Complications of Celphos (Aluminum and Zinc Phosphide) Poisoning
Celphos poisoning causes severe multiorgan failure with cardiovascular collapse, refractory shock, metabolic acidosis, acute kidney injury, hepatotoxicity, and cardiac arrhythmias, with mortality rates ranging from 30-100% depending on dose ingested.
Cardiovascular Complications
The most lethal complications involve the cardiovascular system:
- Refractory cardiogenic shock that is often unresponsive to standard vasopressor therapy 1
- Severe hypotension resistant to dopamine, representing the dominant clinical feature 1
- Cardiac arrhythmias including ventricular tachycardia and ventricular arrhythmias 2, 3
- Myocarditis with cardiac enzyme elevation 4
- Cardiovascular collapse leading to death, particularly in the first 12-24 hours 4
The mechanism involves phosphine gas (released when phosphide contacts gastric acid) inhibiting cytochrome C oxidase, causing cellular hypoxia and mitochondrial toxicity 4, 5.
Renal Complications
Kidney injury is a major complication:
- Severe acute kidney injury (AKI) with acute tubular necrosis 2, 3, 4
- Tubulointerstitial nephritis documented on renal biopsy 4
- Subnephrotic range proteinuria 4
- Elevated creatinine and blood urea nitrogen 6
Patients often require hemodialysis or continuous renal replacement therapy (CRRT) for extended periods (up to 24 days documented) 3, 4.
Hepatic Complications
Liver damage manifests as:
- Elevated liver enzymes (AST, ALT, ALP) 4, 6
- Hyperbilirubinemia 4
- Hypoalbuminemia 4
- Hepatic congestion and patchy necrosis on autopsy 1
- Low pseudocholinesterase levels (706 U/L documented) 7
The development of coagulopathy and elevated liver enzymes predicts poorer outcomes 4.
Metabolic Complications
Critical metabolic derangements include:
- Severe metabolic acidosis (often mixed acidosis) 2, 7, 3
- Hypokalemia 7
- Hypocalcemia 7
- Hyperglycemia (associated with worse prognosis) 4
Respiratory Complications
Pulmonary involvement includes:
- Respiratory failure requiring mechanical ventilation 3
- Lung atelectasis 7
- Adult respiratory distress syndrome (ARDS) as a cause of late death (beyond 24 hours) 4
- Secondary bacterial pneumonia from phosphine-induced atelectasis 7
Gastrointestinal Complications
- Severe vomiting (more common in survivors) 1
- Epigastric pain and diarrhea 3
- Acute pancreatitis 4
- Thickening of jejunal wall 7
- Gastrointestinal tract congestion 1
Hematologic and Inflammatory Complications
Neurological Complications
- Decreased consciousness 7
- Dizziness 3
- Central nervous system depression 8
- Brain congestion on autopsy 1
Critical Prognostic Factors
Mortality predictors include:
- Dose ingested (fatal dose as low as 1.5 g of aluminum phosphide) 1
- Development of multiorgan failure 4
- Coagulopathy 4
- Hyperglycemia 4
- Elevated liver enzymes 4
Timing of death:
- Early deaths (12-24 hours): refractory hypotension and arrhythmias 4
- Late deaths (beyond 24 hours): ARDS, liver failure, and renal failure 4
Management Considerations
There is no specific antidote 5, 9. For severe cases with refractory cardiogenic shock or cardiac arrest, VA-ECMO is reasonable when other treatment measures fail 8. ECMO support for up to 16 days has been documented with complete recovery 3.
Common pitfall: Delayed presentation significantly worsens outcomes, yet time elapsed between ingestion and hospital arrival does not independently predict mortality—the dose ingested is the critical factor 1.
The high mortality (70-100% with ingestion of 150-500 mg) 2 and lack of effective antidote make early aggressive supportive care, intensive monitoring, and consideration for ECMO in tertiary centers essential 3.