A primipara client at 42 weeks gestation is admitted for induction. Within one hour after initiating an oxytocin infusion, her cervix is 100% effaced and 6 cm dilated, contractions are occurring every 1 minute with a 75-second duration. The nurse stops the oxytocin and starts oxygen. After 30 minutes of uterine rest, the contractions are occurring every 5 minutes with 20-second duration. Which intervention should the nurse implement?