Ergotism – Causes, Symptoms and Treatment
Ergotism is a poisoning caused by ergot alkaloids produced by the fungus Claviceps purpurea. It can lead to severe circulatory disorders or neurological symptoms.
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Ergotism is a poisoning caused by ergot alkaloids produced by the fungus Claviceps purpurea. It can lead to severe circulatory disorders or neurological symptoms.
What is Ergotism?
Ergotism is a toxic condition caused by ergot alkaloids, substances produced by the fungus Claviceps purpurea, which infects rye and other cereal grains. The infected grain is known as ergot (from the French argot, meaning spur). Historically, ergotism caused widespread outbreaks when contaminated grain was used to make flour and bread. In the Middle Ages, it was known as St. Anthony's Fire or Ignis sacer. Today, ergotism is rare in industrialized countries but can still occur due to the improper use of ergotamine-containing medications.
Causes
Ergotism results from the ingestion of ergot alkaloids, particularly ergotamine, ergometrine, and related compounds. This can occur in two main ways:
- Foodborne ergotism: Consumption of grain or grain products (such as bread or flour) contaminated with Claviceps purpurea.
- Medication-induced ergotism: Overdose or prolonged use of ergotamine-based medications prescribed for conditions such as migraine or postpartum uterine contraction.
Risk factors for medication-induced ergotism include the concurrent use of CYP3A4 inhibitors (such as certain antibiotics like erythromycin or azole antifungals), which inhibit the hepatic metabolism of ergotamine and thereby increase plasma drug levels.
Forms of Ergotism
Gangrenous Ergotism
This form is characterized by intense vasoconstriction (narrowing of blood vessels), leading to chronic ischemia of the extremities. In severe cases, gangrene (tissue death) can develop, particularly affecting the fingers, toes, hands, and feet. This was the predominant form in historical mass poisoning events.
Convulsive Ergotism
This form affects the central nervous system and presents with convulsions, hallucinations, tingling sensations, and other neurological symptoms. It was historically more prevalent in certain regions of Europe and is thought to be linked to dietary deficiencies that aggravated the toxic effects.
Symptoms
Symptoms of ergotism vary depending on the form and severity of poisoning:
- Burning, tingling pain in the extremities (a sensation often described as crawling under the skin)
- Coldness, numbness, and pallor of the limbs
- Absent peripheral pulse in affected limbs
- Tissue blackening and gangrene in severe cases
- Nausea, vomiting, and diarrhea
- Headache and dizziness
- Seizures and epileptiform convulsions (in convulsive form)
- Hallucinations and behavioral changes
Diagnosis
Diagnosis is based on a combination of medical history, clinical examination, and diagnostic tests:
- Patient history: Use of ergotamine-containing medications or possible consumption of contaminated grain products
- Physical examination: Assessment of peripheral circulation, skin color, and pulse in the extremities
- Doppler ultrasound or angiography: To detect vasospasm and reduced blood flow in peripheral arteries
- Laboratory testing: Toxicological screening for ergot alkaloids in blood or urine
Treatment
Treatment depends on the severity of the poisoning and includes:
- Immediate cessation of ergotamine intake (discontinuing the medication or avoiding contaminated food)
- Vasodilators such as sodium nitroprusside or calcium channel blockers to counteract vasospasm
- Anticoagulation to prevent thrombosis in ischemic limbs
- Supportive care: Warmth, pain management, and adequate hydration
- In severe cases with established gangrene: Surgical intervention, potentially including amputation of affected limbs
- Review and adjustment of concomitant medications to avoid CYP3A4 inhibitors
Prevention
In modern industrialized nations, ergotism is largely prevented through strict quality control measures in grain production and processing. Legal limits for ergot alkaloids in food are regulated by law, for example under EU regulations. When ergotamine-based medications are prescribed, maximum dosages and contraindications must be strictly observed to prevent medication-induced ergotism.
References
- Berde B, Stürmer E. Ergot Alkaloids and Related Compounds. Springer-Verlag, Berlin, 1978.
- de Groot AN. Ergotamine and ergotism. Obstetrical and Gynecological Survey. 1995;50(12):847-849. PubMed PMID: 8570066.
- European Food Safety Authority (EFSA). Risks for human health related to the presence of ergot alkaloids in food and feed. EFSA Journal. 2012;10(7):2798. DOI: 10.2903/j.efsa.2012.2798.
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Related search terms: Ergotism + Ergotismus + Ergot poisoning + St. Anthony's Fire + Convulsive ergotism