A 5-week-old boy has projectile non-bilious vomiting after feeds and a palpable olive-shaped mass. Which metabolic abnormality is expected?
Answer and explanation
Correct answer: B. Hypochloraemic hypokalaemic metabolic alkalosis
- Step 1: This is hypertrophic pyloric stenosis.
- Step 2: Correct the electrolytes and then perform pyloromyotomy.
Answer
Hypochloraemic hypokalaemic metabolic alkalosis.
Why not the others: 'High anion gap metabolic acidosis' is not typical; 'Hyperchloraemic metabolic acidosis' is not typical; 'Respiratory acidosis from hypoventilation' is not typical.
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