PU Doppler Ultrasound in Pregnancy

Question 1

What does absent end-diastolic flow (AEDF) in the umbilical artery indicate?

Accepted Answer

Severely elevated placental resistance with high risk of fetal compromise

Answer

Normal placental function

Answer

Mild IUGR only

Answer

Polyhydramnios

Question 2

What is the S/D ratio in umbilical artery Doppler?

Accepted Answer

The ratio of peak systolic to end-diastolic velocity

Answer

The ratio of systolic to mean velocity

Answer

The ratio of diastolic to systolic velocity

Answer

The pulsatility index

Question 3

Reversed end-diastolic flow (REDF) in the umbilical artery is associated with what outcome?

Accepted Answer

Imminent fetal deterioration requiring urgent delivery consideration

Answer

Mild placental insufficiency

Answer

Normal third-trimester finding

Answer

Maternal hypertension only

Question 4

Which Doppler waveform is used to assess fetal cerebral blood flow?

Accepted Answer

Middle cerebral artery (MCA)

Answer

Anterior cerebral artery

Answer

Posterior cerebral artery

Answer

Circle of Willis

Question 5

What is the brain-sparing effect in Doppler assessment?

Accepted Answer

Increased MCA flow with decreased umbilical artery flow indicating redistribution to protect the brain

Answer

Normal MCA and UA flow

Answer

Decreased MCA flow with normal UA flow

Answer

Equal MCA and UA resistance

Question 6

What does an elevated pulsatility index (PI) in the uterine artery suggest in early pregnancy?

Accepted Answer

Increased risk of preeclampsia and IUGR

Answer

Normal placental development

Answer

Fetal anemia

Answer

Placenta previa