Final answer:
The priority nursing action for uterine atony and potential PP hemorrhage is to assess vital signs and uterine tone to prevent significant blood loss. Involution and intact delivery of the placenta are critical to prevent PP hemorrhage. If needed, interventions such as Pitocin can be utilized.
Step-by-step explanation:
When addressing the situation of uterine atony and potential postpartum hemorrhage (PP hemorrhage), the priority nursing action is B. Assess the vital signs and uterine tone. This is because immediate assessment and action are required to prevent significant blood loss and other complications. Pain medication administration is secondary to assessing and stabilizing the patient's condition. Education on postpartum care is important but not a priority in an emergency situation. Preparation for cesarean section is not relevant post-delivery unless it pertains to other complications not resolved by the delivery of the baby. During the three stages of labor, involution occurs after the delivery of the baby, where uterine contractions help return the uterus to its pre-pregnancy size and allow for the return of the mother's abdominal organs to their normal positions. The importance of intact expulsion of the placenta is crucial to prevent PP hemorrhage, and interventions like Pitocin may be needed to manage labor or promote uterine contraction post-delivery.