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Essentials of Fetal Biometry

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Intrauterine Growth Restriction (IUGR)

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1. Which fetal biometric measurement is typically the very first to take a hit when IUGR is developing?
Biparietal Diameter (BPD) Abdominal Circumference (AC) Femur Length (FL)
2. What is the classic hallmark of ASYMMETRIC IUGR that sets it apart from a symmetrical growth restriction?
All growth parameters drop below the 10th percentile simultaneously The head size is preserved while the abdominal circumference drops off The femur stops growing but the abdomen stays normal
3. When evaluating the Umbilical Artery Doppler in severe IUGR, what is the most critical progression pattern indicating worsening placental failure?
Decreased PI to Increased PI High resistance to Absent End-Diastolic flow to Reversed End-Diastolic flow Reversed EDV returning to normal flow
4. You check the Middle Cerebral Artery (MCA) Doppler and notice a significantly decreased Pulsatility Index (PI). What is the fetus doing?
Preparing for spontaneous delivery Vasodilating brain vessels to prioritize blood flow (Brain-sparing effect) Developing an intracranial vascular anomaly