Hypokalemia-Induced Hyperammonemia in Hepatic Failure

Pathophysiological Mechanism

• The liver's capacity for ammonia detoxification is compromised in hepatic failure, with reduced functioning hepatocyte mass limiting urea cycle capacity, and hypokalemia further impairing the remaining functional urea cycle capacity, according to the European Association for the Study of the Liver 1, 2

Clinical Implications in Hepatic Failure

• Ammonia plays a central role in hepatic encephalopathy pathophysiology, with levels correlating with severity of encephalopathy, as stated by the European Association for the Study of the Liver 1, 2
• Blood ammonia levels >200 μmol/L are associated with poor neurological outcomes, as reported by a medical guideline society 3

Diagnostic Considerations

• Plasma ammonia measurement should be performed in patients with acute encephalopathy and liver disease, as a normal value brings the diagnosis of hepatic encephalopathy into question, according to the European Association for the Study of the Liver 1, 2