Valproic acid intoxication imitating brain death.

Area of Science:

• Neurology
• Toxicology
• Critical Care Medicine

Background:

• Brain death diagnosis requires ruling out confounding factors like intoxication.
• Sedatives and anesthetics can mimic brain death, necessitating careful clinical evaluation.
• Tricyclic antidepressants and barbiturates are known to cause profound neurological depression mimicking brain death.

Observation:

• A 19-year-old male presented with confusion, progressing to deep coma with absent brain stem reflexes, including pupillary light response.
• Computed tomography ruled out brain edema as the cause of neurological deficits.
• Blood analysis revealed extreme valproic acid levels (12,430 micromol/L) and severe hyperammonemia (500 micromol/L).

Findings:

• Valproic acid intoxication, previously undocumented to mimic brain death, presented with a clinical picture indistinguishable from brain death.
• Treatment involved L-carnitine and continuous venovenous hemodiafiltration to manage valproic acid and ammonia toxicity.
• Neurological status dramatically improved following normalization of serum valproic acid and ammonia levels.

Implications:

• This case expands the spectrum of drug intoxications that can mimic brain death.
• Highlights the critical importance of toxicological screening in patients with unexplained coma and absent brain stem reflexes.
• Suggests that aggressive supportive care, including extracorporeal methods, can reverse profound toxic encephalopathy mimicking brain death.