A nurse is caring for a client who is 5 hr postpartum following a vaginal birth of a newborn weighing 11 lb 6 oz. (5160 g). The nurse should recognize that this client is at risk for which of the following postpartum complications?

Choice A reason: Elevated blood pressure is a hallmark sign of preeclampsia, which is a hypertensive disorder of pregnancy that can cause serious complications, such as eclampsia, HELLP syndrome, or placental abruption. The nurse should monitor the client's blood pressure regularly and report any readings above 140/90 mm Hg to the provider.

Choice B reason: Increased urine output is not a sign of preeclampsia, but rather a normal physiological change of pregnancy, as the renal blood flow and glomerular filtration rate increase. A client with preeclampsia may have decreased urine output, which can indicate renal impairment or oligohydramnios.

Choice C reason: Joint pain is not a sign of preeclampsia, but rather a common discomfort of pregnancy, as the hormones relaxin and progesterone loosen the ligaments and joints. A client with preeclampsia may have epigastric pain, which can indicate liver involvement or impending eclampsia.

Choice D reason: Vaginal discharge is not a sign of preeclampsia, but rather a normal occurrence of pregnancy, as the cervical glands secrete more mucus to protect the uterus from infection. A client with preeclampsia may have vaginal bleeding, which can indicate placental abruption or disseminated intravascular coagulation.

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.