Fatal self-poisoning with lithium carbonate

Area of Science:

• Toxicology
• Pharmacokinetics
• Nephrology

Background:

• Lithium carbonate is a mood stabilizer with a narrow therapeutic index.
• Overdosing on lithium carbonate can lead to severe toxicity and fatalities.
• Understanding lithium absorption and elimination is crucial for managing overdose cases.

Purpose of the Study:

• To investigate the pharmacokinetic profile of lithium in a fatal self-poisoning case.
• To evaluate the effectiveness of dialysis in managing severe lithium toxicity.
• To identify factors contributing to delayed toxicity and poor outcomes in lithium overdose.

Main Methods:

• Case report of a fatal lithium carbonate self-poisoning.
• Monitoring of serum lithium concentrations over 48 hours post-ingestion.
• Simultaneous peritoneal dialysis and hemodialysis were initiated.
• Clinical assessment of neurological status and respiratory function.

Main Results:

• Serum lithium concentration progressively increased for 48 hours, suggesting prolonged gastrointestinal absorption.
• A 45-hour interval was observed between overdose ingestion and central nervous system depression onset.
• Dialysis effectively reduced serum lithium levels but showed minimal impact on the patient's level of consciousness.
• The patient ultimately succumbed to a respiratory complication secondary to the comatose state.

Conclusions:

• Prolonged absorption of lithium from insoluble aggregates can lead to sustained high serum levels.
• Standard dialysis may not rapidly reverse severe neurological impairment in lithium overdose.
• Respiratory complications are a significant risk in lithium-induced coma.
• Aggressive and potentially prolonged supportive care is necessary in severe lithium poisoning cases.