Salicylate Toxicity

The answer first

Salicylate toxicity is a clinical diagnosis driven by a mixed respiratory alkalosis and high-anion-gap metabolic acidosis with tinnitus, hyperventilation and altered mental status, and it is managed by urine alkalinisation with sodium bicarbonate as the cornerstone of enhanced elimination and by haemodialysis for severe poisoning defined by serum concentration, end-organ effects, or acidaemia. ^{[1] [2]} The answer-first decision at the bedside is to recognise the toxidrome, alkalinise the urine aggressively (target urine pH 7.5 to 8.0) with intravenous sodium bicarbonate and supplemental potassium, and to make the dialysis decision early rather than late, because death in salicylate poisoning is most often attributable to delayed haemodialysis in the patient with neurological deterioration, pulmonary oedema, or a falling serum pH. ^{[1] [12]}

For the FRACP candidate, this is a high-yield topic because it tests integrated acid–base interpretation, pharmacology, nephrology (dialysis indications) and critical care retrieval. Lead with the decision (the patient has severe salicylate toxicity with acidaemia and altered mental state; I am starting sodium bicarbonate now, giving potassium, and contacting the dialysis service), defend the alkalinisation targets with the cited evidence, and name the trap (a falling serum salicylate level after bicarbonate is not necessarily success — it may reflect tissue redistribution with central nervous system accumulation, and clinical deterioration is the trigger to dialyse). ^{[1] [3]}

References12ShowHide

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