Nursing care
Reye Syndrome nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Reye syndrome is acute encephalopathy with fatty liver failure that follows a viral illness treated with aspirin, usually in a child under 18. Watch for vomiting that will not stop, then confusion, days after a fever has already settled. Priority nursing action is neuro checks and glucose, because cerebral oedema and hypoglycaemia are what kill.
Recognising it at the bedside
The pattern is a child who had chickenpox or flu a few days ago, seemed to be recovering, and is now vomiting repeatedly with no diarrhoea. Ask about aspirin. A parent may have given it for fever without knowing the link, or it may have been in a combination cold remedy they did not read closely. That single question does more diagnostic work than almost anything else you will ask on admission.
Vomiting is followed by a change in mental status, and this is the shift that should move the child up your acuity list. Lethargy progresses to irritability, then confusion, then combativeness, then coma, sometimes over a matter of hours. There is no rash and no focal neuro deficit early on, which is part of why it gets missed. Document the exact sequence and timing you observe, because staging (Lovejoy staging, in most paediatric protocols) drives the treatment plan and the trajectory is the diagnostic clue as much as any single finding.
Why the classic presentation misleads
The child looks like they are recovering from a virus, not getting sicker from something new, so the vomiting reads as a stomach bug and the confusion reads as tiredness after being unwell. Fever is often low grade or absent by the time encephalopathy starts, so 'no fever' gets used to rule out something serious when it should not be.
There is no rash, no jaundice in the early stage, and the liver is enlarged but not tender, so abdominal exam gives little to go on. Ammonia rises before bilirubin does, so a nurse relying on 'the whites of the eyes aren't yellow' to exclude liver involvement will miss it. The presentation mimics gastroenteritis, meningitis without the neck stiffness, or simple dehydration, and the aspirin history is the only thing that reliably points the right direction.
Priority nursing actions
Airway and neuro status first. Assess GCS on admission and reassess frequently, because deterioration can be fast and the threshold for intubation is lower than staff expect if intracranial pressure is climbing. Elevate the head of the bed 30 degrees, keep the neck neutral, and minimise stimulation, all standard measures to limit ICP rise.
Check a bedside glucose immediately. Hypoglycaemia is common because the fatty liver cannot maintain glycogen stores, and IV dextrose is often started before labs return. Get IV access, hold all aspirin and any aspirin-containing products, and hold oral intake until mental status and vomiting are assessed, since aspiration risk rises with confusion. Strict intake and output, and correct any coagulopathy before invasive lines go in, since the liver is also failing to produce clotting factors.
Labs and diagnostics to expect
Serum ammonia is the key marker and is usually markedly elevated; it correlates with the degree of encephalopathy better than any other single value. Liver enzymes, AST and ALT, are elevated, but bilirubin is usually normal or only mildly raised, which is what separates this from typical hepatitis on the panel.
Prothrombin time is prolonged from impaired clotting factor synthesis. Blood glucose is often low. A metabolic screen is usually sent to rule out an inborn error of metabolism, since some metabolic disorders mimic Reye syndrome closely enough that the distinction matters for long-term management. Liver biopsy showing fatty infiltration without inflammation was historically the confirmatory test; it is used far less now that the aspirin link and clinical picture usually make the diagnosis.
Complications and their early signs
Cerebral oedema is the complication that kills. Watch for the Cushing triad, widening pulse pressure, bradycardia, irregular respirations, and for pupils that become sluggish or unequal. A sudden drop in GCS or new posturing is an emergency, not a finding to chart and revisit later.
Hepatic failure can progress alongside the neuro picture, so watch for worsening coagulopathy, bruising, or bleeding from IV sites. Seizures can occur as ICP rises or from metabolic derangement, so have seizure precautions in place once a child is staged beyond the earliest, mildest level. Respiratory depression follows falling consciousness, so continuous pulse oximetry and a low threshold to call for airway support are standard, not optional.
Teaching that changes outcomes
The single teaching point that prevents this disease is: no aspirin for fever or viral illness in anyone under 18, full stop. Acetaminophen and ibuprofen are the choices, and parents need to hear that plainly, not as one line buried in discharge paperwork.
Many parents do not know aspirin is aspirin when it appears under a brand name or inside a combination cold and flu product, so teach label reading, specifically the word 'salicylate' and the abbreviation ASA. This is worth repeating at every well-child visit during flu and chickenpox season, and it is worth asking directly whether there is aspirin in the house at all, since removing it is more reliable than trusting a label check under pressure.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our pediatrics practice questions are the closest set to what this page covers.
Common questions
Can adults get Reye syndrome?
It is overwhelmingly a paediatric condition, typically age 4 to 12, and the aspirin-viral illness link is the reason it is now rare in children. Adult cases are reported but are exceptional, not something to screen for routinely.
Is Reye syndrome contagious?
No. The preceding viral illness, usually influenza or varicella, is contagious, but Reye syndrome itself is a metabolic and neurological complication in that child, not a transmissible disease.
What NCLEX-style question pattern comes up for this topic?
Expect a case with a child recovering from flu or chickenpox who develops sudden vomiting and altered mental status, often with an aspirin history buried in the stem. The correct answer usually centres on checking glucose, protecting the airway, or identifying the medication error rather than treating it as simple gastroenteritis.
Why is ibuprofen preferred over aspirin for children with fever?
Ibuprofen and acetaminophen are not linked to Reye syndrome, while aspirin given during a viral illness is the established trigger. This is why paediatric fever protocols exclude aspirin as a first-line antipyretic in nearly all cases.