Which neurological sign is most commonly associated with hepatic encephalopathy?

• A. Nystagmus
• B. Seizure
• C. Tremor
• D. Asterixis

Answer: (D)

The main idea being tested is recognizing the hallmark neurological sign of hepatic encephalopathy. In liver failure with metabolic brain dysfunction, the most characteristic finding is asterixis, known as the liver flap. It appears as a sudden, brief lapse in the ability to maintain a sustained posture when the patient holds the arms out with the wrists dorsiflexed, giving a flapping tremor of the hands.

This sign reflects the way toxic metabolites, especially ammonia, disrupt cerebral function and motor control. It’s more specific to hepatic encephalopathy than other listed signs because it directly demonstrates a transient impairment in motor maintenance due to metabolic encephalopathy, rather than a more general or less specific movement abnormality.

Nystagmus can occur in some neurologic conditions, including advanced hepatic encephalopathy, but it is not the most common or characteristic sign. Tremor in general can be present, but it is less distinctive and can occur in many situations. Seizures are possible in hepatic encephalopathy but are not the typical presenting sign. So the distinctive, most frequently observed neurologic manifestation in this context is the asterixis.