Final answer:
Pitocin is administered to Janine to induce labor, strengthening contractions for a safe delivery at 41 weeks of gestation. The newborn's first breath changes the circulatory pattern by decreasing pulmonary resistance and establishing normal circulation.
Step-by-step explanation:
An IV infusion of pitocin is started for Janine, who is 41 weeks pregnant and experiencing mild and ineffective labor contractions, because it is a synthetic form of oxytocin which is used to augment or induce labor. This intervention aims to strengthen the frequency, duration, and intensity of uterine contractions, helping to progress labor towards delivery. Prolonged gestation raises the risk of complications, so medical intervention is appropriate to facilitate a safe birth.