A 34-year-old forager arrives with a grocery bag of sautéed mushrooms and a damp, earthy smell clinging to his clothes. He first vomited violently six hours after dinner, seemed better by dawn, then developed yellow eyes and a dull ache beneath the right ribs. His wife, who ate the same meal, is still asymptomatic. The laboratory panel is returning now, and the next move has not yet been made.
— What’s your move? Read on.
Before you read
- Who needs urgent antidotal therapy or transfer, even before liver failure is obvious?
- When is charcoal still useful?
When to Think of It
Think mushroom toxicity after unexplained GI illness, hallucinations, seizures, cholinergic findings, hemolysis, renal injury, or hepatitis following foraging or an uncertain mushroom meal. Timing is a major clue: early GI symptoms may be irritant toxins; a 6–24-hour latency followed by improvement and then hepatotoxicity suggests amatoxin.
Sick or Not Sick
The key call is whether this is potentially hepatotoxic or otherwise life-threatening poisoning. Admit/transfer early if there is delayed GI illness, rising AST/ALT or INR, hypoglycemia, acidosis, encephalopathy, seizures, renal injury, persistent vomiting, or an unreliable history; contact Poison Control/toxicology immediately.
The First Fifteen Minutes
- ABCs, cardiac monitor, point-of-care glucose, two IVs; obtain CBC, CMP, Mg, phosphate, bilirubin, PT/INR, venous/arterial blood gas, lactate, acetaminophen level, pregnancy test when relevant, urinalysis, and serial hepatic panels.
- Potentially toxic ingestion within 1 hour, or ongoing absorption/large ingestion after toxicology discussion → activated charcoal 1 g/kg PO/NG, maximum 50 g; it adsorbs toxin before intestinal uptake. Do not give if vomiting, ileus, or an unprotected airway.
- Vomiting with a protected airway → ondansetron 4 mg IV; it blocks 5-HT3-mediated emesis and permits hydration/charcoal.
- Hypoglycemia → dextrose 25 g IV (50 mL D50) in an adult, then recheck glucose; the liver may be unable to maintain glucose.
- Seizure or severe agitation → lorazepam 2–4 mg IV, repeat every 5–10 minutes as needed; it enhances GABA inhibition. Intubate early for recurrent seizures or loss of airway protection.
- Bradycardia, bronchorrhea, diaphoresis, or miosis suggesting muscarinic mushroom toxicity → atropine 1–2 mg IV, doubling every 5 minutes to dry secretions and improve ventilation; consult toxicology for severe cases.
- Suspected amatoxin ingestion with a compatible latency or evolving hepatitis → call Poison Control/toxicology immediately for IV silibinin or institutional protocol; availability and dosing vary substantially, so verify with Lexicomp, UpToDate, or the regional poison center. N-acetylcysteine 150 mg/kg IV over 1 hour, then 50 mg/kg over 4 hours, then 100 mg/kg over 16 hours is reasonable when significant acute liver injury is present because it supports hepatic redox capacity.
Definitive Care & Disposition
Admit symptomatic or potentially hepatotoxic patients for serial glucose, AST/ALT, bilirubin, INR, creatinine, lactate, and mental-status checks. Early transfer to a liver-transplant center is warranted for worsening INR, hypoglycemia, encephalopathy, acidosis, renal failure, or rapidly rising aminotransferases; do not wait for fulminant failure. Preserve specimens, photographs, or uneaten mushrooms for expert identification. Hemodialysis is toxin-specific and generally not useful for amatoxin after delayed presentation.
How This One Kills
The classic failure is discharging a patient after apparent improvement from the GI phase, only to miss delayed amatoxin-induced hepatic failure. A normal early transaminase panel does not exclude serious poisoning.
The Differential — What Else Looks Like This
- Infectious gastroenteritis — usually no delayed hepatitis pattern or shared exposure with a characteristic latency; mislabeling amatoxin delays transplant referral.
- Acetaminophen toxicity — obtain a level because both can cause delayed hepatic injury; missing co-ingestion forfeits effective NAC timing.
- Cholinergic pesticide poisoning — prominent secretions, bronchospasm, fasciculations, and miosis favor it; confusing the syndromes misdirects antidotal therapy.
- Viral hepatitis — epidemiology and prodrome differ, but both can produce jaundice; anchoring on infection delays toxin-focused surveillance.
The Second-Day Story
Older adults may report only weakness, anorexia, or a fall; patients may deny “mushroom ingestion” because they ate a meal prepared by someone else. Children may present with nonspecific vomiting, while partially treated patients can look well between phases. Ask specifically about foraging, cuisine, mixed mushroom dishes, and meal companions, and trend INR/glucose rather than relying on a single reassuring examination.
Back to Our Patient
Back to the 34-year-old forager: the delayed vomiting, transient improvement, new jaundice, and shared mushroom meal make amatoxin poisoning the leading diagnosis. He is recognized as potentially hepatotoxic, and the key risk-stratification call is that evolving liver injury requires monitored admission and early transplant-center involvement rather than discharge. In the first fifteen minutes, the team checks glucose and INR, gives IV NAC after toxicology consultation, controls vomiting, and avoids charcoal because he is now six hours out with ongoing emesis until his airway is safe. Serial INR, glucose, aminotransferases, bilirubin, lactate, and mental status determine escalation; he is transferred to a liver-transplant-capable ICU.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 34-year-old man with severe vomiting beginning six hours after eating foraged mushrooms, followed by transient improvement and now jaundice with right-upper-quadrant discomfort. His wife ate the same meal and is asymptomatic, and he has no fever, diarrhea-predominant illness, cholinergic secretions, or acetaminophen history. He is currently protecting his airway, but his glucose and INR are pending and his liver enzymes are rising. The delayed GI phase followed by hepatitis is most concerning for amatoxin mushroom poisoning with risk for acute liver failure. I’m placing him on monitoring, obtaining serial hepatic and coagulation studies, consulting Poison Control and hepatology, starting NAC, treating emesis, and arranging ICU-level transfer to a transplant center.”
Study Directive
- Draw the four clinical phases of amatoxin poisoning from memory.
- Memorize the three-bag NAC regimen and the indications for charcoal.
- Practice a 30-second Poison Control call using exposure, timing, symptoms, labs, and weight.
- Review one current toxicology reference for silibinin availability and local transfer criteria.
Recent Literature
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Recent clinical Psychedelic mushroom-containing chocolate exposures: Case series
Case presentations from psychedelic mushroom–containing chocolates help ED clinicians recognize these emerging intoxications and emphasize supportive, symptom-directed management of commercial edible exposures.