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Pulmonary-renal syndrome — SCE Acute Medicine MCQ

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HardAcute Renal and Metabolic EmergenciesPulmonary-renal syndromeSCE Acute Medicine

A man arrives after drinking windscreen-washer fluid. He has blurred vision, Kussmaul breathing, pH 6.91, bicarbonate 6 mmol/L, anion gap 34 mmol/L and measured osmolal gap 38 mOsm/kg. What is the definitive emergency treatment bundle?

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

Reveal the answer and explanation

Correct answer: DGive fomepizole and IV bicarbonate, and arrange urgent haemodialysis with NPIS/renal support

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

E is correct. Severe methanol poisoning is strongly supported by visual toxicity, a high-anion-gap metabolic acidosis and raised osmolal gap. Alcohol-dehydrogenase blockade with fomepizole prevents further formate generation, bicarbonate treats profound acidaemia and urgent haemodialysis removes methanol/formate while correcting acid-base disturbance. NPIS and renal/critical-care teams should be involved immediately; treatment must not await a send-away level. A omits dialysis despite severe features. B treats opioid toxicity. C dangerously delays extracorporeal treatment. D is the cyanide antidote pathway. Folinic/folic acid is an additional metabolic adjunct, not a substitute for this bundle.

Reference: EXTRIP systematic review and recommendations for methanol poisoning: https://pmc.ncbi.nlm.nih.gov/articles/PMC6730523/