A 29-year-old G1P0 woman at 42 weeks gestation presents in labor. She denies ruptured membranes. Her prenatal course was complicated by chronic hypertension. Her vital signs are: blood pressure 130/80; pulse 72; afebrile; fundal height 38 cm; and estimated fetal weight of 3000 gm. Cervix is dilated to 4 cm, 100% effaced, -1 station, and bulging bag of water. The fetal heart rate tracing reveals five contractions in 10 minutes and repetitive late decelerations. What is the most likely cause of her late decelerations?A. Uteroplacental insufficiencyB. Umbilical cord compressionC. Uterine hyperstimulationD. Intrauterine growth restrictionE. Fetal head compression
