Aluminum phosphide poisoning: Difference between revisions
Ostermayer (talk | contribs) (Created page with "Aluminum phosphide (AlP) poisoning is one of the most lethal forms of self-poisoning worldwide. Upon contact with moisture or gastric acid, AlP liberates '''phosphine gas (PH₃)''', which inhibits mitochondrial cytochrome C oxidase, causing profound cellular hypoxia, refractory cardiovascular collapse, and multiorgan failure.<ref name="Gurjar2011">Gurjar M, et al. Managing aluminum phosphide poisonings. ''J Emerg Trauma Shock''. 2011;4(3):378-384. doi:10.4103/0974-2700....") |
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==Background== | ==Background== | ||
*Aluminum phosphide is sold as tablets or pellets (3 g each, containing approximately 56% AlP) under trade names including | *Aluminum phosphide (AlP) poisoning is one of the most lethal forms of self-poisoning worldwide. | ||
*Known colloquially as | *Upon contact with moisture or gastric acid, AlP liberates phosphine gas (PH₃), which inhibits mitochondrial cytochrome C oxidase, causing profound cellular hypoxia, refractory cardiovascular collapse, and multiorgan failure.<ref name="Gurjar2011">Gurjar M, et al. Managing aluminum phosphide poisonings. ''J Emerg Trauma Shock''. 2011;4(3):378-384. doi:10.4103/0974-2700.83868</ref> There is no specific antidote; mortality ranges from 37-100%.<ref name="Wahab2008">Wahab A, Zaheer MS, Wahab S, Khan RA. Acute aluminium phosphide poisoning: an update. ''Hong Kong J Emerg Med''. 2008;15:152-155.</ref> | ||
*Aluminum phosphide is sold as tablets or pellets (3 g each, containing approximately 56% AlP) under trade names including Celphos, Quickphos, Phostoxin, and Fumitoxin | |||
*Known colloquially as "rice tablet" in parts of India and Iran | |||
*Used worldwide as a grain fumigant and rodenticide, especially in developing countries | *Used worldwide as a grain fumigant and rodenticide, especially in developing countries | ||
*AlP is | *AlP is unstable — releases phosphine gas rapidly on contact with moisture, making it more acutely lethal than [[Zinc phosphide poisoning|zinc phosphide]]<ref name="Trakul2017">Trakulsrichai S, et al. Clinical characteristics of zinc phosphide poisoning in Thailand. ''Ther Clin Risk Manag''. 2017;13:335-340.</ref> | ||
* | * Lethal dose: 150-500 mg (as little as one-tenth of a standard 3 g tablet can be fatal)<ref name="Gurjar2011"/> | ||
*Deaths from cardiovascular toxicity typically occur within the '''first 12-24 hours'''<ref name="Turkmen2016">Turkmen YH, et al. Successful Management of Aluminium Phosphide Poisoning Resulting in Cardiac Arrest. ''Turk J Anaesthesiol Reanim''. 2016;44(3):155-157. doi:10.5152/TJAR.2016.96168</ref> | *Deaths from cardiovascular toxicity typically occur within the '''first 12-24 hours'''<ref name="Turkmen2016">Turkmen YH, et al. Successful Management of Aluminium Phosphide Poisoning Resulting in Cardiac Arrest. ''Turk J Anaesthesiol Reanim''. 2016;44(3):155-157. doi:10.5152/TJAR.2016.96168</ref> | ||
*Most poisoning cases are | *Most poisoning cases are intentional (self-harm) in young adults in agricultural regions of South Asia, the Middle East, and Africa<ref name="Ethiopia2021">Teshome Z, et al. Clinical Profile and Treatment Outcome of Aluminum Phosphide Poisoning in Felege Hiwot Referral Hospital, Northwest Ethiopia. ''Open Access Emerg Med''. 2021;13:223-230. doi:10.2147/OAEM.S313181</ref> | ||
===Mechanism of toxicity=== | ===Mechanism of toxicity=== | ||
*AlP + gastric HCl/moisture → | *AlP + gastric HCl/moisture → phosphine gas (PH₃) | ||
*Phosphine inhibits | *Phosphine inhibits cytochrome C oxidase (complex IV of mitochondrial electron transport chain) → blocks oxidative phosphorylation → cellular energy crisis<ref name="Gurjar2011"/> | ||
*Generates highly reactive | *Generates highly reactive hydroxyl radicals → lipid peroxidation, glutathione depletion → oxidative cellular injury | ||
* | * Myocardium is the primary target — cell membrane dysfunction, impaired glucose utilization, oxidative stress → cardiogenic shock (most common cause of death)<ref name="Nature2025">Aluminum phosphide poisoning and its clinical management. ''Nature Research Intelligence''. 2025.</ref> | ||
*Also targets lungs, liver, kidneys, adrenals, and GI tract | *Also targets lungs, liver, kidneys, adrenals, and GI tract | ||
*Phosphine may also be | *Phosphine may also be exhaled by the patient and released from vomitus — posing a risk to healthcare workers | ||
===Healthcare worker safety=== | ===Healthcare worker safety=== | ||
* | * Phosphine gas is hazardous to staff — vomitus, gastric aspirate, and exhaled air may contain phosphine | ||
*Treat in a | *Treat in a well-ventilated area or negative-pressure room | ||
*PPE including respiratory protection is recommended | *PPE including respiratory protection is recommended | ||
*Exposure at 1400 mg/m³ for 30 minutes can be fatal<ref name="Turkmen2016"/> | *Exposure at 1400 mg/m³ for 30 minutes can be fatal<ref name="Turkmen2016"/> | ||
| Line 26: | Line 26: | ||
==Clinical features== | ==Clinical features== | ||
*Onset is | *Onset is rapid (minutes to hours), in contrast to the more delayed presentation of zinc phosphide<ref name="Trakul2017"/> | ||
*The cardinal feature is | *The cardinal feature is profound, refractory hypotension (present in 50-100% of severe cases)<ref name="Gurjar2011"/> | ||
===Gastrointestinal=== | ===Gastrointestinal=== | ||
| Line 34: | Line 34: | ||
*Diarrhea | *Diarrhea | ||
*Hematemesis (from erosive gastropathy) | *Hematemesis (from erosive gastropathy) | ||
* | * Garlic or decaying fish odor from breath/vomitus (classic but not always present) | ||
===Cardiovascular (primary cause of mortality)=== | ===Cardiovascular (primary cause of mortality)=== | ||
* | * Refractory hypotension and [[Cardiogenic shock|cardiogenic shock]] | ||
*Myocarditis, pericarditis, subendocardial infarction | *Myocarditis, pericarditis, subendocardial infarction | ||
*ECG abnormalities: ST-segment elevation/depression, T-wave inversion, | *ECG abnormalities: ST-segment elevation/depression, T-wave inversion, QTc prolongation, conduction blocks, ventricular tachycardia, atrial fibrillation<ref name="Gurjar2011"/> | ||
* | * Cardiac arrest (often within 12-24 hours of ingestion) | ||
*Elevated troponin | *Elevated troponin | ||
| Line 50: | Line 50: | ||
===Metabolic=== | ===Metabolic=== | ||
* | * Severe metabolic acidosis (high anion gap; elevated lactate) — most sensitive marker of severity and strongest predictor of mortality<ref name="Gurjar2011"/> | ||
*Hyperkalemia (from cellular injury and acidosis) | *Hyperkalemia (from cellular injury and acidosis) | ||
*Hypomagnesemia (associated with increased mortality) | *Hypomagnesemia (associated with increased mortality) | ||
| Line 83: | Line 83: | ||
*[[Cyanide poisoning]] (similar mechanism of cytochrome oxidase inhibition) | *[[Cyanide poisoning]] (similar mechanism of cytochrome oxidase inhibition) | ||
*[[Calcium channel blocker toxicity]] (refractory hypotension with cardiogenic shock) | *[[Calcium channel blocker toxicity]] (refractory hypotension with cardiogenic shock) | ||
{{Toxic gas exposure DDX}} | |||
==Evaluation== | ==Evaluation== | ||
===Workup=== | ===Workup=== | ||
* | * Silver nitrate test: simple bedside diagnostic test<ref name="Gurjar2011"/> | ||
**Expose filter paper impregnated with silver nitrate solution to the patient's gastric aspirate, vomitus, or exhaled breath | **Expose filter paper impregnated with silver nitrate solution to the patient's gastric aspirate, vomitus, or exhaled breath | ||
**Positive test: paper turns | **Positive test: paper turns black (silver phosphide formation) — confirms phosphine exposure | ||
* | * ABG/VBG: metabolic acidosis with elevated lactate — severity correlates directly with mortality | ||
* | * ECG: continuous monitoring; look for ST changes, QTc prolongation, arrhythmias, conduction blocks | ||
* | * CBC, BMP, hepatic function panel, coagulation studies (PT/INR) | ||
* | * Cardiac biomarkers: troponin (serial), BNP | ||
* | * Serum magnesium, calcium, phosphorus | ||
* | * Blood glucose (monitor frequently; hypoglycemia is a poor prognostic indicator) | ||
* | * Chest radiograph: pulmonary edema, ARDS | ||
* | * Echocardiography: assess myocardial function; may show global hypokinesis in severe myocarditis | ||
* | * Abdominal radiograph: AlP tablets are not reliably radiopaque (unlike zinc phosphide) | ||
* | * Methemoglobin level if cyanosis present | ||
* | * Salicylate, acetaminophen, ethanol levels if intentional co-ingestion suspected | ||
===Diagnosis=== | ===Diagnosis=== | ||
*Primarily clinical: history of ingestion of fumigant/rodenticide tablet + garlic odor + rapid-onset refractory shock + metabolic acidosis | *Primarily clinical: history of ingestion of fumigant/rodenticide tablet + garlic odor + rapid-onset refractory shock + metabolic acidosis | ||
* | * Silver nitrate test on gastric aspirate or breath is the most accessible confirmatory test | ||
*Phosphine gas levels are not routinely available | *Phosphine gas levels are not routinely available | ||
* | * Poor prognostic indicators:<ref name="Gurjar2011"/><ref name="Ethiopia2021"/> | ||
**Shock or hypotension at presentation | **Shock or hypotension at presentation | ||
**Severe metabolic acidosis (pH <7.2) or elevated lactate | **Severe metabolic acidosis (pH <7.2) or elevated lactate | ||
| Line 115: | Line 118: | ||
==Management== | ==Management== | ||
No specific antidote exists. Management is aggressive supportive care and GI decontamination.<ref name="Gurjar2011"/> | |||
===GI decontamination=== | ===GI decontamination=== | ||
* | * Gastric lavage with potassium permanganate (KMnO₄ 1:10,000) — oxidizes phosphine to non-toxic phosphate<ref name="Gurjar2011"/> | ||
* | * Coconut oil (100-200 mL via NG tube) — forms a protective mucosal barrier and may reduce phosphine liberation; reported to decrease absorption even up to 6 hours after ingestion<ref name="Shadnia2005">Shadnia S, et al. Successful treatment of acute aluminium phosphide poisoning: possible benefit of coconut oil. ''Hum Exp Toxicol''. 2005;24(4):215-218.</ref> | ||
* | * Sodium bicarbonate (NaHCO₃ 7.5%) added to lavage fluid — neutralizes gastric acid to reduce phosphide-to-phosphine conversion<ref name="Agrawal2015">Agrawal VK, et al. Aluminum phosphide poisoning: possible role of supportive measures in the absence of specific antidote. ''Indian J Crit Care Med''. 2015;19(2):113-115. doi:10.4103/0972-5229.151019</ref> | ||
*'''Do NOT use plain water''' for lavage — promotes phosphine gas formation | *'''Do NOT use plain water''' for lavage — promotes phosphine gas formation | ||
* | * Activated charcoal: limited evidence of benefit (phosphine is a gas and poorly adsorbed); may be given if co-ingestant suspected | ||
*'''Do NOT induce emesis''' — re-exposure risk and aspiration hazard | *'''Do NOT induce emesis''' — re-exposure risk and aspiration hazard | ||
===Cardiovascular support (core of management)=== | ===Cardiovascular support (core of management)=== | ||
* | * Aggressive IV fluid resuscitation | ||
* | * Vasopressors: norepinephrine or dopamine for refractory hypotension; high doses frequently required<ref name="Gurjar2011"/> | ||
* | * Intra-aortic balloon pump (IABP): case reports of use as rescue therapy for refractory cardiogenic shock<ref name="Siddaiah2009">Siddaiah L, et al. Intra-aortic balloon pump in toxic myocarditis due to aluminium phosphide poisoning. ''J Med Toxicol''. 2009;5(2):80-83.</ref> | ||
* | * Hyperinsulinemia-euglycemia therapy (HIE): emerging evidence suggests benefit by shifting myocardial metabolism from beta-oxidation to glycolysis, improving contractility<ref name="Nature2025"/> | ||
**Insulin 1 IU/kg/h with dextrose infusion to maintain euglycemia | **Insulin 1 IU/kg/h with dextrose infusion to maintain euglycemia | ||
* | * ECMO (extracorporeal membrane oxygenation): may be considered as bridge therapy in refractory cardiogenic shock in centers with capability | ||
* | * Continuous cardiac monitoring — arrhythmias are common and frequently fatal | ||
*For | *For ventricular tachycardia or [[Torsades de pointes]]: magnesium sulfate, lidocaine, defibrillation | ||
** | ** Avoid class IA (procainamide, quinidine), IC, and III antiarrhythmics — risk of further QTc prolongation | ||
===Magnesium sulfate=== | ===Magnesium sulfate=== | ||
* | * IV magnesium sulfate — membrane stabilizer, antioxidant (restores glutathione), cardioprotective<ref name="Gurjar2011"/> | ||
*Multiple dosing regimens described; one protocol: 1 g IV q1h for 3 hours, then 6 g/day infusion for 3-5 days<ref name="Agrawal2015"/> | *Multiple dosing regimens described; one protocol: 1 g IV q1h for 3 hours, then 6 g/day infusion for 3-5 days<ref name="Agrawal2015"/> | ||
*Studies suggest improved survival, particularly in patients with hypomagnesemia<ref name="Gurjar2011"/> | *Studies suggest improved survival, particularly in patients with hypomagnesemia<ref name="Gurjar2011"/> | ||
| Line 148: | Line 151: | ||
===Antioxidant therapy=== | ===Antioxidant therapy=== | ||
* | * N-acetylcysteine (NAC): hepatoprotective, replenishes glutathione; loading dose 140 mg/kg, maintenance 70 mg/kg for 17 additional doses<ref name="Nature2025"/> | ||
* | * Vitamin C: 1 g IV q8h (antioxidant; limited evidence) | ||
* | * Vitamin E: 100 IU q12h (antioxidant; limited evidence) | ||
===Additional supportive measures=== | ===Additional supportive measures=== | ||
* | * Hydrocortisone: IV stress-dose steroids for refractory shock (relative adrenal insufficiency may contribute)<ref name="Ethiopia2021"/> | ||
* | * Calcium gluconate: for hypocalcemia | ||
* | * Hemodialysis: not effective at removing phosphine (protein-bound), but essential for supportive management of AKI, hyperkalemia, and refractory acidosis<ref name="Turkmen2016"/> | ||
* | * Blood products: as needed for coagulopathy/DIC | ||
* | * Intubation and mechanical ventilation for respiratory failure | ||
==Medication Dosing== | |||
{{MedicationDose | |||
| drug = Magnesium sulfate | |||
| dose = 4g IV over 20min, then 6g over 12hr infusion | |||
| route = IV | |||
| context = Cardioprotective, may reduce mortality | |||
| indication = Aluminum phosphide poisoning | |||
| population = Adult | |||
}} | |||
{{MedicationDose | |||
| drug = Sodium bicarbonate | |||
| dose = 1-2mEq/kg IV bolus, then infusion to maintain pH >7.2 | |||
| route = IV | |||
| context = Correct metabolic acidosis | |||
| indication = Aluminum phosphide poisoning | |||
| population = Adult | |||
}} | |||
==Disposition== | ==Disposition== | ||
*'''All patients with confirmed or suspected AlP ingestion must be admitted to the ICU''' — even if initially stable<ref name="Gurjar2011"/> | *'''All patients with confirmed or suspected AlP ingestion must be admitted to the ICU''' — even if initially stable<ref name="Gurjar2011"/> | ||
* | * Continuous cardiac monitoring for a minimum of 72 hours — most deaths occur within 12-24 hours, but delayed deterioration can occur | ||
*Serial ABGs, ECGs, cardiac biomarkers, LFTs, renal function, electrolytes, and blood glucose every 4-6 hours during the first 48 hours | *Serial ABGs, ECGs, cardiac biomarkers, LFTs, renal function, electrolytes, and blood glucose every 4-6 hours during the first 48 hours | ||
* | * Death typically occurs from refractory cardiogenic shock within 24 hours in severe cases<ref name="Turkmen2016"/> | ||
*Survivors of the acute phase generally recover fully if organ failure is supported | *Survivors of the acute phase generally recover fully if organ failure is supported | ||
* | * All intentional ingestions: psychiatric evaluation mandatory prior to discharge | ||
*Contact [[Poison control]] (1-800-222-1222 in the US) for all cases | *Contact [[Poison control]] (1-800-222-1222 in the US) for all cases | ||
*Key differences from [[Zinc phosphide poisoning|zinc phosphide poisoning]]: | *Key differences from [[Zinc phosphide poisoning|zinc phosphide poisoning]]: | ||
Latest revision as of 09:30, 22 March 2026
Background
- Aluminum phosphide (AlP) poisoning is one of the most lethal forms of self-poisoning worldwide.
- Upon contact with moisture or gastric acid, AlP liberates phosphine gas (PH₃), which inhibits mitochondrial cytochrome C oxidase, causing profound cellular hypoxia, refractory cardiovascular collapse, and multiorgan failure.[1] There is no specific antidote; mortality ranges from 37-100%.[2]
- Aluminum phosphide is sold as tablets or pellets (3 g each, containing approximately 56% AlP) under trade names including Celphos, Quickphos, Phostoxin, and Fumitoxin
- Known colloquially as "rice tablet" in parts of India and Iran
- Used worldwide as a grain fumigant and rodenticide, especially in developing countries
- AlP is unstable — releases phosphine gas rapidly on contact with moisture, making it more acutely lethal than zinc phosphide[3]
- Lethal dose: 150-500 mg (as little as one-tenth of a standard 3 g tablet can be fatal)[1]
- Deaths from cardiovascular toxicity typically occur within the first 12-24 hours[4]
- Most poisoning cases are intentional (self-harm) in young adults in agricultural regions of South Asia, the Middle East, and Africa[5]
Mechanism of toxicity
- AlP + gastric HCl/moisture → phosphine gas (PH₃)
- Phosphine inhibits cytochrome C oxidase (complex IV of mitochondrial electron transport chain) → blocks oxidative phosphorylation → cellular energy crisis[1]
- Generates highly reactive hydroxyl radicals → lipid peroxidation, glutathione depletion → oxidative cellular injury
- Myocardium is the primary target — cell membrane dysfunction, impaired glucose utilization, oxidative stress → cardiogenic shock (most common cause of death)[6]
- Also targets lungs, liver, kidneys, adrenals, and GI tract
- Phosphine may also be exhaled by the patient and released from vomitus — posing a risk to healthcare workers
Healthcare worker safety
- Phosphine gas is hazardous to staff — vomitus, gastric aspirate, and exhaled air may contain phosphine
- Treat in a well-ventilated area or negative-pressure room
- PPE including respiratory protection is recommended
- Exposure at 1400 mg/m³ for 30 minutes can be fatal[4]
- Handle gastric lavage effluent as hazardous material
Clinical features
- Onset is rapid (minutes to hours), in contrast to the more delayed presentation of zinc phosphide[3]
- The cardinal feature is profound, refractory hypotension (present in 50-100% of severe cases)[1]
Gastrointestinal
- Nausea, vomiting (most common presenting symptom; 74% of cases)[5]
- Severe epigastric and abdominal pain
- Diarrhea
- Hematemesis (from erosive gastropathy)
- Garlic or decaying fish odor from breath/vomitus (classic but not always present)
Cardiovascular (primary cause of mortality)
- Refractory hypotension and cardiogenic shock
- Myocarditis, pericarditis, subendocardial infarction
- ECG abnormalities: ST-segment elevation/depression, T-wave inversion, QTc prolongation, conduction blocks, ventricular tachycardia, atrial fibrillation[1]
- Cardiac arrest (often within 12-24 hours of ingestion)
- Elevated troponin
Respiratory
- Dyspnea, tachypnea
- Acute pulmonary edema (cardiogenic and non-cardiogenic)
- ARDS
- Respiratory failure requiring intubation
Metabolic
- Severe metabolic acidosis (high anion gap; elevated lactate) — most sensitive marker of severity and strongest predictor of mortality[1]
- Hyperkalemia (from cellular injury and acidosis)
- Hypomagnesemia (associated with increased mortality)
- Hypoglycemia (poor prognostic sign)
Hepatic
- Hepatocellular injury (elevated AST, ALT)
- Hepatic failure with coagulopathy
Renal
- Acute kidney injury
- Oliguria/anuria
Neurologic
- Agitation, restlessness, anxiety
- Altered mental status, delirium, coma
- Seizures
Other
- Methemoglobinemia (less common)
- Disseminated intravascular coagulation
- Adrenal insufficiency
Differential diagnosis
- Zinc phosphide poisoning (slower onset, lower mortality)
- Organophosphate poisoning
- Acute myocardial infarction or myocarditis (other causes)
- Septic shock
- Acute gastroenteritis (early presentation)
- Iron toxicity
- Arsenic poisoning
- Cyanide poisoning (similar mechanism of cytochrome oxidase inhibition)
- Calcium channel blocker toxicity (refractory hypotension with cardiogenic shock)
Toxic gas exposure
- Carbon monoxide toxicity
- Chemical weapons
- Cyanide toxicity
- Dichloromethane toxicity
- Hydrocarbon toxicity
- Hydrogen sulfide toxicity
- Inhalant abuse
- Methane toxicity
- Smoke inhalation injury
- Ethylene dibromide toxicity
Evaluation
Workup
- Silver nitrate test: simple bedside diagnostic test[1]
- Expose filter paper impregnated with silver nitrate solution to the patient's gastric aspirate, vomitus, or exhaled breath
- Positive test: paper turns black (silver phosphide formation) — confirms phosphine exposure
- ABG/VBG: metabolic acidosis with elevated lactate — severity correlates directly with mortality
- ECG: continuous monitoring; look for ST changes, QTc prolongation, arrhythmias, conduction blocks
- CBC, BMP, hepatic function panel, coagulation studies (PT/INR)
- Cardiac biomarkers: troponin (serial), BNP
- Serum magnesium, calcium, phosphorus
- Blood glucose (monitor frequently; hypoglycemia is a poor prognostic indicator)
- Chest radiograph: pulmonary edema, ARDS
- Echocardiography: assess myocardial function; may show global hypokinesis in severe myocarditis
- Abdominal radiograph: AlP tablets are not reliably radiopaque (unlike zinc phosphide)
- Methemoglobin level if cyanosis present
- Salicylate, acetaminophen, ethanol levels if intentional co-ingestion suspected
Diagnosis
- Primarily clinical: history of ingestion of fumigant/rodenticide tablet + garlic odor + rapid-onset refractory shock + metabolic acidosis
- Silver nitrate test on gastric aspirate or breath is the most accessible confirmatory test
- Phosphine gas levels are not routinely available
- Poor prognostic indicators:[1][5]
- Shock or hypotension at presentation
- Severe metabolic acidosis (pH <7.2) or elevated lactate
- Cardiac arrhythmias
- Hyperkalemia
- Hypoglycemia
- Need for vasopressors or mechanical ventilation
- Amount ingested >1.5 g
Management
No specific antidote exists. Management is aggressive supportive care and GI decontamination.[1]
GI decontamination
- Gastric lavage with potassium permanganate (KMnO₄ 1:10,000) — oxidizes phosphine to non-toxic phosphate[1]
- Coconut oil (100-200 mL via NG tube) — forms a protective mucosal barrier and may reduce phosphine liberation; reported to decrease absorption even up to 6 hours after ingestion[7]
- Sodium bicarbonate (NaHCO₃ 7.5%) added to lavage fluid — neutralizes gastric acid to reduce phosphide-to-phosphine conversion[8]
- Do NOT use plain water for lavage — promotes phosphine gas formation
- Activated charcoal: limited evidence of benefit (phosphine is a gas and poorly adsorbed); may be given if co-ingestant suspected
- Do NOT induce emesis — re-exposure risk and aspiration hazard
Cardiovascular support (core of management)
- Aggressive IV fluid resuscitation
- Vasopressors: norepinephrine or dopamine for refractory hypotension; high doses frequently required[1]
- Intra-aortic balloon pump (IABP): case reports of use as rescue therapy for refractory cardiogenic shock[9]
- Hyperinsulinemia-euglycemia therapy (HIE): emerging evidence suggests benefit by shifting myocardial metabolism from beta-oxidation to glycolysis, improving contractility[6]
- Insulin 1 IU/kg/h with dextrose infusion to maintain euglycemia
- ECMO (extracorporeal membrane oxygenation): may be considered as bridge therapy in refractory cardiogenic shock in centers with capability
- Continuous cardiac monitoring — arrhythmias are common and frequently fatal
- For ventricular tachycardia or Torsades de pointes: magnesium sulfate, lidocaine, defibrillation
- Avoid class IA (procainamide, quinidine), IC, and III antiarrhythmics — risk of further QTc prolongation
Magnesium sulfate
- IV magnesium sulfate — membrane stabilizer, antioxidant (restores glutathione), cardioprotective[1]
- Multiple dosing regimens described; one protocol: 1 g IV q1h for 3 hours, then 6 g/day infusion for 3-5 days[8]
- Studies suggest improved survival, particularly in patients with hypomagnesemia[1]
- Monitor for magnesium toxicity (loss of DTRs, respiratory depression)
Sodium bicarbonate
- IV sodium bicarbonate for correction of metabolic acidosis
- Also used in gastric lavage (see above)
- May help stabilize myocardial membranes
Antioxidant therapy
- N-acetylcysteine (NAC): hepatoprotective, replenishes glutathione; loading dose 140 mg/kg, maintenance 70 mg/kg for 17 additional doses[6]
- Vitamin C: 1 g IV q8h (antioxidant; limited evidence)
- Vitamin E: 100 IU q12h (antioxidant; limited evidence)
Additional supportive measures
- Hydrocortisone: IV stress-dose steroids for refractory shock (relative adrenal insufficiency may contribute)[5]
- Calcium gluconate: for hypocalcemia
- Hemodialysis: not effective at removing phosphine (protein-bound), but essential for supportive management of AKI, hyperkalemia, and refractory acidosis[4]
- Blood products: as needed for coagulopathy/DIC
- Intubation and mechanical ventilation for respiratory failure
Medication Dosing
Magnesium sulfate 4g IV over 20min, then 6g over 12hr infusion IV Sodium bicarbonate 1-2mEq/kg IV bolus, then infusion to maintain pH >7.2 IV
Disposition
- All patients with confirmed or suspected AlP ingestion must be admitted to the ICU — even if initially stable[1]
- Continuous cardiac monitoring for a minimum of 72 hours — most deaths occur within 12-24 hours, but delayed deterioration can occur
- Serial ABGs, ECGs, cardiac biomarkers, LFTs, renal function, electrolytes, and blood glucose every 4-6 hours during the first 48 hours
- Death typically occurs from refractory cardiogenic shock within 24 hours in severe cases[4]
- Survivors of the acute phase generally recover fully if organ failure is supported
- All intentional ingestions: psychiatric evaluation mandatory prior to discharge
- Contact Poison control (1-800-222-1222 in the US) for all cases
- Key differences from zinc phosphide poisoning:
| Feature | Aluminum phosphide | Zinc phosphide |
|---|---|---|
| Onset of systemic toxicity | Rapid (minutes to hours) | Delayed (hours to >12 hours) |
| Stability of compound | Unstable; rapid phosphine release | Relatively stable |
| Radiopaque on X-ray | No (not reliably) | Yes (zinc component) |
| Mortality rate | Higher (37-100%) | Lower (~7-37%) |
| Primary cause of death | Cardiogenic shock | Cardiogenic shock/hepatic failure |
| Hepatic failure | Less prominent | More prominent (delayed) |
See Also
- Zinc phosphide poisoning
- Organophosphate poisoning
- Cyanide poisoning
- Carbon monoxide poisoning
- Calcium channel blocker toxicity
- Methemoglobinemia
- Cardiogenic shock
- Acute kidney injury
- Torsades de pointes
External Links
- J Emerg Trauma Shock — Managing aluminum phosphide poisonings (2011)
- Indian J Crit Care Med — Aluminum phosphide poisoning: possible role of supportive measures (2015)
- Turk J Anaesthesiol Reanim — Successful Management of AlP Poisoning Resulting in Cardiac Arrest (2016)
- Open Access Emerg Med — Clinical Profile and Treatment Outcome of AlP Poisoning, Ethiopia (2021)
- Turk J Emerg Med — Aluminum phosphide: Toxicological profiles, health risks, and management protocols (2025)
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 Gurjar M, et al. Managing aluminum phosphide poisonings. J Emerg Trauma Shock. 2011;4(3):378-384. doi:10.4103/0974-2700.83868
- ↑ Wahab A, Zaheer MS, Wahab S, Khan RA. Acute aluminium phosphide poisoning: an update. Hong Kong J Emerg Med. 2008;15:152-155.
- ↑ 3.0 3.1 Trakulsrichai S, et al. Clinical characteristics of zinc phosphide poisoning in Thailand. Ther Clin Risk Manag. 2017;13:335-340.
- ↑ 4.0 4.1 4.2 4.3 Turkmen YH, et al. Successful Management of Aluminium Phosphide Poisoning Resulting in Cardiac Arrest. Turk J Anaesthesiol Reanim. 2016;44(3):155-157. doi:10.5152/TJAR.2016.96168
- ↑ 5.0 5.1 5.2 5.3 Teshome Z, et al. Clinical Profile and Treatment Outcome of Aluminum Phosphide Poisoning in Felege Hiwot Referral Hospital, Northwest Ethiopia. Open Access Emerg Med. 2021;13:223-230. doi:10.2147/OAEM.S313181
- ↑ 6.0 6.1 6.2 Aluminum phosphide poisoning and its clinical management. Nature Research Intelligence. 2025.
- ↑ Shadnia S, et al. Successful treatment of acute aluminium phosphide poisoning: possible benefit of coconut oil. Hum Exp Toxicol. 2005;24(4):215-218.
- ↑ 8.0 8.1 Agrawal VK, et al. Aluminum phosphide poisoning: possible role of supportive measures in the absence of specific antidote. Indian J Crit Care Med. 2015;19(2):113-115. doi:10.4103/0972-5229.151019
- ↑ Siddaiah L, et al. Intra-aortic balloon pump in toxic myocarditis due to aluminium phosphide poisoning. J Med Toxicol. 2009;5(2):80-83.