As a woman enters the second stage of labor, her membranes spontaneously rupture. What action should the nurse take?

A) Check fetal heart rate: The first priority when a woman's membranes spontaneously rupture is to assess fetal well-being. The nurse should immediately check the fetal heart rate (FHR) after the rupture of membranes to evaluate for any signs of fetal distress. If there are any concerns regarding the FHR, further interventions may be needed, such as adjusting the maternal position or preparing for a possible emergent delivery. Monitoring the FHR will help guide subsequent decisions regarding care. B) Instruct her to bear down with the next contraction: While the second stage of labor involves pushing, it is important to wait for the appropriate signs of readiness before instructing the mother to bear down. The nurse should ensure the cervix is fully dilated and that fetal descent is progressing appropriately. Rushing into pushing too early or without proper readiness can lead to maternal and fetal complications. C) Place her legs in stirrups: Placing the mother’s legs in stirrups is typically done once she is in the active phase of pushing (typically when the cervix is fully dilated and fetal descent is ready). It is not the first priority immediately after the membranes rupture. The nurse should first assess the fetal heart rate and ensure the woman is comfortable and ready to push before assuming the lithotomy position or placing her legs in stirrups. D) Test a sample of the amniotic fluid for meconium: Testing the amniotic fluid for meconium should be done if there is concern that the amniotic fluid may be stained, as meconium in the amniotic fluid can be a sign of fetal distress. However, the first action after the membranes rupture is to check the fetal heart rate. If the FHR is normal, further actions, like testing the fluid, may follow, but the priority remains assessing fetal well-being.