Transient idiopathic hyperammonaemia in adults.

Area of Science:

• Biochemistry
• Oncology
• Nephrology

Background:

• Acute leukemia treatment can lead to unexpected metabolic complications.
• Hyperammonaemia is typically associated with liver dysfunction, but this study explores other causes.

Observation:

• Three patients undergoing acute leukemia treatment developed sudden, severe hyperammonaemia.
• Two patients experienced fatal acute encephalopathy, while one survived with aggressive intervention.

Findings:

• The condition occurred without significant liver dysfunction, distinguishing it from other hyperammonaemic disorders.
• Urinary nitrogen studies suggest impaired ureagenesis in a catabolic state as a key factor.
• Normal mitochondrial ultrastructure and plasma amino acid profiles further differentiate this disorder.

Implications:

• This suggests a novel mechanism for hyperammonaemia in catabolic states, particularly during cancer therapy.
• Highlights the importance of monitoring ammonia levels in leukemia patients, even without apparent liver disease.
• Effective management strategies include hemodialysis and specific intravenous infusions like sodium benzoate and phenylacetate.