Final answer:
The initial step in the management of a pregnant patient with contractions and ruptured membranes is to assess the fetal well-being, particularly the fetal heart rate tracing.
Step-by-step explanation:
The initial step in the management of a 29-year-old g1 p0 woman at 40 weeks gestation who presents to labor and delivery with contractions and ruptured membranes is to assess the fetal well-being. In this case, the fetal heart rate tracing has minimal variability and no accelerations. These signs suggest fetal compromise and require further evaluation. Therefore, the initial step in the management of this patient would be to perform a fetal heart rate monitoring and assess the fetal well-being.