A 28-year-old primigravida from rural Maharashtra presents at 32 weeks gestation with complaints of decreased fetal movements for the past 3 days. On examination, fundal height is 28 cm (less than expected for 32 weeks). Doppler ultrasound shows abdominal circumference (AC) <10th centile for gestational age, estimated fetal weight 1400 g (10th centile), and cerebroplacental ratio (CPR) of 1.2 (normal >1.08). Umbilical artery pulsatility index (PI) is elevated at 1.8 (normal <1.2). What is the most appropriate next step in management?

Explanation

## Clinical Assessment of IUGR **Key Point:** This case presents **asymmetric IUGR with abnormal Doppler parameters** — the combination of reduced AC (<10th centile) with preserved head circumference (implied by normal estimated weight for 32 weeks), elevated umbilical artery PI, and reduced CPR indicates **placental insufficiency requiring intensive monitoring**. ### Doppler Interpretation | Parameter | Finding | Significance | |-----------|---------|-------------| | AC <10th centile | Reduced | Asymmetric IUGR (liver sparing) | | UA PI 1.8 | Elevated | Increased placental resistance | | CPR 1.2 | Borderline low | Abnormal cerebral-placental ratio | | Estimated weight 10th centile | Mild | Not severely growth restricted yet | **High-Yield:** Abnormal umbilical artery Doppler (elevated PI/RI) with reduced CPR in the absence of **reversed end-diastolic flow (REDF)** or **absent end-diastolic flow (AEDF)** indicates **early-stage placental insufficiency** — not yet critical but requiring close surveillance. ### Management Algorithm ```mermaid flowchart TD A[IUGR diagnosed on Doppler]:::outcome --> B{UA Doppler pattern?}:::decision B -->|Normal| C[Reassure, routine follow-up]:::action B -->|Elevated PI/RI, CPR normal| D[Twice-weekly monitoring]:::action B -->|Elevated PI/RI, CPR abnormal| E[Admit for intensive monitoring]:::action B -->|REDF or AEDF| F[Daily monitoring, deliver if deterioration]:::action B -->|Reversed flow in DV| G[Deliver within 24-48 hours]:::urgent D --> H{Deterioration?}:::decision E --> H H -->|Yes| I[Deliver at current gestation]:::action H -->|No| J[Continue monitoring until 37 weeks]:::action ``` ### Why This Patient Needs Admission 1. **Abnormal Doppler + decreased fetal movements** = high risk for acute deterioration 2. **CPR <1.08** = cerebral blood flow redistribution (brain-sparing), a sign of worsening placental insufficiency 3. **At 32 weeks** = prematurity risk significant, but IUGR-related mortality/morbidity outweighs prematurity risk if monitoring shows further deterioration **Clinical Pearl:** In IUGR with abnormal Doppler but no REDF/AEDF, **twice-weekly Doppler + daily cardiotocography (CTG)** allows detection of acute changes (development of REDF, loss of diastolic flow, or abnormal CTG) that mandate delivery. Admission enables this intensive surveillance. **Warning:** Do NOT reassure and defer follow-up — abnormal CPR in a symptomatic patient (decreased movements) is a red flag. Do NOT deliver emergently without evidence of acute fetal distress (such as REDF, AEDF, or pathological CTG) — prematurity at 32 weeks carries significant morbidity. [cite:RCOG Green-top Guideline 31 — The Investigation and Management of the Small-for-Gestational-Age Fetus]