A nurse is caring for a client who is at 22 weeks of gestation and has been unable to control her gestational diabetes mellitus with diet and exercise. The nurse should anticipate a prescription from the provider for which of the following medications for the client?

Choice A reason: This statement is correct, as betamethasone is a corticosteroid that is given to pregnant women who are at risk of delivering before 34 weeks of gestation. Betamethasone stimulates the production of surfactant, which is a substance that prevents the alveoli from collapsing and improves the lung function of the fetus.

Choice B reason: This statement is incorrect, as betamethasone does not affect the cervical dilation, which is a sign of labor progression. Betamethasone does not stop or delay labor, but rather reduces the complications of prematurity, such as respiratory distress syndrome, intraventricular hemorrhage, or necrotizing enterocolitis.

Choice C reason: This statement is incorrect, as betamethasone does not increase the fetal heart rate, which is a measure of fetal well-being. Betamethasone may cause transient fetal bradycardia, which is a decrease in the fetal heart rate, due to the increased vagal tone and blood pressure. The nurse should monitor the fetal heart rate and notify the provider if there are any signs of fetal distress.

Choice D reason: This statement is incorrect, as betamethasone is not used to stop preterm labor contractions, which are caused by the uterine muscle activity. Betamethasone does not have any tocolytic effect, which is the ability to inhibit uterine contractions. Other medications, such as magnesium sulfate, nifedipine, or indomethacin, may be used to stop preterm labor contractions.

Choice A reason: Increased subcutaneous fat is not a typical finding in a newborn who was born at 42.5 weeks of gestation, because it is more characteristic of a term or preterm newborn. A postterm newborn tends to have less subcutaneous fat, and may appear thin and wasted.

Choice B reason: Dry, cracked skin is a common finding in a newborn who was born at 42.5 weeks of gestation, because the skin has been exposed to the amniotic fluid for a prolonged period. The skin may also appear peeling, wrinkled, or leathery.

Choice C reason: Scant scalp hair is not a usual finding in a newborn who was born at 42.5 weeks of gestation, because it is more characteristic of a preterm newborn. A postterm newborn tends to have more scalp hair, and may also have long nails and abundant lanugo.

Choice D reason: Copious vernix is not a specific finding in a newborn who was born at 42.5 weeks of gestation, because it is more characteristic of a term or preterm newborn. A postterm newborn tends to have little or no vernix, which is a white, cheesy substance that protects the skin in utero.