A 28-year-old multigravida at 36 weeks of gestation is found to have transverse lie on routine ultrasound. She is asymptomatic with no vaginal bleeding or contractions. Amniotic fluid volume is normal, and there is no evidence of placental abnormality. What is the most appropriate next step in management?

Explanation

## Management of Transverse Lie at Term **Key Point:** Transverse lie is a malpresentation where the long axis of the fetus is perpendicular to the long axis of the uterus. It occurs in ~0.3% of term pregnancies and is incompatible with vaginal delivery. ECV is the first-line intervention to convert to cephalic presentation. ### Etiology of Transverse Lie **High-Yield:** Risk factors include: - Multiparity (lax uterus) — **most common** - Placenta previa - Uterine fibroids - Fetal anomalies - Multiple gestation - Polyhydramnios ### Management Algorithm for Transverse Lie at 36+ Weeks ```mermaid flowchart TD A[Transverse lie at 36+ weeks]:::outcome --> B{Acute emergency?}:::decision B -->|Yes: cord prolapse, ROM, labor| C[Cesarean section]:::urgent B -->|No: stable, intact membranes| D[Offer ECV]:::action D --> E{ECV successful?}:::decision E -->|Yes| F[Plan vaginal cephalic delivery]:::action E -->|No or declined| G[Plan cesarean at 39 weeks]:::action D --> H{Contraindications to ECV?}:::decision H -->|Yes| G H -->|No| D ``` ### ECV Success Rates & Timing | Factor | Success Rate | |--------|---------------| | **Multipara, transverse lie** | 60–70% | | **Primigravida, transverse lie** | 40–50% | | **Optimal timing** | 36–37 weeks (before engagement) | | **After failed ECV** | Repeat attempt at 39 weeks may be considered | **Clinical Pearl:** This patient is a multiparous woman at 36 weeks with transverse lie — ideal candidate for ECV. Multiparity is associated with higher success rates because the uterus is more lax and the fetus is more mobile. ### Why ECV Is First-Line 1. **Success converts to cephalic** — lowest perinatal morbidity 2. **Avoids unnecessary cesarean** — reduces maternal morbidity (infection, hemorrhage, thromboembolism) 3. **Cost-effective** — one procedure vs. planned cesarean 4. **Timing is critical** — at 36 weeks, fetus is still mobile; by 39 weeks, engagement may limit success **Mnemonic:** **TLie-ECV-Plan** - **T**ransverse **Lie** → **E**xternal **C**ephalic **V**ersion - **E**CV success → vaginal cephalic (safest) - **C**esarean if **V**ersion fails or contraindicated