A nurse is caring for a newborn who has macrosomia and whose mother has diabetes mellitus. The nurse should recognize which of the following newborn complications as the priority focus of care?

Choice A reason: Misoprostol is not the first line medication for postpartum hemorrhage, as it is a prostaglandin E1 analog that causes uterine contractions and cervical ripening. Misoprostol is used for the prevention and treatment of postpartum hemorrhage, but it is less effective and more side effects than oxytocin, which is the first line medication.

Choice B reason: Pitocin is the first line medication for postpartum hemorrhage, as it is a synthetic form of oxytocin, which is a hormone that stimulates uterine contractions and retraction. Pitocin is used for the induction and augmentation of labor, and the prevention and treatment of postpartum hemorrhage, as it reduces blood loss and enhances hemostasis.

Choice C reason: Hemabate is not the first line medication for postpartum hemorrhage, as it is a prostaglandin F2 alpha analog that causes uterine contractions and vasoconstriction. Hemabate is used for the treatment of postpartum hemorrhage, but it is contraindicated in clients with asthma, hypertension, or cardiac disease, as it can cause bronchospasm, hypertension, or cardiac arrhythmias.

Choice D reason: Methergine is not the first line medication for postpartum hemorrhage, as it is an ergot alkaloid that causes sustained uterine contractions and vasoconstriction. Methergine is used for the treatment of postpartum hemorrhage, but it is contraindicated in clients with hypertension, preeclampsia, or cardiac disease, as it can cause severe hypertension, cerebrovascular accidents, or myocardial infarction.

Choice A reason: To call for an immediate magnesium sulfate level is not the immediate action that the nurse should take, as it is a diagnostic test that requires a blood sample and a laboratory analysis, which can take time and delay the treatment. The nurse should first stop the infusion and notify the provider, as the client is showing signs of magnesium sulfate toxicity, which is a life-threatening condition that can cause respiratory depression, cardiac arrest, or coma.

Choice B reason: To prepare to administer hydralazine is not the immediate action that the nurse should take, as it is a pharmacological intervention that requires a prescription and an assessment of the blood pressure and the fetal status. Hydralazine is an antihypertensive drug that lowers the blood pressure and prevents the complications of severe preeclampsia, such as eclampsia, stroke, or organ damage. However, the client's blood pressure is not very high and is not the main problem at the moment.

Choice C reason: To discontinue the magnesium sulfate infusion is the immediate action that the nurse should take, as it is the first and most important intervention that can reverse the effects of magnesium sulfate and restore the neuromuscular function and the respiratory rate. Magnesium sulfate is a drug that prevents seizures and lowers the blood pressure in clients with severe preeclampsia, but it can also cause toxicity if the dose is too high or the infusion is too fast.

Choice D reason: To administer oxygen is not the immediate action that the nurse should take, as it is a supportive intervention that improves the oxygen delivery to the tissues and organs, but does not address the underlying cause of the respiratory depression, which is the magnesium sulfate toxicity. The nurse should administer oxygen only after stopping the infusion and assessing the oxygen saturation and the respiratory status.