Paeds · acute-care-resuscitation-and-toxicology
Iron, salicylate and toxic alcohol poisoning
Also known as Paediatric iron overdose · Paediatric salicylate poisoning · Methanol poisoning in children · Ethylene glycol poisoning in children · Desferrioxamine for iron toxicity · Fomepizole for toxic alcohol poisoning · High-anion-gap metabolic acidosis from poisoning · Urinary alkalinisation for salicylate
A fellowship approach to the child who has ingested iron, salicylate or a toxic alcohol: recognise the shared high-anion-gap metabolic acidosis and the poison-specific signature (the four-stage corrosive course and radiopaque tablets of iron, the mixed respiratory alkalosis plus anion-gap acidosis and tinnitus of salicylate, the dual anion-gap plus osmolal-gap with visual or renal-crystal clues of methanol and ethylene glycol), give the correct weight-based antidote (intravenous desferrioxamine 15 mg per kg per hour for iron, urinary alkalinisation to urine pH 7.5 to 8.0 for salicylate, intravenous fomepizole 15 mg per kg loading for toxic alcohols), decontaminate by poison, and avoid the three lethal traps of latent-phase reassurance, salicylate intubation without maintained hypocapnia, and waiting for toxic-alcohol levels before fomepizole.
Checked against its sources on 2 Sept 2026
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Red flags
- A child with a high-anion-gap metabolic acidosis plus radiopaque tablets on abdominal X-ray is iron-toxic: give intravenous desferrioxamine once serum iron over 500 microgram per dL, acidosis or shock is present, and never be reassured by the latent phase
- Mixed respiratory alkalosis plus high-anion-gap metabolic acidosis with tinnitus and hyperpnoea is salicylate toxicity: alkalinise the urine to pH 7.5 to 8.0 after correcting potassium, and dialyse at over 7.2 mmol per L (100 mg per dL, about 720 mg per L) or for CNS or pulmonary signs
- High-anion-gap acidosis PLUS elevated osmolal gap with visual symptoms or calcium oxalate crystalluria is a toxic alcohol: start intravenous fomepizole 15 mg per kg loading on suspicion and do NOT wait for methanol or ethylene glycol levels
- Loss of the hyperventilatory compensation after intubating a salicylate-toxic child causes rapid fatal acidosis: pre-oxygenase, give a bicarbonate bolus, and set the ventilator to maintain pre-intubation hypocapnia
- A normal osmolal gap late in the course does NOT exclude a toxic alcohol: the osmolal gap falls as the anion gap rises; treat on the clinical picture and the anion gap
- Methyl salicylate (oil of wintergreen) is highly concentrated: as little as 4 mL can kill a toddler; treat any ingestion as life-threatening
- Activated charcoal is useless for iron (a metal) and for toxic alcohols (small molecules); it adsorbs only salicylate
- Any child who may need dialysis, vasoactive support, mechanical ventilation or intensive care unavailable locally: call the poisons centre, senior, PICU or retrieval before local support is exceeded
Life stages
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- Acute Care
- Current 2026 PREP curriculum — Learning Objective 2.4.4: Assess and manage infants, children and young people with potential cardiac, respiratory or neurological emergencies or acute sepsis
- Current 2026 PREP curriculum — Learning Objective 2.2.3: Perform acute resuscitation and advanced life support
- Current 2026 PREP curriculum — Learning Objective 2.2.1: Recognise, prioritise and manage an acutely ill infant, child or young person
- Renewed curriculum for first-year trainees from 2027 — Learning goal 11: Acute care and procedures
- Renewed curriculum for first-year trainees from 2027 — Learning goal 17: Acute care
- Clinical Applications
- Medical Sciences
- Long Cases
- Short Cases
- 4. Professional skills and knowledge: Patient management
- 7. Patient safety, including safe prescribing
- General Paediatrics: Resuscitates, stabilises and treats extremely unwell babies, children and young people, liaising with specialist teams, as necessary
- General Paediatrics: Assumes the role of Acute Paediatric Team Leader
- Applied Knowledge in Practice (AKP)
- Theory and Science (TAS)
- Clinical
- History
- Communication
- Video
- General Pediatrics Content Outline — Domain 7: Emergency and Critical Care
- General Pediatrics Content Outline — Universal Task 4: Management and Treatment
- General Pediatrics EPA 7: Recognizing a Severely Ill Patient, Providing Initial Management, and Mobilizing Resources Needed for Continued Care
- Patient Care 5: Patient Management
- Patient Care 4: Clinical Reasoning
- Systems-Based Practice 1: Patient Safety
- Medical Expert
- Pediatrics: Core EPA #2 — Resuscitating and stabilizing critically ill patients
- Pediatrics: Foundations EPA #1 — Recognizing deteriorating and/or critically ill patients and initiating stabilization and management
Overview & Definition
A child arrives with vomiting, fast deep breathing and a falling level. The venous gas shows a metabolic acidosis with a wide anion gap. The list of causes is long, but in paediatric toxicology three ingestions dominate this picture because each, by a different route, disables the mitochondrion: iron, salicylate, and the toxic alcohols methanol and ethylene glycol. Holding the three together is not a memory trick; it is how the examiner frames the question, because the resuscitation is shared while the antidote is poison-specific. [3] [10]
The unifying mechanism is impaired oxidative phosphorylation. Free iron catalyses the Fenton reaction, generating hydroxyl radicals that peroxidise mitochondrial membranes. Salicylate directly uncouples oxidative phosphorylation in the same way it does in the mitochondrion of a febrile cell. Methanol and ethylene glycol are harmless until hepatic alcohol dehydrogenase converts them to formic and oxalic acid, which inhibit mitochondrial cytochrome oxidase and precipitate in renal tubules. In every case the cell falls back on anaerobic glycolysis, lactate accumulates, and the child develops a high-anion-gap metabolic acidosis. The organ that fails first differs (the liver in iron, the brain and lung in salicylate, the retina and kidney in the toxic alcohols), but the metabolic signature is shared. [3] [10]
The clinical skill the examiner is testing is whether you can read the poison-specific clues out of the shared acidosis, give the correct weight-based antidote, choose the right decontamination, and avoid the three lethal traps that kill children: discharging during the deceptive iron latent phase, intubating a salicylate-toxic child without maintaining the hypocapnia that has been keeping them alive, and waiting for toxic-alcohol levels before starting fomepizole. Each trap is a failure to understand mechanism, not a failure of memory. [1] [6] [9]
References16ShowHide
- [1]Chang TP, Rangan C Iron poisoning: a literature-based review of epidemiology, diagnosis, and management Pediatric Emergency Care, 2011.PMID 21975503
- [2]Manoguerra AS, Erdman AR, Booze LL, et al. Iron ingestion: an evidence-based consensus guideline for out-of-hospital management Clinical Toxicology, 2005.PMID 16255338
- [3]Rafati Rahimzadeh M, Rafati Rahimzadeh M, Kazemi S, et al. Iron; benefits or threatens (with emphasis on mechanism and treatment of its poisoning) Human and Experimental Toxicology, 2023.PMID 37526177
- [4]Chandran J, Sanketh R, Vyasam S, et al. Accidental iron poisoning in children - Experience from a teaching institution Journal of Family Medicine and Primary Care, 2023.PMID 38074262
- [5]Gaudreault P, Temple AR, Lovejoy FH Jr The relative severity of acute versus chronic salicylate poisoning in children: a clinical comparison Pediatrics, 1982.PMID 7122154
- [6]Snodgrass WR Salicylate toxicity Pediatric Clinics of North America, 1986.PMID 3960612
- [7]Juurlink DN, Gosselin S, Kielstein JT, et al. Extracorporeal treatment for salicylate poisoning: systematic review and recommendations from the EXTRIP workgroup Annals of Emergency Medicine, 2015.PMID 25986310
- [8]O'Keefe M, Stanton M, Feldman R, et al. Incidence of rebound salicylate toxicity following cessation of urine alkalinization Clinical Toxicology, 2023.PMID 37427892
- [9]Brent J Fomepizole for ethylene glycol and methanol poisoning New England Journal of Medicine, 2009.PMID 19458366
- [10]Kraut JA, Mullins ME Toxic Alcohols New England Journal of Medicine, 2018.PMID 29342392
- [11]Chen TH, Kuo CH, Huang CT, et al. Use of fomepizole in pediatric methanol exposure: the first case report in Taiwan and a literature review Pediatrics and Neonatology, 2016.PMID 24332660
- [12]Prescott LF, Balali-Mood M, Critchley JA, et al. Diuresis or urinary alkalinisation for salicylate poisoning? Br Med J (Clin Res Ed), 1982.PMID 6291695
- [13]Ashurst JV, Schaffer DH, Nappe TM. Methanol Toxicity StatPearls (NCBI Bookshelf), 2026.PMID 29489213
- [14]Chen RJ, Glagola JJ, Nappe TM. Ethylene Glycol Toxicity StatPearls (NCBI Bookshelf), 2026.PMID 30725694
- [15]Brent J, McMartin K, Phillips S, et al. Fomepizole for the treatment of ethylene glycol poisoning. Methylpyrazole for Toxic Alcohols Study Group N Engl J Med, 1999.PMID 10080845
- [16]Ghannoum M, Gosselin S, Hoffman RS, et al. Extracorporeal treatment for ethylene glycol poisoning: systematic review and recommendations from the EXTRIP workgroup Crit Care, 2023.PMID 36765419