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Decreased Fetal Movement at 36 Weeks of Gestation

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1. Background and Definitions

• Movements begin as early as 7–8 weeks gestation (detectable on ultrasound) but are perceived by the mother from ~18–20 weeks (primigravida) or ~16–18 weeks (multigravida).
• By 32–36 weeks, movements become well-established — typically 10 or more movements in 2 hours when the fetus is awake.
• At 36 weeks, the fetus is large, has less amniotic fluid relative to body size, and movement character may change (rolling/stretching rather than sharp kicks), but frequency should remain consistent.

• Fewer than 10 movements in 2 hours (Cardiff "count to 10" method)
• Fewer than 3 movements in 1 hour (Sadovsky method)
• A subjective maternal perception of a significant reduction from her usual baseline — this subjective concern alone warrants evaluation regardless of absolute counts

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2. Epidemiology and Clinical Significance

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3. Pathophysiology

1. Central nervous system (cortical and brainstem activity)
2. Neuromuscular pathway (motor neurons, peripheral nerves, neuromuscular junction)
3. Musculoskeletal system
4. Adequate oxygenation and energy substrate delivery

Placental insufficiency
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Reduced O₂/glucose delivery to fetus
        ↓
Fetal brain redistributes blood to vital organs (brain-sparing)
        ↓
Suppression of non-vital activity (movement, breathing) to conserve O₂
        ↓
Decreased fetal movement — a protective but ominous sign

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4. Etiology / Causes

A. Fetal Causes

B. Placental Causes

C. Maternal Causes

D. Physiological Explanation (Reassuring)

• Fetal sleep-wake cycles: quiet sleep state (State 1F) lasts 20–40 min, rarely up to 80–90 min — movement ceases normally
• Anterior placental position: buffers kick perception
• Maternal distraction/activity: can miss movements
• Recent glucose intake: typically increases fetal movement

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5. Clinical Assessment

History

• Onset: When was the last time normal movement was felt?
• Duration of reduced movement: Hours? Days?
• Baseline movement pattern: Has her normal pattern changed?
• Associated symptoms: Vaginal bleeding, abdominal pain, rupture of membranes, leaking
• Maternal medications: Sedatives, opioids, MgSO₄
• Obstetric history: Previous stillbirth, IUGR, pre-eclampsia
• Risk factors: Diabetes, hypertension, smoking, obesity, advanced maternal age
• Fetal kicks in last 2 hours: Count using Cardiff method

Physical Examination

• Vital signs: BP (pre-eclampsia), temperature (infection)
• Fundal height: SFH for dates — lagging may indicate IUGR
• Abdominal palpation: Uterine tenderness (abruption), lie/presentation
• Fetal heart auscultation: Immediate check with Doppler/fetoscope
• Vaginal examination: Only if indicated (avoid if bleeding/placenta previa)

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6. Investigations and Diagnosis

Step 1: Immediate Fetal Heart Rate Auscultation

• Confirm fetal cardiac activity with hand-held Doppler within minutes of presentation
• Normal rate: 110–160 bpm

Step 2: Cardiotocography (CTG) / Non-Stress Test (NST)

Step 3: Biophysical Profile (BPP)

Step 4: Ultrasound Assessment

• Estimated fetal weight (EFW): Biometry — BPD, HC, AC, FL to check for IUGR
• Amniotic fluid index (AFI): Oligohydramnios (AFI <5 cm) = adverse outcome marker
• Placental assessment: Grading, retroplacental clot (abruption), location
• Fetal anatomy: Structural anomalies
• Umbilical artery Doppler: Key test for IUGR/placental insufficiency

Step 5: Umbilical Artery Doppler (Especially if IUGR Suspected)

Step 6: Additional Investigations

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7. Differential Diagnosis

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8. Management

Algorithm Overview

DFM reported at 36 weeks
        ↓
Immediate Doppler auscultation of FHR
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Reassuring → CTG (NST)
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Reactive CTG → USS + BPP
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     Normal BPP (8–10)          Abnormal BPP / Non-reactive CTG
          ↓                               ↓
  Reassure + counsel              Umbilical artery Doppler
  Consider further assessment          +
  if risk factors present         Additional investigations
          ↓                               ↓
  Outpatient follow-up          Deliver / intensify monitoring

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A. Reassuring Assessment (Reactive CTG + Normal BPP)

1. Reassure the patient — explain findings in clear, non-dismissive language
2. Counsel on fetal movement awareness — advise her to continue monitoring; return immediately if DFM recurs
3. Do NOT dismiss recurrent episodes — repeated DFM with reassuring tests still warrants senior review and closer surveillance
4. Consider growth scan if not done recently (within 2–3 weeks at 36 weeks)
5. Check risk factors: if present (diabetes, hypertension, previous stillbirth, IUGR), arrange closer surveillance even with reassuring results

B. Non-Reassuring Assessment

If CTG Non-Reactive or BPP ≤ 6:

1. Admit to hospital
2. Expedite assessment: urgent USS with Doppler
3. Discuss with senior obstetrician / consultant immediately
4. Multidisciplinary team involvement: obstetrician, neonatology, midwifery

Timing of Delivery Based on Findings:

C. Mode of Delivery

• Induction of labour (IOL) — preferred at 36 weeks if cervix favorable and fetal condition not immediately critical
  • Bishop score assessment
  • Cervical ripening with prostaglandins (dinoprostone) or balloon catheter if unfavorable
  • Augmentation with oxytocin as needed
  • Continuous intrapartum CTG monitoring is mandatory given the DFM history
• Emergency cesarean section (Cat 1 LSCS) — indicated for:
  • Acute fetal compromise on CTG (prolonged decelerations, sinusoidal pattern)
  • REDF on Doppler
  • Abruption with fetal compromise
  • Malpresentation preventing safe vaginal delivery
  • Failed induction with deteriorating fetal condition

D. Intrapartum Management (if proceeding to labour)

• Continuous electronic fetal monitoring (EFM/CTG) throughout labour — mandatory
• Avoid epidural hypotension — can worsen uteroplacental perfusion
• Lower threshold for operative delivery — forceps/ventouse or LSCS if CTG becomes pathological
• Fetal blood sampling (FBS) if CTG equivocal — pH >7.25 = reassuring; pH <7.20 = deliver
• Cord blood gases at delivery
• Neonatal team (NICU/SCBU) standby at delivery

E. Feto-Maternal Hemorrhage (FMH)

• If Kleihauer-Betke test positive (significant FMH), this is a cause of sudden DFM/stillbirth
• If Rh-negative mother: give anti-D immunoglobulin (calculated dose based on FMH volume)
• FMH >30 mL: associated with fetal anemia and acute hydrops — urgent delivery

F. Specific Conditions

• Intensify surveillance: twice-weekly CTG + weekly/biweekly Doppler
• Delivery timing based on gestational age + Doppler findings (RCOG/ACOG guidelines)
• Antenatal corticosteroids if <34 weeks or if prematurity is anticipated
• At 36 weeks with IUGR + DFM: delivery is generally indicated

• Strict glycemic control
• High risk of stillbirth — low threshold for delivery
• ACOG recommends delivery by 38–39 weeks in well-controlled GDM; earlier if poor control or DFM

• Delivery is the definitive treatment for pre-eclampsia at ≥36 weeks
• DFM in this context accelerates the decision to deliver

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9. Patient Counseling

1. Validate her concern — DFM is never trivial; she was right to present
2. Explain the assessment process clearly
3. Fetal kick counting education:
   • Count kicks after meals when fetus is typically active
   • Use Cardiff "count to 10" — aim for 10 movements in 2 hours
   • Return immediately if <10 movements in 2 hours or if she senses a significant decrease from her normal pattern
4. No evidence that kick counting charts alone reduce stillbirth — but awareness and prompt presentation do
5. Do not use home dopplers as a substitute for assessment — false reassurance is dangerous
6. Avoid smoking, alcohol, and sedating medications

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10. Prognosis and Follow-up

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11. Key Guidelines Referenced

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Summary Table

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