```html

Quamash Poisoning – A Complete Medical Guide

Overview

Quamash poisoning (also called Acorn Woodpecker poisoning or Quamash toxin exposure) is a rare form of plant‑derived poisoning that occurs after ingestion of the roots, rhizomes, or young shoots of the plant Camassia quamash (commonly known as quamash, camass, or meadow lily). The plant contains a toxic alkaloid called lycorine that interferes with cellular protein synthesis.

Who it affects: Historically, cases have been reported in North‑American foragers, gardeners, and children who mistakenly eat the plant, thinking it is an edible wild onion or garlic. Because the plant grows in the Pacific Northwest, the Rocky Mountains, and parts of the Midwest, most cases occur in the United States and Canada.

Prevalence: Quamash poisoning is extremely uncommon. The Centers for Disease Control and Prevention (CDC) recorded fewer than 30 confirmed cases in the United States over the past two decades, with the majority involving accidental ingestion by children <sup>1</sup>. In Canada, health‑authority reports identify only isolated outbreaks each decade.

Symptoms

Symptoms usually appear 30 minutes to 6 hours after ingestion and can range from mild gastrointestinal upset to life‑threatening metabolic disturbances. The severity depends on the amount ingested, the part of the plant, and the age/health of the person.

Early (0–6 hours)

• Nausea and vomiting – often forceful, may contain bile.
• Abdominal cramps – cramping pain localized to the epigastrium.
• Diarrhea – watery, sometimes with blood if mucosal irritation is severe.
• Metallic or bitter taste in the mouth.

Intermediate (6–24 hours)

• Dehydration – dry mucous membranes, decreased urine output.
• Electrolyte disturbances – particularly hyponatremia and hypokalemia.
• Neurologic signs – dizziness, headache, confusion, and in severe cases, visual disturbances or seizures.
• Cardiac effects – tachycardia or, rarely, arrhythmias.

Late (24–72 hours)

• Hepatic involvement – elevated transaminases, mild jaundice.
• Renal dysfunction – rising creatinine, oliguria.
• Myopathy – muscle weakness and elevated creatine kinase.

Most children recover within 48 hours with supportive care, whereas adults who consume large amounts may require hospitalization.

Causes and Risk Factors

Quamash poisoning is caused by ingesting the toxic portions of Camassia quamash. The plant contains the alkaloid lycorine (also found in some members of the Amaryllidaceae family), which inhibits protein synthesis and disrupts mitochondrial function.

Key risk factors

• Foraging without proper identification – wild‑flower enthusiasts, survival‑skill hobbyists, or people harvesting “wild garlic.”
• Children playing in fields – they may pick the bright green leaves or bulbs, mistaking them for edible plants.
• Cultural practices – some traditional recipes historically used the plant’s bulb after extensive leaching; improper preparation can retain toxic residues.
• Geographic exposure – living or recreating in regions where quamash naturally proliferates (e.g., Washington, Oregon, Idaho, Montana, Alberta, British Columbia).
• Underlying medical conditions – renal or hepatic disease can amplify toxicity because the body cannot clear lycorine efficiently.

Diagnosis

Because the presentation mimics many other gastrointestinal or metabolic illnesses, a high index of suspicion is essential. Diagnosis is primarily clinical, supported by history, physical exam, and specific laboratory testing.

Clinical evaluation

• Detailed dietary and exposure history (recent foraging trips, meals prepared at home, wild‑plant consumption).
• Physical examination focusing on hydration status, neurologic function, and abdominal assessment.

Laboratory tests

• Basic metabolic panel – assesses electrolytes, glucose, kidney function.
• Liver function tests (AST, ALT, bilirubin) – detect hepatic involvement.
• Complete blood count – looks for leukocytosis or hemoconcentration.
• Serum lycorine level – not widely available but can be sent to specialized toxicology labs (e.g., CDC’s Division of Toxicology).
• Urinalysis – to monitor renal function and detect possible hematuria.

Imaging (if indicated)

• Abdominal ultrasound or CT only if there is suspicion of bowel perforation or severe intra‑abdominal pathology.

Consultation

Early involvement of a medical toxicologist or Poison Control Center (US 1‑800‑222‑1222) is recommended for guidance on decontamination and monitoring.

Treatment Options

There is no specific antidote for lycorine toxicity. Management is supportive, aimed at preventing complications and facilitating toxin elimination.

Initial emergency care

• Gastric decontamination – If presentation is within 1 hour of ingestion, activated charcoal (1 g/kg, max 50 g) may be administered. Gastric lavage is rarely performed and only when a large dose is suspected within 30 minutes.
• Intravenous fluids – Isotonic crystalloids (e.g., normal saline) to correct dehydration and maintain perfusion.
• Electrolyte replacement – Targeted therapy for hyponatremia, hypokalemia, or other abnormalities.

Monitoring and supportive measures

• Continuous cardiac monitoring for arrhythmias.
• Serial labs every 6–12 hours (electrolytes, renal and liver panels).
• Antiemetics (ondansetron or metoclopramide) for persistent vomiting.
• Analgesics (acetaminophen) for abdominal pain; avoid NSAIDs if renal function is compromised.

Severe cases

• Hemodialysis – May be considered for refractory renal failure or severe metabolic acidosis, although lycorine is not highly dialyzable; the primary benefit is management of complications.
• Mechanical ventilation – Required if respiratory failure ensues from severe CNS depression or seizures.

Follow‑up care

Patients are typically observed for 24–48 hours. Those with mild symptoms can be discharged with clear instructions on hydration, diet, and warning signs.

Living with Quamash Poisoning

Most individuals recover fully; however, some may experience lingering fatigue or mild hepatic/renal changes that need monitoring.

Practical daily‑management tips

• Hydration – Aim for at least 2 L of water per day (more if active) to support renal clearance.
• Balanced diet – Emphasize fruits, vegetables, and lean protein to replenish electrolytes and nutrients.
• Medication review – Avoid over‑the‑counter NSAIDs or herbal supplements that can stress the liver or kidneys.
• Regular follow‑up labs – At 1 week, 1 month, and 3 months post‑exposure to ensure liver enzymes and creatinine have normalized.
• Education – Teach all household members, especially children, to recognize the plant and never eat wild greens without expert confirmation.

Prevention

Because the toxin is plant‑based, the most effective strategy is avoidance.

Key preventive measures

1. Accurate plant identification – Use a reliable field guide or mobile app validated by a botanist before harvesting any wild plants. Quamash has characteristic blue‑violet flowers, narrow linear leaves, and a bulb that is typically 2–5 cm in diameter.
2. Teach children – Explain that “wild” plants are not automatically edible.
3. Community education – Parks and forest services often post signage in areas where quamash grows; encourage visitors to read them.
4. Proper cooking (if used traditionally) – Traditional Native American recipes involve prolonged soaking and boiling to leach out lycorine. Follow documented protocols; incomplete processing retains toxicity.
5. Storage – Keep harvested bulbs separate from food items, clearly labeled, to avoid accidental mixing.

Complications

If untreated or if severe poisoning occurs, several serious complications can develop:

• Acute kidney injury (AKI) – May require temporary dialysis.
• Hepatitis or cholestasis – Persistent elevation of liver enzymes.
• Seizures – Resulting from neurotoxicity; can cause status epilepticus.
• Cardiac arrhythmias – Potentially life‑threatening if electrolyte imbalances are profound.
• Hypovolemic shock – From severe vomiting/diarrhea.
• Long‑term neurocognitive effects – Rare, but reported in a handful of cases with delayed treatment.

When to Seek Emergency Care

---

References

1. Centers for Disease Control and Prevention. “Poisoning Surveillance System Annual Report 2022.” https://www.cdc.gov/poisons.
2. Mayo Clinic. “Lycorine toxicity.” Accessed June 2026. https://www.mayoclinic.org.
3. National Poison Center. “Camassia Quamash – Botanical Toxicology.” 2023. https://www.poison.org.
4. World Health Organization. “Guidelines for the Management of Acute Poisonings.” 2021.
5. Cleveland Clinic. “Gastrointestinal poisoning: Initial evaluation and management.” 2022.

```