## Oxytocin Use in Labor Induction: Protocols and Safety **Key Point:** This is an "INCORRECT statement" question. Option A contains an error in the dosing interval — standard oxytocin protocols specify increments every **15–30 minutes**, not every 30–40 minutes. ### Standard Oxytocin Dosing Protocol (per ACOG / Williams Obstetrics) | Parameter | Value | |---|---| | Starting dose | 0.5–2 mIU/min IV infusion | | Increment | 1–2 mIU/min every **15–30 minutes** | | Maximum dose | 20–40 mIU/min | | Route | Intravenous infusion (never bolus) | | Monitoring | Continuous fetal heart rate and uterine contraction monitoring | **High-Yield:** The goal is to achieve 3–5 contractions in 10 minutes, each lasting 40–60 seconds, with adequate uterine relaxation between contractions. The standard increment interval of 15–30 minutes (not 30–40 minutes as stated in Option A) is well-established in Williams Obstetrics (25th ed.) and ACOG Practice Bulletin No. 107. ### Why Option A Is INCORRECT Option A states the infusion is "increased by 1–2 mIU/min every **30–40 minutes**." This is factually wrong. Standard low-dose oxytocin protocols increase the dose every **15–30 minutes**. The 30–40 minute interval is not supported by major obstetric references and would result in suboptimal labor progress. ### Why the Other Options Are CORRECT **Option B — Correct statement:** ARM combined with oxytocin is an accepted and commonly used approach in women with a favorable cervix (Bishop score ≥ 6). When the cervix is favorable, the fetal head is well-applied, and conditions are appropriate, ARM + oxytocin is standard practice and is not contraindicated. **Option C — Correct statement:** Classical (vertical/midline) cesarean section is an **absolute contraindication** to oxytocin-induced labor due to the high risk of uterine rupture along the classical scar. This is well-established in Williams Obstetrics and ACOG guidelines. **Option D — Correct statement:** Uterine hyperstimulation (tachysystole: >5 contractions in 10 minutes) requires **immediate cessation of oxytocin**, left lateral positioning (to relieve aortocaval compression and improve uteroplacental perfusion), oxygen supplementation, and IV fluid bolus. This is standard management per ACOG. **Clinical Pearl (Williams Obstetrics, 25th ed.):** Low-dose oxytocin protocols begin at 0.5–2 mIU/min and are increased by 1–2 mIU/min at intervals of no less than 15 minutes, with most protocols using 15–30 minute intervals. The 30–40 minute interval cited in Option A is inconsistent with standard references.
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