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Pre-renal AKI — RACP Paediatrics MCQ

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HardNephrologyPre-renal AKIRACP Paediatrics

A 5-year-old with pneumonia is improving but remains on intravenous maintenance fluid. Sodium has fallen from 139 to 134 mmol/L, weight is up 2%, urine output is adequate and oral intake is restarting. What prescription review is most appropriate?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: DStop unnecessary IV fluid or prescribe reduced-rate isotonic glucose-containing maintenance fluid

Explanation lettering: B = shown as A · E = shown as B · D = shown as C · C = shown as D · A = shown as E

C is correct because unwell children retain water through non-osmotic ADH; rising weight and falling sodium require stopping unnecessary IV fluid or using isotonic fluid at a reduced, reassessed rate. D perpetuates hospital-acquired hyponatraemia. E adds volume without shock. A ignores a key potassium-safety check. B waits for severe harm rather than responding to the trend. Serial weight and electrolytes are central because IV fluid is a prescribed medicine.

Reference: Royal Children’s Hospital Melbourne, Intravenous fluids: https://www.rch.org.au/clinicalguide/guideline_index/Intravenous_fluids/