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: Hypocalcemia is not the priority focus of care, as it is a low level of calcium in the blood that can cause muscle twitching, seizures, or cardiac arrhythmias. Hypocalcemia can affect newborns who have mothers with diabetes mellitus, but it is less common and less severe than hypoglycemia.

Choice B reason: Hyperbilirubinemia is not the priority focus of care, as it is a high level of bilirubin in the blood that can cause jaundice, a yellowish discoloration of the skin and eyes. Hyperbilirubinemia can affect newborns who have macrosomia, but it is usually a benign and self-limiting condition that resolves within a few days.

Choice C reason: Hypomagnesemia is not the priority focus of care, as it is a low level of magnesium in the blood that can cause tremors, tetany, or seizures. Hypomagnesemia can affect newborns who have mothers with diabetes mellitus, but it is rare and usually asymptomatic.

Choice D reason: Hypoglycemia is the priority focus of care, as it is a low level of glucose in the blood that can cause diaphoresis, jitteriness, lethargy, or apnea. Hypoglycemia can affect newborns who have macrosomia and mothers with diabetes mellitus, as they have increased insulin production and decreased glucose supply after birth. Hypoglycemia can lead to brain damage or death if not treated promptly.

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.