Soru

A 34-year-old woman, gravida 4, para 3, is evaluated in the obstetrical triage unit at 37 weeks and 4 days gestation. She complains of a sudden onset of severe, unremitting lower abdominal and back pain that started 90 minutes ago. The patient reports normal fetal movement earlier in the day but denies any vaginal bleeding, leakage of fluid, or recent trauma. Her prenatal course was notable only for mild diet-controlled gestational diabetes. Her temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $112/68\text{ mm Hg}$, and pulse is $118\text{/min}$. On physical examination, the uterus is extremely firm, rigid, and exquisitely tender to light palpation. Pelvic examination reveals a long, closed, and posterior cervix with no visible blood in the vaginal vault. Initial laboratory studies demonstrate a hemoglobin of $10.6\text{ g/dL}$ and a platelet count of $152,000/\text{mm}^3$. Tocodynamometry shows high-frequency, low-amplitude uterine contractions occurring every 1 to 2 minutes with a persistently elevated resting tone. Fetal heart rate monitoring reveals a baseline of $105\text{/min}$, absent variability, and recurrent late decelerations. Which of the following is the most appropriate next step in management?