An 8-week-old boy is brought to the ED with a
3-day history of vomiting. His venous blood gas
shows:
• pH 7.55 (7.35–7.45)
• HCO3
− 40 mmol/L (22–24)
• PCO2 48 mmol/L (35–45)
• K+ 2.8 mmol/L (3.5–5.0)
• Na+ 135 mmol/L (135–145)
• Cl− 85 mmol/L (95–105).
His gas improves with normal saline therapy. Which
ONE of the following conditions is the MOST likely
cause of his blood gas result?
A. Sepsis
B. Adrenogenital syndrome
C. Adrenal insufficiency
D. Pyloric stenosis
#Emergency #mcqs4med