A 28-year-old primigravida at 32 weeks of gestation presents with a fundal height of 29 cm. Ultrasound confirms estimated fetal weight <10th percentile for gestational age with normal amniotic fluid volume and umbilical artery Doppler showing normal end-diastolic flow. Which of the following is NOT a recognized feature or management principle in this case of intrauterine growth restriction?

Explanation

## Diagnosis and Management of IUGR **Key Point:** In true IUGR (intrauterine growth restriction), the underlying etiology is most commonly **placental insufficiency**, not maternal malnutrition. Therefore, maternal nutritional supplementation and bed rest have **NOT** been shown to meaningfully improve fetal weight gain in established IUGR in well-nourished populations. ### Recognized Management Principles in IUGR with Normal Doppler | Aspect | Management | |--------|-------------| | **Ultrasound surveillance** | Every 2 weeks to assess growth velocity and amniotic fluid index | | **Doppler studies** | Umbilical artery (UA), middle cerebral artery (MCA), cerebroplacental ratio (CPR) | | **Delivery timing** | At 37 weeks if growth restriction confirmed with normal Doppler (RCOG/ACOG guidance) | | **Corticosteroids** | Given when preterm delivery is anticipated (<34–36 weeks) OR when Doppler becomes abnormal and early delivery is planned | | **Bed rest / nutritional supplementation** | NOT evidence-based for improving fetal weight in true IUGR | ### Why Option C is the Correct Answer (NOT a recognized management principle) Maternal nutritional supplementation and bed rest are **not** recognized as effective interventions for improving fetal weight gain in true IUGR: 1. **Placental basis of IUGR:** The vast majority of IUGR in developed countries is due to uteroplacental insufficiency, not maternal undernutrition. Supplementing maternal nutrition does not bypass a dysfunctional placenta. 2. **Bed rest:** Multiple RCTs and systematic reviews (Cochrane) have failed to demonstrate benefit of bed rest in IUGR; it may even increase maternal thromboembolic risk. 3. **Nutritional supplementation:** While indicated in malnourished populations, it does not improve fetal growth in placenta-mediated IUGR (Williams Obstetrics 26e, Ch 42). ### Why the Other Options ARE Recognized Principles - **Option A:** Serial ultrasound every 2 weeks is standard surveillance for IUGR with normal Doppler (RCOG Green-top Guideline No. 31). - **Option B:** Antenatal corticosteroids are appropriately withheld when Doppler is normal and no preterm delivery is imminent; they are given when abnormal Doppler signals impending preterm delivery — this reflects correct clinical reasoning. - **Option D:** Delivery at 37 weeks for IUGR with persistently normal Doppler is consistent with RCOG and ACOG recommendations (some guidelines cite 37–38 weeks for uncomplicated IUGR with normal Doppler). **High-Yield:** The single most important concept — bed rest and nutritional supplementation do NOT improve fetal weight in placenta-mediated IUGR. Management is surveillance-based, with timely delivery. **Clinical Pearl:** Do not confuse IUGR management with management of maternal undernutrition. In resource-rich settings, IUGR is a placental problem, not a dietary one. [cite: Williams Obstetrics 26e Ch 42; RCOG Green-top Guideline No. 31 (2013); Cochrane Review: Bed rest in pregnancy]