A 32-year-old multiparous woman at 38 weeks gestation presents to the labor ward with complaints of irregular uterine contractions for 6 hours. On examination, vital signs are stable, abdomen is soft, and fetal heart rate is 140 bpm. Abdominal palpation reveals the fetal head on the left side, buttocks on the right side, and a bony prominence palpable across the midline at the level of the umbilicus. Vaginal examination shows cervix 3 cm dilated, and the examining finger feels a hard, bony structure in the vaginal vault. Ultrasound confirms transverse lie with the fetus in a left occipitoanterior position. What is the most appropriate next step in management?

Explanation

## Management of Transverse Lie in Active Labor **Key Point:** Transverse lie in active labor (cervix ≥3 cm dilated) is an absolute indication for cesarean delivery. ECV is contraindicated once labor has begun. ### Why Cesarean Section Is Mandatory 1. **Active Labor**: The patient is in labor (regular contractions, cervical dilation 3 cm). Once labor is established, the uterus becomes irritable and ECV carries a high risk of uterine rupture, placental abruption, and fetal trauma. 2. **Transverse Lie + Labor = Obstructed Labor**: A transverse lie cannot progress through the pelvis. Continued labor will lead to: - Uterine rupture - Cord prolapse (especially with ruptured membranes) - Fetal distress and death - Maternal hemorrhage and sepsis 3. **Bony Prominence in Vaginal Vault**: The examining finger felt a hard structure — this is likely the fetal shoulder or arm, confirming true transverse lie with impaction. **High-Yield:** Transverse lie in active labor is a **surgical emergency**. Delay increases maternal and fetal morbidity/mortality. ### Transverse Lie: Antepartum vs. Intrapartum Management | Scenario | Management | |---|---| | **Transverse lie at 36–37 weeks, not in labor** | Offer ECV after exclusion of contraindications | | **Transverse lie at term, not in labor** | Admit for observation; offer ECV or plan cesarean at 39 weeks | | **Transverse lie + active labor** | **Cesarean delivery immediately** | | **Transverse lie + ruptured membranes** | **Cesarean delivery immediately** (risk of cord prolapse) | **Clinical Pearl:** Transverse lie complicates 0.3% of term pregnancies but accounts for ~10% of cesarean deliveries for malpresentation. Multiparous women have higher rates due to lax uterine muscles. ### Why Not the Other Options? **Vaginal delivery (Option A):** Impossible with transverse lie. The fetus cannot descend through the pelvis. Attempting vaginal delivery risks uterine rupture and fetal death. **ECV in labor (Option B):** Contraindicated. The uterus is irritable and contracting; ECV in labor carries unacceptable risk of uterine rupture and placental abruption. Additionally, ruptured membranes (if they occur) would make ECV impossible. **Tocolytics and deferral (Option D):** Inappropriate in active labor. While tocolytics might be considered in the antepartum period to allow ECV, they are not a substitute for delivery in established labor with transverse lie. Delaying cesarean increases fetal and maternal risk. **Mnemonic:** **TRANSVERSE = TRANSFER to OR** — Once in labor, transverse lie requires immediate operative delivery.