رضيع عمره ٥ أسابيع يتقيأ بقوة بعد كل رضعة قيئاً بلا عصارة صفراء، وجائع دائماً، ويُحس بكتلة بحجم الزيتونة في أعلى البطن. أي نتيجة تحليل متوقعة؟

A 5-week-old vomits forcefully after every feed, the vomit is not bile-stained, he is always hungry, and an olive-sized mass is felt in the upper abdomen. Which laboratory finding is expected?

1. Hypochloraemic metabolic alkalosis
2. Respiratory acidosis with raised CO2
3. Hyperkalaemia with hypernatraemia
4. Hyperchloraemic metabolic acidosis

Answer: A) Hypochloraemic metabolic alkalosis. This is pyloric stenosis; repeated vomiting loses gastric hydrochloric acid, producing hypochloraemic, hypokalaemic metabolic alkalosis. Fluids and electrolytes are corrected before surgery.