Which of the following is NOT true regarding meconium aspiration syndrome?

AIIMS BBSR SNO - 2019

Child Health Nursing (Pediatrics)

Easy

Appeared in: AIIMS BBSR SNO - 2019

Explanation

The statement is false because severe Meconium Aspiration Syndrome (MAS) is a well-established and significant risk factor for developing Persistent Pulmonary Hypertension of the Newborn (PPHN).
The pathophysiology involves aspiration of meconium leading to chemical pneumonitis, mechanical airway obstruction, and surfactant inactivation.
These events cause profound hypoxia, which in turn triggers intense pulmonary vasoconstriction, preventing the normal decrease in pulmonary vascular resistance after birth and resulting in PPHN.

Option A: This statement is true. MAS is a significant and common cause of respiratory distress in newborns, especially those born at term or post-term.
Option B: This statement is true. It correctly describes the fundamental mechanism of MAS, which is the inhalation of meconium mixed with amniotic fluid into the fetal or neonatal lungs.
Option D: This statement is true. The typical radiographic findings on a chest X-ray for an infant with MAS are described as patchy or 'fluffy' infiltrates, coarse streaking, and areas of atelectasis mixed with hyperinflation.

Clinical Relevance

Nursing practice connection: Knowing Meconium Aspiration Syndrome (MAS) pathophysiology and complications helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must closely monitor any newborn delivered through meconium-stained amniotic fluid for signs of respiratory distress (tachypnea, grunting, retractions, cyanosis), as this is the hallmark of MAS.
A critical nursing responsibility is to assess for signs of PPHN, such as profound cyanosis that responds poorly to oxygen therapy, and to report these findings immediately for urgent intervention.
What if? If the newborn was premature (e.g., 32 weeks), the primary cause of respiratory distress would more likely be Respiratory Distress Syndrome (RDS) due to surfactant deficiency. Meconium passage is rare in preterm infants, making MAS a less likely diagnosis.

How to Approach the Question

First, identify that this is a negatively framed question, asking for the statement that is 'NOT true'. This means three of the options are correct facts about Meconium Aspiration Syndrome (MAS), and one is false.
Evaluate each option based on your knowledge of MAS.
Option A: Recall that MAS is a primary cause of breathing problems in newborns. This statement is likely true.
Option B: This describes the basic definition of how MAS occurs. This statement is likely true.
Option D: Remember the classic chest X-ray findings for MAS, which include patchy infiltrates and atelectasis. This statement is likely true.
Option C: Consider the complications of severe MAS. The profound hypoxia it causes is a classic trigger for Persistent Pulmonary Hypertension of the Newborn (PPHN). Therefore, a statement claiming it does not lead to PPHN is contradictory to the known pathophysiology and is the most likely false statement.

Concept Tested & Keywords

Concept Tested: Meconium Aspiration Syndrome (MAS) pathophysiology and complications
Stem keywords: meconium aspiration syndrome, NOT true
Lead-in keywords: NOT
Negative lead-in flag: The question asks for the statement that is NOT true.

QIBbs_HZR2-8Cae4DuGSYX

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1099-1101