A nurse is assessing a 6-month-old infant who is suspected of having Hirschsprung's disease. Which assessment finding would be most characteristic of this condition?

Understanding Hirschsprung's Disease

Hirschsprung's disease (HD) is a congenital condition resulting from the failure of neural crest cells to migrate properly during fetal development, leading to an absence of ganglion cells in the distal bowel. This aganglionic segment lacks the ability to relax, causing a functional obstruction. The most common presentation in neonates and infants is a failure to pass meconium within the first 48 hours of life, which is a hallmark sign. This is followed by chronic, progressive constipation and significant abdominal distension as stool and gas accumulate proximal to the obstructed segment. The case reports in the provided materials consistently highlight this classic presentation. For instance, a neonate with Goldberg-Shprintzen megacolon syndrome, which includes HD, presented on day 4 of life with abdominal distension and delayed passage of meconium ^[2]. Similarly, a 13-day-old neonate with Waardenburg-Shah syndrome, another condition associated with HD, was admitted with abdominal distension and bilious vomiting ^[3]. In older children and even adults, the presentation shifts to a history of severe, lifelong chronic constipation, as seen in a 17-year-old patient whose HD was diagnosed late after presenting with acute obstipation and a dilated colon ^[4]. The foundational study comparing early versus late diagnosis confirms that when HD is identified after 1 year of age, the clinical history is dominated by long-standing functional obstruction .

Analysis of the Correct Answer (Option 1)

This option directly reflects the pathophysiology of HD. The aganglionic segment, most often in the rectosigmoid colon, creates a tonic contraction that prevents the normal passage of stool. The failure to pass meconium within 48 hours is a critical early warning sign in the neonatal period. As the infant grows, the inability to effectively evacuate the colon leads to chronic constipation and progressive abdominal distension. This is the classic and most characteristic clinical trajectory for an infant with HD, as supported by the consistent presentation of delayed meconium passage and abdominal distension in the neonatal case reports [2, 3].

Analysis of Incorrect Options

• Option 2: Frequent loose, watery stools with blood and mucus, and poor weight gain is a presentation more consistent with an inflammatory or malabsorptive condition, such as cow's milk protein allergy, infectious enterocolitis, or cystic fibrosis. While Hirschsprung's-associated enterocolitis (HAEC) can present with explosive, foul-smelling diarrhea, fever, and abdominal distension, it is a complication of the disease, not the most characteristic initial presentation of a previously undiagnosed 6-month-old infant. The primary, defining feature is the obstructive pattern of delayed meconium passage and chronic constipation.




• Option 3: Projectile vomiting immediately after feeding and failure to thrive is the classic presentation of hypertrophic pyloric stenosis. This condition involves a mechanical obstruction at the gastric outlet, leading to non-bilious, forceful vomiting. This symptom complex is distinct from the distal intestinal obstruction seen in HD, which would more likely cause bilious vomiting if an obstruction is high enough or progressive abdominal distension.




• Option 4: Excessive crying during feeding with arching of the back and irritability is a hallmark presentation of gastroesophageal reflux disease (GERD) in infants. The arching, known as Sandifer syndrome, is a posturing behavior to protect the airway from refluxed acidic contents. While an infant with HD may be irritable due to abdominal distension, this specific constellation of symptoms localized to the feeding period points directly to GERD, not a congenital colonic motility disorder.

Clinical Significance and Diagnostic Confirmation

For the NCLEX-RN, recognizing the classic presentation of HD is crucial for prioritizing care and anticipating diagnostic procedures. The most characteristic finding in a 6-month-old infant is a history of delayed meconium passage and ongoing severe constipation with a distended abdomen. The diagnosis is confirmed by a rectal suction biopsy, which reveals the absence of ganglion cells in the submucosal plexus, as was performed to confirm HD in the neonate with suspected Goldberg-Shprintzen syndrome ^[2]. The long-term study on HD highlights that even with surgical correction via a pull-through procedure, these patients require long-term follow-up to monitor functional outcomes, including bowel habits and continence . In rare cases, a late diagnosis can lead to severe complications, such as the need for a total colectomy due to incomplete resection or persistent obstruction, underscoring the importance of early recognition and intervention ^[4].