A nurse is admitting a client who is at 30 weeks of gestation and is in preterm labor. The client has a new order for betamethasone and asks the nurse about the purpose of this medication. The nurse should provide which of the following explanations?

Choice A reason: Monitoring the newborn's blood pressure is not the most appropriate action, as it is not directly related to the signs of diaphoresis, jitteriness, and lethargy. These signs are more indicative of hypoglycemia, which is a low blood sugar level that can affect newborns, especially those who are premature, small for gestational age, or have diabetic mothers.

Choice B reason: Initiating phototherapy is not the most appropriate action, as it is used to treat hyperbilirubinemia, which is a high level of bilirubin in the blood that can cause jaundice, a yellowish discoloration of the skin and eyes. Hyperbilirubinemia does not cause diaphoresis, jitteriness, or lethargy.

Choice C reason: Obtaining blood glucose by heel stick is the most appropriate action, as it can confirm the diagnosis of hypoglycemia, which is the most likely cause of the signs of diaphoresis, jitteriness, and lethargy. The nurse should perform a heel stick using a sterile lancet and a glucose meter, and obtain a blood sample from the lateral aspect of the heel. The nurse should also provide warmth, stimulation, and feeding to the newborn, and report the blood glucose level to the provider.

Choice D reason: Placing the newborn in a radiant warmer is not the most appropriate action, as it can cause dehydration, fluid loss, and further hypoglycemia. The nurse should use a radiant warmer only if the newborn is hypothermic, which is a low body temperature that can also affect newborns. The nurse should monitor the newborn's temperature and skin color, and adjust the warmer accordingly.

Choice A reason: Blunt force trauma is a possible risk factor for placental abruption, which is a condition where the placenta detaches from the uterine wall and causes bleeding, pain, and fetal distress. However, blunt force trauma is not the most common risk factor, as it accounts for only a small percentage of cases. The most common causes of blunt force trauma are motor vehicle accidents, falls, or domestic violence.

Choice B reason: Hypertension is the most common risk factor for placental abruption, as it affects about 50% of cases. Hypertension can cause vasospasm and reduced blood flow to the placenta, which can weaken the attachment and lead to separation. Hypertension can be chronic, gestational, or related to preeclampsia.

Choice C reason: Gestational diabetes mellitus is not a risk factor for placental abruption, but rather a condition where the client develops high blood sugar levels during pregnancy and can cause complications, such as macrosomia, polyhydramnios, or neonatal hypoglycemia. Gestational diabetes mellitus does not affect the placental attachment or function.

Choice D reason: Cigarette smoking is a risk factor for placental abruption, as it can cause vasoconstriction and reduced oxygen delivery to the placenta, which can impair its growth and development. However, cigarette smoking is not the most common risk factor, as it affects about 25% of cases.