Cerebral Hemodynamics and Cognitive Function in Cirrhotic Patients with Hepatic Encephalopathy

Area of Science:

• Neurology
• Hepatology
• Medical Imaging

Background:

• Hepatic encephalopathy (HE) is a neurological complication of liver cirrhosis.
• Cerebral hemodynamics and cognitive function are often impaired in patients with HE.
• The relationship between ammonia levels, cerebral hemodynamics, and cognitive function in HE requires further investigation.

Purpose of the Study:

• To investigate cerebral hemodynamics in cirrhotic patients with varying degrees of hepatic encephalopathy (HE).
• To assess the impact of lactulose treatment on cerebral hemodynamics and ammonia levels in patients with minimal hepatic encephalopathy (MHE).
• To explore correlations among ammonia, cerebral hemodynamics, and cognitive function in cirrhosis.

Main Methods:

• Four groups were studied: healthy controls, cirrhosis without HE, cirrhosis with MHE, and cirrhosis with overt HE (OHE).
• Cerebral hemodynamics were assessed using transcranial Doppler (TCD).
• Patients with MHE were randomized to receive lactulose treatment or placebo, with re-evaluation of ammonia and TCD parameters post-treatment.

Main Results:

• Pre-treatment, ammonia levels and cerebral hemodynamic parameters (Vmean, PI, RI) differed significantly across groups and correlated with HE severity.
• Lactulose treatment in MHE patients led to improved Vmean and reduced ammonia, PI, and RI levels.
• No significant changes were observed in the control group, and correlations were found between ammonia, cerebral hemodynamics, and cognitive tests (NCT-A, DST).

Conclusions:

• Cerebral hemodynamics are significantly related to the severity of hepatic encephalopathy.
• Cerebral autoregulation is impaired in cirrhotic patients with HE.
• Ammonia levels, cerebral hemodynamics, and cognitive function are closely interconnected, with treatment improving cerebral hemodynamics.