Treatment of Hyperammonemia

Initial Management

The American College of Physicians recommends immediate stabilization of the patient's circulation, airway, and breathing, with intubation and ventilation if necessary, for patients with hyperammonemia 2, 3
Temporary protein restriction is recommended to reduce nitrogen load and prevent further ammonia production, according to the Praxis Medical Insights guidelines 1, 4
Intravenous glucose and lipid supplementation should be provided to prevent catabolism, with a caloric intake of ≥100 kcal/kg/day 1, 4
The European Society for Pediatric Gastroenterology, Hepatology and Nutrition recommends monitoring plasma ammonia levels every 3-4 hours until normalized 1, 4

Nitrogen scavengers such as sodium benzoate and sodium phenylacetate should be initiated if ammonia levels rise above 150 μmol/L, as recommended by the Praxis Medical Insights guidelines 1

The American Academy of Pediatrics recommends assessing neurological status regularly for signs of encephalopathy in patients with hyperammonemia 1, 3
Plasma ammonia levels should be checked every 3-4 hours until normalization, according to the Praxis Medical Insights guidelines 1, 4

Hemodialysis is recommended if ammonia levels rise above 300-400 μmol/L despite medical therapy, or if neurological status rapidly deteriorates, as suggested by the Nature Reviews Nephrology guidelines 1, 4
The International Society for Peritoneal Dialysis recommends considering hemodialysis for patients with hyperammonemia who do not respond to medical therapy 2

Protein should be reintroduced within 48 hours after ammonia levels decrease to 80-100 μmol/L to prevent catabolism, according to the Nature Reviews Nephrology guidelines 1, 2
The European Society for Clinical Nutrition and Metabolism recommends starting with 0.25 g/kg/day and gradually increasing up to 1.5 g/kg/day as tolerated 1, 4

Delayed recognition and treatment can lead to irreversible neurological damage, as warned by the Nature Reviews Nephrology guidelines 1, 2
The American Association for Clinical Chemistry recommends that ammonia samples be collected from free-flowing venous or arterial blood, transported on ice, and processed within 15 minutes to avoid false elevations 2, 3