Advanced thallium toxicity

Area of Science:

• Toxicology
• Neurology
• Environmental Health

Background:

• Thallium is a highly toxic, odorless, and tasteless metal.
• Exposure can occur through skin absorption, inhalation, or ingestion.
• Thallium toxicity is rare and often misdiagnosed or delayed.

Observation:

• A 41-year-old landscaper presented with acute polyneuropathy and abdominal pain.
• Initial diagnoses included Guillain-Barré syndrome and autoimmune encephalopathy.
• Progressive symptoms over 42 days included muscle weakness, delirium, and alopecia.

Findings:

• The patient was diagnosed with thallium toxicity.
• Treatment involved Prussian blue, activated charcoal, and continuous venovenous haemofiltration.
• The patient showed improvement but experienced residual neuropsychiatric and neuromuscular deficits.

Implications:

• Highlights the importance of considering thallium toxicity in unexplained polyneuropathy and neurological symptoms.
• Emphasizes the need for proper evidence preservation and information disclosure when the toxin source is uncertain.
• Underscores the potential for long-term sequelae despite aggressive treatment for heavy metal poisoning.