A pregnant woman at 32 weeks gestation has cervical dilation of 6 cm and station -2 (not yet engaged). Which drug is recommended for fetal lung maturity?

Appeared in: NORCET 10 Mains

Explanation

Dexamethasone is a corticosteroid administered to the mother when preterm birth is anticipated between 24 and 34 weeks of gestation.
It crosses the placenta and accelerates the production of surfactant in the fetal lungs.
Surfactant is a substance that keeps the alveoli (air sacs) from collapsing, thereby reducing the risk and severity of Neonatal Respiratory Distress Syndrome (RDS) in the premature infant.

Option B: Oxytocin is a uterine stimulant used to induce or augment labor contractions. Administering it in preterm labor would accelerate delivery, which is the opposite of the desired effect in this scenario.
Option C: Tranexamic acid is an antifibrinolytic agent. Its purpose is to prevent or treat excessive bleeding by stopping blood clots from breaking down. It has no role in fetal lung development.
Option D: Magnesium sulphate does not promote fetal lung maturity. Its primary roles in this context are tocolysis (slowing contractions to allow time for corticosteroids to work) and providing fetal neuroprotection to reduce the risk of cerebral palsy.

Visual 1: Diagram: An illustration showing corticosteroids crossing the placental barrier and acting on fetal lung cells (pneumocytes) to increase surfactant production.
Visual 2: Chart: A summary table of medications used in preterm labor, categorizing them by function (Tocolytics, Corticosteroids, Neuroprotectants, Antibiotics) with examples and key nursing considerations.

Clinical Relevance

Nursing practice connection: Use the key finding related to Pharmacological management of preterm labor to guide bedside assessment, documentation, and the next nursing action.
Administering antenatal corticosteroids is a critical nursing intervention in managing preterm labor. Timely administration can significantly reduce neonatal mortality and morbidity from RDS.
Nurses must monitor the mother for side effects, particularly hyperglycemia, as corticosteroids can raise blood sugar levels.
What if the gestation was 35 weeks? In that case, corticosteroids are generally not routinely recommended. The fetal lungs are considered more mature, and the benefits of the medication may not outweigh potential risks, such as maternal hyperglycemia and neonatal hypoglycemia.

How to Approach the Question

First, identify the core clinical problem from the scenario: a woman is in active preterm labor at 32 weeks.
Next, determine the specific question being asked: which drug promotes fetal lung maturity.
Recall the different classes of drugs used in obstetrics and their primary indications.
Differentiate between drugs that stop labor (tocolytics), drugs that mature the fetus, and drugs that induce labor.
Specifically, remember that corticosteroids (like Dexamethasone and Betamethasone) are the primary agents for accelerating fetal lung maturity.
Eliminate the other options by identifying their main purpose: Oxytocin (induces labor), Tranexamic acid (stops bleeding), and Magnesium sulphate (neuroprotection/tocolysis).

Concept Tested & Keywords

Concept Tested: Pharmacological management of preterm labor
Stem keywords: pregnant woman, 32 weeks gestation, cervical dilation, fetal lung maturity
Lead-in keywords: Which drug is recommended
Clinical cues: The patient is at 32 weeks gestation with signs of active preterm labor (6 cm dilation), making fetal lung maturity a primary concern.

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