Overview
Ammonia encephalopathy is a neurological condition characterized by elevated blood ammonia levels leading to altered mental status, often precipitated by metabolic disturbances or certain medications, particularly valproic acid 1.Diagnosis
Elevated serum ammonia levels 1
Presence of altered mental status (e.g., drowsiness, bradypsychia) 1
Consider patient history of valproic acid use 1
Neurological examination may reveal tremors or other motor deficits 1Management
Discontinue valproic acid if contributing to hyperammonemia 1
Initiate l-carnitine infusion for treatment 1
Supportive care including airway management if necessary 1
Monitor and manage sedation levels carefully during procedures 1Special Populations
No specific details provided for pregnancy, pediatrics, elderly, or comorbidities in the given abstracts 1Key Recommendations
Consider ammonia encephalopathy in patients on valproic acid presenting with mental status changes prior to awake craniotomy procedures (Evidence: Expert opinion) 1
Discontinue valproic acid and initiate l-carnitine infusion for treatment of elevated ammonia levels (Evidence: Weak) 1
Vigilantly monitor sedation and mental status during awake neurosurgical procedures to promptly address any signs of encephalopathy (Evidence: Expert opinion) 1References
1 Villalba Martínez G, Fernández-Candil JL, Vivanco-Hidalgo RM, Pacreu Terradas S, León Jorba A, Arroyo Pérez R. Ammonia encephalopathy and awake craniotomy for brain language mapping: cause of failed awake craniotomy. Revista espanola de anestesiologia y reanimacion 2015. link