A 4-week-old boy has projectile non-bilious vomiting after each feed and a palpable olive-shaped mass. Which metabolic disturbance is expected?
Answer and explanation
Correct answer: A. Hypochloraemic, hypokalaemic metabolic alkalosis
- Step 1: This is hypertrophic pyloric stenosis. Step 2. Loss of gastric acid causes alkalosis with low chloride and potassium. Answer: hypochloraemic hypokalaemic alkalosis. Why not the others: The other disturbances do not match the vomiting of gastric acid.
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