A 38-year-old primigravida at 39 weeks gestation presents for induction of labor due to gestational diabetes. On examination, the cervix is 2 cm dilated, 50% effaced, firm consistency, and the fetal head is at −2 station. The Bishop score is calculated as 6. Fetal heart rate is 140 bpm with normal variability. What is the most appropriate next step in management?

Explanation

## Clinical Assessment The patient has an **unfavorable cervix** with a Bishop score of 6 (score <8 indicates unfavorable cervix). In the setting of an unfavorable cervix, cervical ripening is the standard of care before attempting oxytocin-induced labor. ## Bishop Score Interpretation | Bishop Score | Cervical Status | Management | |---|---|---| | ≥8 | Favorable | Proceed with oxytocin induction | | <8 | Unfavorable | Cervical ripening required | **Key Point:** A Bishop score of 6 indicates an unfavorable cervix (firm, closed, posterior position, minimal effacement). Attempting oxytocin induction in this scenario has a high failure rate (up to 50%) and increases the risk of uterine tachysystole and fetal compromise. ## Cervical Ripening Options 1. **Misoprostol (PGE₁ analogue)**: 25 mcg vaginally every 3–6 hours (max 4 doses/24 hours) - Cost-effective, stable at room temperature - Contraindicated in prior uterine scar (relative) 2. **Dinoprostone (PGE₂)**: 0.5 mg intracervically every 6 hours (max 3 doses/24 hours) - Requires refrigeration - Higher cost 3. **Mechanical methods**: Foley catheter balloon (80 mL) or double-balloon catheter - Preferred in prior cesarean section - Lower risk of uterine tachysystole **High-Yield:** After cervical ripening (typically 12–24 hours), reassess Bishop score. If favorable (≥8), proceed with oxytocin. If still unfavorable, consider repeat ripening or cesarean delivery. ## Why Not Immediate Oxytocin? **Clinical Pearl:** Oxytocin induction in an unfavorable cervix is associated with: - High failure-to-progress rates - Increased uterine hyperstimulation - Fetal hypoxia and decelerations - Higher cesarean delivery rates This is a **primigravida** (first pregnancy), which further reduces the likelihood of successful vaginal delivery with an unfavorable cervix. ## Why Not Cesarean Section? Cesarean delivery is not indicated as a first-line intervention for an unfavorable cervix in a patient with a valid indication for induction (gestational diabetes). Cervical ripening should be attempted first.