Diabetic ketoacidosis — MRCPCH FOP MCQ
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Correct answer: E — Insulin deficiency causing ketosis and metabolic acidosis
Hyperglycaemia, marked ketonaemia, acidosis and low bicarbonate confirm DKA, which results from insulin deficiency and counter-regulatory hormone excess. Renal tubular acidosis would not cause severe hyperglycaemia and ketonaemia. Salicylate poisoning produces a different mixed acid-base pattern and does not explain polyuria with hyperglycaemia. The pearl is that DKA management corrects dehydration and insulin deficiency while avoiding rapid osmotic shifts.
Reference: NICE NG18 Diabetes in children and young people; BSPED DKA guideline