Obstetric Nurse Test Obstetric Nurse Pharmacology in Obstetrics 2

Question 1

A patient with preterm labor at 30 weeks is receiving magnesium sulfate tocolysis. Which finding requires the nurse to withhold the next dose?

Accepted Answer

Respiratory rate of 10 breaths/min

Answer

A respiratory rate below 12 breaths/min indicates magnesium toxicity and the infusion must be stopped immediately.

Question 2

Betamethasone is administered to a pregnant patient at 28 weeks gestation. What is the primary purpose of this medication?

Accepted Answer

Accelerate fetal lung maturity

Answer

Betamethasone stimulates fetal surfactant production to reduce the risk of neonatal respiratory distress syndrome.

Question 3

A patient is receiving IV oxytocin augmentation. Uterine contractions are occurring every 90 seconds. What is the nurse's priority action?

Accepted Answer

Discontinue the oxytocin infusion

Answer

Tachysystole (contractions more frequent than every 2 minutes) requires immediate discontinuation of oxytocin to prevent fetal hypoxia.

Question 4

Which antidote should be immediately available at the bedside of a patient receiving magnesium sulfate?

Accepted Answer

Calcium gluconate

Answer

Calcium gluconate reverses magnesium toxicity by competing with magnesium at neuromuscular junctions.

Question 5

A postpartum patient has received methylergonovine (Methergine) for uterine atony. Which vital sign finding indicates a serious adverse effect?

Accepted Answer

Blood pressure 170/110 mmHg

Answer

Methylergonovine causes vasoconstriction and is contraindicated in hypertension because it can cause severe hypertensive crisis.

Obstetric Nurse Test Practice Test