LTSI consensus guidelines for the management of acute liver injury caused by yellow phosphorus

The Liver Transplant Society of India (LTSI) consensus guidelines for the management of acute liver injury (ALI) caused by yellow phosphorus (YP) poisoning emphasize the critical need for early recognition, hospitalization, supportive care, and timely referral for liver transplantation (LT), given the high mortality associated with this condition. Below are the key recommendations and management principles derived from the guidelines:

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### **1. Clinical Importance and Patient Demographics**

• **High Mortality:** Yellow phosphorus poisoning is a significant cause of acute liver failure (ALF) in India, with mortality rates ranging from 20%–30%.
• **Target Population:** Most cases involve young adults (20s–40s) due to suicidal ingestion, though pediatric accidental exposures and poisoning via fireworks are also reported.

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### **2. Toxic Mechanisms**

• Yellow phosphorus causes hepatotoxicity through:
• Mitochondrial damage.
• Inhibition of oxidative phosphorylation and ATP depletion.
• Disruption of protein synthesis.
• Other affected organs include the bone marrow, heart, pancreas, and muscles.

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### **3. Clinical Course**

YP poisoning progresses through three overlapping phases:

1. **Early Phase:** Gastrointestinal symptoms such as vomiting and abdominal pain.

2. **Quiescent Phase:** Silent biochemical injury without overt symptoms.

3. **Toxic Hepatitis and Multiorgan Failure:** Develops typically after day 4, with rapid deterioration.

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### **4. Early Hospitalization**

• **Mandatory Admission:** All patients with suspected or confirmed YP ingestion should be hospitalized, even if asymptomatic initially, as silent liver injury can progress to ALF.

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### **5. Initial Management**

• **Supportive Care:**
• Correct fluid and electrolyte imbalances.
• Administer vitamin K to counteract anticoagulant effects (common in rodenticides).
• Consider early initiation of **N-acetylcysteine (NAC)**.
• **Gastric Lavage:** Not recommended due to risks of aspiration and chemical burns.
• **Activated Charcoal:** May be used within hours of ingestion to reduce toxin absorption.

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### **6. Role of N-Acetylcysteine (NAC)**

• NAC improves outcomes if started early (ideally within 6 hours of ingestion).
• Delayed initiation reduces its efficacy but is still beneficial in mitigating liver injury.

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### **7. Discharge Criteria**

• Patients can be discharged if:
• They do not develop acute liver injury within 5 days of ingestion.
• They recover clinically and biochemically.
• Close outpatient follow-up is essential.

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### **8. Intensive Care Unit (ICU) Admission**

• ICU monitoring is required for any evidence of organ injury.
• Monitor for:
• Encephalopathy.
• Worsening INR.
• Renal dysfunction.

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### **9. Referral to Liver Transplantation Units**

• **Early Referral:** Contact a liver transplant center as soon as ALF or significant liver injury is suspected.
• **Timely Transfer:** Delay in transfer reduces survival chances.
• The decision depends on:
• Disease severity.
• Local resources.
• Travel logistics.

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### **10. Extracorporeal Therapies**

• **Therapeutic Plasma Exchange (TPE):**
• Reduces toxin load and may improve transplant-free survival.
• Practices regarding timing, dosing, and stopping criteria vary among centers.
• Multicenter trials are needed to standardize its use.
• **Renal Replacement Therapy (RRT):**
• Essential for managing acute kidney injury (AKI) caused by direct toxicity or rhabdomyolysis.
• Helps control ammonia levels and provides renal support.

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### **11. Liver Transplantation (LT)**

• **Indications for LT:**
• Classic King’s College Criteria (KCC) are less predictive in YP poisoning.
• Predictors include:
• Encephalopathy ≥ grade 2.
• MELD score ≥ 36.
• INR > 6.
• INR > 2.5 after 2 TPE cycles.
• Encephalopathy ≥ grade 2 is considered the single most important predictor of irreversible liver injury and is the primary criterion for urgent LT listing.
• **Contraindications for LT:**
• Irreversible neurological damage is the only absolute contraindication.
• Other organ failures may recover post-LT, especially in young patients.
• **Type of LT:**
• Both living donor and deceased donor liver transplants are viable.
• Auxiliary transplants are associated with poorer outcomes, so standard orthotopic LT is preferred.

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### **12. Medicolegal and Counseling Aspects**

• All YP poisonings are medicolegal cases.
• Physicians must:
• Ensure proper documentation and reporting to legal authorities.
• Provide psychological counseling for patients and families.
• Offer post-discharge mental health support to address suicidal tendencies or accidental exposures.

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### **13. Summary of Key Management Steps**

1. **Early Recognition and Admission:**

• Hospitalize all patients with YP ingestion, even if asymptomatic.

2. **Supportive Care:**

• Correct fluids, electrolytes, and coagulation parameters.
• Initiate NAC early.

3. **Monitor Progression:**

• Watch for signs of liver injury, encephalopathy, and multi-organ failure.

4. **Referral to LT Centers:**

• Initiate early contact with transplant centers for timely intervention.

5. **Extracorporeal Therapies:**

• Use TPE and RRT as needed for toxin removal and renal support.

6. **Liver Transplantation:**

• Assess for LT based on encephalopathy and other predictors.

7. **Post-Discharge Care:**

• Ensure close follow-up and mental health support.

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The LTSI guidelines highlight the importance of a multidisciplinary approach involving hepatologists, intensivists, transplant surgeons, and mental health professionals to optimize outcomes in patients with YP poisoning.