A child with chicken pox develops vomiting, confusion, seizures, and coma. Ammonia is elevated. What is suspected?

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Multiple Choice

A child with chicken pox develops vomiting, confusion, seizures, and coma. Ammonia is elevated. What is suspected?

This scenario is classic for Reye's syndrome. It’s a dangerous pediatric condition that can follow a viral illness like chicken pox, especially if aspirin has been used. The hallmark is acute liver dysfunction with resultant hyperammonemia, which drives the brain toward encephalopathy. That explains why the child is vomiting, becoming confused, having seizures, and progressing to coma—the rising ammonia levels reflect the liver’s failure to detoxify ammonia and the brain’s consequent edema and dysfunction. The underlying issue is mitochondrial failure in liver cells leading to microvesicular fatty change and a compromised urea cycle, so brain function deteriorates rapidly. While hepatic failure also involves elevated ammonia, the combination of a recent viral illness and the clinical sequence here makes Reye’s syndrome the best explanation. Guillain-Barré syndrome would present with peripheral weakness and reflex changes rather than encephalopathy from liver failure. Meningitis would more likely show fever and signs of meningeal irritation with CSF abnormalities rather than a primary hepatic-to-brain toxic process.

This scenario is classic for Reye's syndrome. It’s a dangerous pediatric condition that can follow a viral illness like chicken pox, especially if aspirin has been used. The hallmark is acute liver dysfunction with resultant hyperammonemia, which drives the brain toward encephalopathy. That explains why the child is vomiting, becoming confused, having seizures, and progressing to coma—the rising ammonia levels reflect the liver’s failure to detoxify ammonia and the brain’s consequent edema and dysfunction. The underlying issue is mitochondrial failure in liver cells leading to microvesicular fatty change and a compromised urea cycle, so brain function deteriorates rapidly.

While hepatic failure also involves elevated ammonia, the combination of a recent viral illness and the clinical sequence here makes Reye’s syndrome the best explanation. Guillain-Barré syndrome would present with peripheral weakness and reflex changes rather than encephalopathy from liver failure. Meningitis would more likely show fever and signs of meningeal irritation with CSF abnormalities rather than a primary hepatic-to-brain toxic process.

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