Hirschsprung's disease may be suspected if a newborn is unable to pass meconium within?

Appeared in: NORCET 5 Prelims - Sept 2023 (Shift-1)

Explanation

Hirschsprung's disease is a congenital disorder characterized by the absence of nerve cells in the distal colon, causing a functional obstruction.
A hallmark sign in the neonatal period is the failure to pass meconium.
In 99% of healthy full-term infants, meconium is passed within the first 48 hours of birth.
Therefore, a delay beyond 48 hours is a primary reason to suspect Hirschsprung's disease.
Other signs include abdominal distention, feeding intolerance, and bilious vomiting.

Option B: Waiting for 96 hours (4 days) would significantly delay the diagnosis and management of Hirschsprung's disease, increasing the risk of severe complications like enterocolitis.
Option C: While many newborns pass meconium within 12 hours, it is not unusual for a healthy infant to take longer. This timeframe is too short to be a reliable indicator of a problem.
Option D: While a delay of 72 hours is highly concerning, the clinical suspicion for Hirschsprung's disease should begin at the 48-hour mark, which is the accepted upper limit of normal for meconium passage.

Clinical Relevance

Nursing practice connection: Knowing Clinical signs of Hirschsprung's disease in newborns helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a crucial role in the early detection of Hirschsprung's disease by meticulously documenting the time of the first meconium passage for all newborns.
Failure to recognize and report delayed meconium passage can lead to a delay in diagnosis, potentially resulting in severe enterocolitis, bowel perforation, and sepsis.
What if? If a newborn who failed to pass meconium within 48 hours also develops a distended abdomen and bilious vomiting, the nurse should immediately escalate care as these are signs of a bowel obstruction, a medical emergency.

How to Approach the Question

First, identify the core concept of the question, which is the timing of meconium passage in relation to Hirschsprung's disease.
Recall the normal physiological process for a newborn. Most healthy infants pass their first stool within a specific timeframe.
Remember the key clinical indicator for Hirschsprung's disease in a neonate: a significant delay in this first stool.
Evaluate the options provided. The correct answer will be the timeframe that marks the upper limit of the normal range, after which a pathological condition should be suspected.
Select the 48-hour mark, as this is the widely accepted clinical guideline for when to suspect an issue if meconium has not been passed.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 76-78

E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 2 (pp 239-476 of 713) p. 161-163

Practise the full NORCET 5 Prelims - Sept 2023 (Shift-1)

Attempt every question from this paper in a timed mock, then review the full solution for each one.