggest fetal compromise or venous congestion. A pattern with continuous forward flow but an absent a-wave would be abnormal as well, signaling altered atrial dynamics. Therefore, the normal mid-gestation pattern is forward systolic and diastolic flow with a forward a-wave.

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