A 24-year-old G2P1 presents to labor and delivery in latent labor at 37 weeks. Her contractions are every 5-6 minutes, and her cervix is 2 cm/80% effaced/-1 station. She is Group B Strep positive and is receiving penicillin IV for prophylaxis.
Her pregnancy has been complicated by gestational hypertension, and her blood pressure at admission is 140/90 mm Hg. Fetal heart rate (FHR) tracing initially shows a baseline of 140 bpm with moderate variability and accelerations. No decelerations are noted.
She requests medication for pain relief and is given morphine 10 mg IV x 1 dose. Shortly thereafter, the FHR tracing shows decreased variability and very few accelerations.
Which of the following is most likely responsible for the change in FHR tracing?
This question appears in Med-Challenger OBGYN Exam Review with CME
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