A nurse is caring for a client who is receiving magnesium sulfate for pre-term labor.

Which of the following assessments should the nurse perform to evaluate the therapeutic effect of the medication?

Nifedipine is a calcium channel blocker that is used to relax uterine contractions and postpone preterm labor.However, it can also lower blood pressure and cause side effects such as headache, dizziness, flushing, and palpitations.Therefore, it should be avoided in clients who have cardiac disease or other conditions that affect the heart function.

Choice A is wrong because asthma is not a contraindication for nifedipine.Nifedipine does not affect the airways or cause bronchospasm.

Choice B is wrong because diabetes mellitus is not a contraindication for nifedipine.Nifedipine does not affect blood glucose levels or insulin secretion.

Choice C is wrong because hypertension is not a contraindication for nifedipine.In fact, nifedipine can be used to treat high blood pressure as well as preterm labor.However, blood pressure should be monitored closely during nifedipine therapy to avoid hypotension.

Betamethasone is a corticosteroid that is given to pregnant women who are at risk of preterm delivery to enhance fetal lung maturity.Betamethasone stimulates the production of surfactant, a substance that lubricates the lungs and prevents them from collapsing when the baby breathes.This reduces the risk of respiratory distress syndrome and other complications in preterm infants.

Choice A is wrong because betamethasone does not reduce inflammation in the uterus.

Choice C is wrong because betamethasone does not prevent infection in the amniotic fluid.

Choice D is wrong because betamethasone does not increase blood flow to the placenta.

Normal ranges for gestational age are 37 to 42 weeks.

Preterm birth is defined as delivery before 37 weeks of gestation.Antenatal corticosteroids are recommended for women between 24 and 34 weeks of gestation who are at risk of preterm delivery within 7 days, and may be considered for women at 23 weeks of gestation or between 34 and 37 weeks of gestation depending on the clinical scenario.