Non bilious vomiting is seen in?

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

Pyloric stenosis involves the thickening of the pylorus muscle, which obstructs the stomach's outlet.
This obstruction is located before the ampulla of Vater, the point where bile enters the duodenum.
Consequently, any vomited material has not mixed with bile, leading to the characteristic non-bilious, projectile vomiting.

Option B: Vomiting in pancreatitis is typically bilious due to associated duodenal inflammation or ileus, which allows bile to reflux into the stomach.
Option C: Vomiting in appendicitis is a non-specific symptom that usually follows the onset of abdominal pain. It is not characteristically non-bilious.
Option D: In the context of GI symptoms, TOF refers to Tracheoesophageal Fistula. This condition causes immediate non-bilious regurgitation, coughing, and choking with feeds, not the progressive, projectile vomiting typical of pyloric stenosis.

Visual 1: Anatomical Diagram - Illustration showing the hypertrophied pyloric muscle in pyloric stenosis, highlighting the gastric outlet obstruction proximal to the duodenum.
Visual 2: Barium Swallow X-ray - Image showing the characteristic 'string sign' where a thin stream of barium passes through the narrowed pyloric channel.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Causes of non-bilious vomiting in pediatric patients as background academic context rather than a clinical decision trigger.
Recognizing non-bilious projectile vomiting in an infant is a critical nursing assessment finding that points towards pyloric stenosis, requiring prompt medical evaluation.
A key nursing intervention is to assess for signs of dehydration and electrolyte imbalance (hypochloremic metabolic alkalosis) due to persistent vomiting, and prepare the infant for surgical correction (pyloromyotomy).
What if? - If the vomiting were bilious (green-stained), it would indicate an obstruction distal to the ampulla of Vater (e.g., duodenal atresia, malrotation with volvulus), which is a surgical emergency requiring immediate investigation.

How to Approach the Question

First, understand the key term 'non-bilious vomiting'. This means the vomitus lacks bile.
Relate this to anatomy: a lack of bile implies the obstruction is in the upper gastrointestinal tract, before the bile duct empties into the small intestine (at the ampulla of Vater).
Evaluate each option based on its pathophysiology. Pyloric stenosis is a gastric outlet obstruction, which is proximal to the bile duct.
Pancreatitis, appendicitis, and other lower obstructions would likely cause bilious vomiting if obstruction is present.
Therefore, pyloric stenosis is the most fitting diagnosis for non-bilious vomiting.

Concept Tested & Keywords

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