In infants with pyloric stenosis, palpation of an "olive-shaped" mass in the abdomen should be cross-checked with which clinical feature?

1. A

   Projectile bilious vomiting

2. B

   Single visible gastric peristaltic wave

3. C

   Recurrent diarrhea

4. D

   Hematemesis

Appeared in: NORCET 9 Mains - 2025

Explanation

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• The 'olive-shaped' mass is the physically palpable, hypertrophied pyloric muscle.
• A visible gastric peristaltic wave is the direct physiological response to this obstruction, as the stomach muscles contract forcefully to push contents past the narrowed pylorus.
• Observing this wave, which typically moves from left to right across the upper abdomen after a feed, strongly corroborates the diagnosis of pyloric stenosis when an olive-like mass is felt.

Why Other Options Were Wrong

• Option A: The vomiting in pyloric stenosis is characteristically non-bilious. The obstruction occurs before the point where bile enters the digestive tract (the ampulla of Vater).
• Option C: Diarrhea is not associated with pyloric stenosis. Due to the gastric outlet obstruction, infants typically present with decreased stooling or constipation.
• Option D: Hematemesis (vomiting blood) is not a primary or common sign of pyloric stenosis. While minor irritation might cause flecks of blood, it is not a corroborating feature.

Related Visual

• Visual 1: Anatomical Diagram - An illustration showing the cross-section of a stomach with a thickened pyloric muscle, clearly labeling the obstruction, as seen in the provided image. This helps visualize the underlying cause.
• Visual 2: Clinical Photograph/Video - A visual of an infant's abdomen showing a distinct peristaltic wave moving from left to right. This demonstrates the key clinical sign asked about in the question.

Clinical Relevance

• Nursing practice connection: Knowing Clinical assessment and diagnosis of hypertrophic pyloric stenosis in infants helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• A nurse's ability to recognize the cluster of signs for pyloric stenosis (palpable olive, visible peristalsis, projectile non-bilious vomiting) is crucial for early diagnosis and intervention, preventing severe dehydration and metabolic disturbances.
• Pre-operative management is a key nursing responsibility, focusing on fluid and electrolyte correction. Surgery is not an emergency, but correcting the metabolic alkalosis is essential to prevent post-operative apnea.
• What if? If the infant's vomit were bilious (green), this would be a surgical emergency. The nurse's priority would shift to immediate escalation for suspected malrotation with volvulus, as this can lead to bowel necrosis.

How to Approach the Question

• First, identify the core condition: The question stem explicitly mentions 'pyloric stenosis' and its classic sign, the 'olive-shaped' mass.
• Next, understand the pathophysiology of the condition. Pyloric stenosis is a gastric outlet obstruction. This means food can't easily leave the stomach.
• Think about the body's response to this blockage. The stomach will contract more forcefully to try and overcome it. This leads to visible peristaltic waves.
• Evaluate each option based on this pathophysiology. The vomiting must be non-bilious because the blockage is before the bile duct entrance. Diarrhea is unlikely as little food passes through. Therefore, the visible wave is the most logical corroborating sign.

Concept Tested & Keywords

• Concept Tested: Clinical assessment and diagnosis of hypertrophic pyloric stenosis in infants.
• Stem keywords: infants, pyloric stenosis, palpation, olive-shaped mass
• Lead-in keywords: cross-checked with
• Clinical cues: The presence of an 'olive-shaped' mass is a pathognomonic physical finding for hypertrophic pyloric stenosis.

Question ID

Q7dbaHUMUqfXOKOuOt1hWv

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