A nurse is assisting the RN who is caring for a client at 36 weeks of gestation who reports vomiting and diarrhea for the past 48 hours. The client reports no amniotic fluid leakage, bleeding, or uterine contractions. The fetal heart rate baseline is 180/min. Which of the following factors should the nurse anticipate the RN identifying as most likely associated with the fetal heart rate pattern?