A primigravida client at 36-weeks gestation is admitted to the labor and delivery unit because her membranes ruptured 30 minutes ago. Initial assessment indicates a 2 cm cervical dilatation, 50% effaced, -2 station, vertex presentation, greenish-colored amniotic fluid, and contractions occurring every 3 to 5 minutes, with a decrease in fetal heart rate after the last four contraction peaks. Which action should the nurse implement first?
a) Notify the healthcare provider.
b) Administer oxygen via face mask.
c) Apply an internal fetal heart monitor.
d) Use a vibroacoustic stimulator.
