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O&G SAQsAntenatal care — fetal surveillance

O&G SAQs · Antenatal care — fetal surveillance

Decreased fetal movements — structured SAQ (15 marks)

FRANZCOG-format structured SAQ on recurrent DFM with fetal growth restriction and an abnormal CTG: first-ten-minute priorities, why a reassuring CTG does not close the file, the investigation bundle with thresholds, and management that integrates the negative AFFIRM and My Baby's Movements trials. Per-sub-part marking rubric included.

15 marks20 min3 min readVerification in progress

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FRANZCOGMRCOGABOG
Prompt
You are the obstetric registrar on the antenatal ward. A 33-year-old G2P1 smoker at 37 weeks gestation presents for the second time in eight days reporting that her baby is not moving as much as usual. Her first presentation five days ago was discharged after a reactive CTG. Today her CTG shows a baseline of 145 bpm with reduced variability and two late decelerations. Her fundal height is 34 cm (expected 37 cm). (a) State your immediate priorities in the first ten minutes. (4 marks) (b) Explain why a reactive CTG at her first presentation did not exclude fetal compromise, and what additional assessment was required. (3 marks) (c) Outline your investigations and their thresholds for abnormality. (4 marks) (d) Outline your management, including the role of awareness trials in informing the counselling. (4 marks)

How this SAQ is marked

Twelve SAQs, 180 marks, two 2-hour papers — roughly 15 marks and 20 minutes each. Marks come from specifics: named thresholds, named trials, the reasoning that links a reassuring CTG to the need for growth and Doppler. Write in short labelled points. Answer the sub-part you are asked. [2][3]

Reveal model answer and mark schemeShowHide

(a) Immediate priorities — first ten minutes (4 marks)

One mark per point, maximum four. [3][4]

  • Confirm fetal viability with handheld Doppler or ultrasound at the bedside; do not proceed without confirming the baby is alive.
  • Continuous CTG and interpretation: this trace is abnormal (reduced variability and recurrent late decelerations) and signals fetal compromise.
  • Call for help — senior obstetrician, midwifery coordinator, theatre and anaesthetics alert; this is a fetus at risk and a recurrent presentation.
  • Focused history and examination — recurrent DFM (second presentation in eight days), smoking, fundal height 34 cm at 37 weeks (small for dates), maternal observations to exclude pre-eclampsia and abruption.

Reasoning mark for stating that this is a compromised fetus with an abnormal CTG in the context of recurrent DFM and suspected fetal growth restriction.

(b) Why a reactive CTG at the first presentation did not exclude compromise (3 marks)

One mark per point. [4][5]

  • The CTG reflects only the next twenty minutes of fetal oxygenation, not placental function over days to weeks; a reactive trace does not exclude a failing placenta.
  • Recurrent DFM up-tiers the risk — the Lu IPD meta-analysis shows recurrent DFM clusters with fetal growth restriction and placental insufficiency, and abnormal fetal heart rate carries an adjusted OR of 3.65 for adverse outcome.[3]
  • At the first presentation, growth on customised charts, amniotic fluid volume and umbilical artery Doppler were required in addition to the CTG, because fetal growth restriction and placental insufficiency are the most common underlying pathology (FGR was the most common complication in the Lu IPD meta-analysis at 4.6%).[3]

(c) Investigations and thresholds for abnormality (4 marks)

One mark per investigation with threshold. Marks are lost for omitting customised growth or Doppler. [4][5]

InvestigationThreshold for abnormality
CTGBaseline outside 110 to 160 bpm, reduced variability below 5 bpm, recurrent decelerations, sinusoidal pattern
Ultrasound biometry on customised chartsEstimated fetal weight or abdominal circumference below the 10th centile
Amniotic fluid volumeDeepest vertical pool below 2 cm, or amniotic fluid index below 5 cm (oligohydramnios)
Umbilical artery DopplerPulsatility index above the 95th centile, or absent or reversed end-diastolic flow
Cerebroplacental ratioBelow the 5th centile (brain-sparing)
[4][5]

(d) Management and the role of the awareness trials (4 marks)

One mark per element. [1][3]

  • This fetus is compromised: an abnormal CTG with recurrent DFM and suspected growth restriction warrants urgent obstetric review and expedited birth, likely by caesarean given the gestation and the abnormal trace, after senior consultation and counselling of the woman.[3]
  • Recurrent DFM mandates a senior decision, not a repeat reassuring CTG and discharge; a third presentation is a near-mandate for a decision about birth.
  • Counselling integrates the awareness evidence: the AFFIRM trial (Norman, Lancet 2018) showed that an awareness and standardised-management care package did NOT reduce stillbirth (4.40 vs 4.06 per 1000, aOR 0.90, 0.75 to 1.07); however, the Thompson IPD meta-analysis confirms the association between DFM and stillbirth is real (reduced frequency aOR 2.33).[1][2]
  • Document the assessment, findings, counselling and plan, give written advice, and feed into the Safer Baby Bundle quality-improvement pathway (DFM is one of the five elements).[6]
Obstetrics & Gynaecology Pro

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You have read the opening of this SAQ. The complete unit — every section and its primary-source references — is part of the Obstetrics & Gynaecology fellowship library.

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References6ShowHide
  1. [1]Norman JE, Heazell AEP, Rodriguez A, et al. Awareness of fetal movements and care package to reduce fetal mortality (AFFIRM): a stepped wedge, cluster-randomised trial Lancet, 2018.PMID 30269876
  2. [2]Thompson JMD, Wilson J, Bradford BF, et al. A better understanding of the association between maternal perception of foetal movements and late stillbirth: findings from an individual participant data meta-analysis BMC Med, 2021.PMID 34775977
  3. [3]Lu Y, Palin V, Heazell A Risk factors for adverse pregnancy outcomes in reduced fetal movement: an IPD meta-analysis BJOG, 2025.PMID 40091517
  4. [4]Dutton PJ, Warrander LK, Roberts SA, et al. Predictors of poor perinatal outcome following maternal perception of reduced fetal movements: a prospective cohort study PLoS One, 2012.PMID 22808059
  5. [5]Butler E, Hugh O, Gardosi J Evaluating the Growth Assessment Protocol for stillbirth prevention: progress and challenges J Perinat Med, 2022.PMID 35618671
  6. [6]Andrews C, Boyle FM, Pade A, et al. Experiences of antenatal care practices to reduce stillbirth: surveys of women and healthcare professionals pre-post implementation of the Safer Baby Bundle BMC Pregnancy Childbirth, 2024.PMID 39090562
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