A client comes to the emergency room reporting severe abdominal cramping and heavy bleeding at 10 weeks gestation. Cervical examination reveals heavy bleeding, the cervical os is open and tissue is present. Which type of abortion is the client experiencing?

Choice A reason: Placenta previa is a condition where the placenta covers the cervix partially or completely. It can cause painless vaginal bleeding, but not abdominal pain.

Choice B reason: Prolapsed cord is a condition where the umbilical cord slips through the cervix and protrudes into the vagina or beyond. It can cause fetal distress, but not abdominal pain or vaginal bleeding.

Choice C reason: Incompetent cervix is a condition where the cervix dilates prematurely and painlessly. It can cause preterm labor and delivery, but not abdominal pain or vaginal bleeding.

Choice D reason: Abruptio placentae is a condition where the placenta separates from the uterine wall before delivery. It can cause severe abdominal pain, vaginal bleeding, and fetal distress. It is a medical emergency that requires immediate intervention.

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.