A nurse is caring for several clients. The nurse should recognize that it is safe to administer tocolytic therapy to which of the following clients?

Choice A reason: Molar pregnancy is a risk factor for hyperemesis gravidarum, as it is a gestational trophoblastic disease that causes an abnormal growth of the placenta and the production of high levels of human chorionic gonadotropin (hCG), which is a hormone that stimulates nausea and vomiting. Molar pregnancy can cause severe and persistent hyperemesis gravidarum, as well as vaginal bleeding, uterine enlargement, and preeclampsia.

Choice B reason: Previous history of hyperemesis gravidarum is a risk factor for hyperemesis gravidarum, as it suggests a genetic or physiological predisposition to the condition. Hyperemesis gravidarum is a severe form of nausea and vomiting that occurs in pregnancy, and it can cause dehydration, electrolyte imbalance, weight loss, and malnutrition. Hyperemesis gravidarum can recur in subsequent pregnancies, especially if the mother has the same partner, the same sex of the fetus, or a short interval between pregnancies.

Choice C reason: Oligohydramnios is not a risk factor for hyperemesis gravidarum, as it is a low level of amniotic fluid that surrounds the fetus. Oligohydramnios is not related to hyperemesis gravidarum, and it is not a cause or a consequence of it. Oligohydramnios can affect the fetal development and the delivery, as it can cause fetal growth restriction, cord compression, or meconium aspiration.

Choice D reason: Multiple fetal gestation is a risk factor for hyperemesis gravidarum, as it is a condition where the mother is carrying more than one fetus. Multiple fetal gestation can cause higher levels of hCG, estrogen, and progesterone, which are hormones that stimulate nausea and vomiting. Multiple fetal gestation can cause more severe and prolonged hyperemesis gravidarum, as well as preterm labor, anemia, and preeclampsia.

Choice A reason: Providing a dark, quiet environment is an appropriate action for the nurse to implement, because it can help reduce the client's blood pressure and prevent seizures.

Choice B reason: Evaluating neurologic status every 12 hr is not an appropriate action for the nurse to implement, because it is not frequent enough. The nurse should assess the client's neurologic status every 2 to 4 hr, or more often if indicated, to detect signs of cerebral edema or eclampsia.

Choice C reason: Assessing respiratory status every 8 hr is not an appropriate action for the nurse to implement, because it is not frequent enough. The nurse should monitor the client's respiratory status every 1 to 2 hr, or more often if indicated, to detect signs of pulmonary edema or respiratory depression.

Choice D reason: Ensuring that calcium gluconate is readily available is an appropriate action for the nurse to implement, because it is the antidote for magnesium sulfate toxicity. The nurse should have calcium gluconate on hand and know how to administer it in case of an emergency.

Choice E reason: Administering magnesium sulfate IV is an appropriate action for the nurse to implement, because it is the drug of choice for preventing and treating seizures in clients with severe gestational hypertension. The nurse should follow the protocol for magnesium sulfate administration and monitor the client's vital signs, urine output, reflexes, and serum magnesium levels.