Yellow phosphorus poisoning
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yellow phosphorus poisoning clinical features pathophysiology
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yellow phosphorus poisoning diagnosis management treatment
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Yellow Phosphorus Poisoning
Overview
Yellow (white) phosphorus is an extremely toxic allotrope of phosphorus. Poisoning most commonly occurs via:
- Ingestion of rodenticides (rat paste containing 2–5% yellow phosphorus — a major route in South and Southeast Asia)
- Firework/firecracker ingestion
- Occupational/industrial exposure (matches, military incendiaries)
- Deliberate self-harm
Lethal dose: ~1 mg/kg (as little as 15–60 mg can be fatal in adults).
Pathophysiology
Yellow phosphorus is a direct cellular toxin and mitochondrial poison:
| Mechanism | Effect |
|---|---|
| Inhibits oxidative phosphorylation | Disrupts ATP synthesis, causes cellular energy failure |
| Free radical generation | Lipid peroxidation of cell membranes |
| Direct hepatocellular toxicity | Centrilobular necrosis → acute liver failure |
| Inhibits coagulation factor synthesis | Coagulopathy, DIC |
| Disrupts calcium homeostasis | Hypocalcemia, cardiac arrhythmias |
Yellow phosphorus is well absorbed from the GI tract, skin, and lungs. It is fat-soluble and concentrates in the liver, kidneys, and heart.
Clinical Presentation — Three Stages
Stage I: GI Phase (0–24 hours)
- Garlic-like odor of breath, vomit, and feces (pathognomonic)
- Luminescent vomitus and stools (glows in the dark — "smoking stool syndrome") — due to phosphine gas release
- Nausea, vomiting, abdominal pain, diarrhea
- Burning sensation in the throat and esophagus
Stage II: Latent/Quiescent Phase (24–72 hours)
- Apparent clinical improvement
- Biochemical deterioration continues silently
- Patient may appear well — do not discharge during this phase
Stage III: Systemic Toxicity (72 hours onwards)
- Hepatotoxicity: jaundice, hepatomegaly, acute liver failure (most common cause of death)
- Renal failure: acute tubular necrosis, oliguria
- Cardiovascular: hypotension, arrhythmias, cardiomyopathy
- Coagulopathy / DIC: bleeding from multiple sites
- Encephalopathy: due to hepatic failure
- Hypocalcemia, hypoglycemia
- Multi-organ dysfunction syndrome (MODS)
Diagnosis
Primarily clinical — based on history, characteristic odor, and glowing vomitus/stool.
Laboratory investigations:
- LFTs: elevated transaminases (AST/ALT may be >1000 IU/L), bilirubin — rising after 48–72 hrs
- RFTs: creatinine, urea — renal involvement
- Coagulation profile: PT/INR prolonged, low fibrinogen → DIC
- CBC: anemia, thrombocytopenia
- Electrolytes: hypocalcemia, hypophosphatemia
- Blood glucose: hypoglycemia common
- ABG: metabolic acidosis
- ECG: QTc prolongation, arrhythmias
Specific test: Phosphorus can be detected in gastric contents, blood, or urine — but is rarely available in routine settings.
"Smoking stool test": If the gastric aspirate or stool is taken to a dark room and it fluoresces/glows, it confirms yellow phosphorus ingestion.
Management
Immediate Resuscitation
- ABC — airway, breathing, circulation
- IV access, monitoring (ECG, pulse oximetry)
- Treat hypoglycemia with IV dextrose
Decontamination
| Route | Action |
|---|---|
| Ingestion | Gastric lavage with 1:5000 potassium permanganate (KMnO₄) solution — oxidizes phosphorus to less toxic phosphates |
| Skin/eye exposure | Wash with water; keep wet (yellow phosphorus ignites when dry) |
Avoid oil-based cathartics (e.g., castor oil, mineral oil) — yellow phosphorus is fat-soluble; oils increase absorption dramatically.
Specific Interventions
- Activated charcoal: limited evidence but may be given
- N-acetylcysteine (NAC): replenishes glutathione, reduces free radical damage — recommended as hepatoprotective
- Vitamin K, fresh frozen plasma: for coagulopathy
- Calcium gluconate IV: for symptomatic hypocalcemia
- Dextrose infusions: for hypoglycemia
- Antioxidants: Vitamin E, riboflavin — used empirically
Organ Support
- Renal replacement therapy (hemodialysis) — for acute kidney injury
- Lactulose, rifaximin — hepatic encephalopathy management
- Vasopressors (norepinephrine) — hemodynamic instability
Liver Transplantation
In cases of fulminant hepatic failure refractory to medical management, auxiliary partial orthotopic liver transplantation (APOLT) has been performed, as noted in Bailey & Love's (p. 1635). The native liver may regenerate over time, allowing eventual withdrawal of immunosuppression.
Prognosis & Prognostic Markers
Poor prognostic indicators:
- PT > 100 seconds (or INR > 6.5)
- Creatinine > 300 μmol/L
- pH < 7.3
- Bilirubin > 300 μmol/L
- Grade III–IV encephalopathy
- Multi-organ failure
Mortality ranges from 30–50% in symptomatic cases with hepatic failure. Early presentation and aggressive supportive care can improve outcomes.
Key Pearls
- Garlic breath + glowing vomit = yellow phosphorus until proven otherwise.
- The quiescent phase (Stage II) is deceptive — never discharge the patient during this window.
- Avoid fats and oils in diet and medications during acute management.
- KMnO₄ gastric lavage is the standard of care — oxidizes phosphorus in the stomach.
- NAC is recommended early, analogous to its use in paracetamol overdose.
- Liver transplant remains the last resort for fulminant hepatic failure (Bailey & Love's, 28th Ed., p. 1635).
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