Letter to the Editor: Hemodynamic role in hepatic encephalopathy pathogenesis following transjugular intrahepatic portosystemic shunt placement

Hepatic encephalopathy (HE) is a common complication following transjugular intrahepatic portosystemic shunt (TIPS) placement and is thought to result from reduced hepatic detoxification of neurotoxins. However, Zhuang et al in the World Journal of Radiology demonstrate that this understanding may be incomplete through exploration of the pathophysiology from a hemodynamic perspective. They found significant changes in cerebral blood flow (CBF) and spontaneous brain activity following TIPS. Initially, CBF increased in specific areas within the first month, followed by a return to baseline at three months. These CBF changes coincided with increased spontaneous brain activity that persisted in some areas, suggesting compensation for functional loss in other regions. Together with the fact that serum ammonia remained unchanged in this cohort and prior work showing that, after three months, HE risk returns to pre-TIPS levels, these results suggest that HE may develop in individuals susceptible to these hemodynamic and adaptive changes, warranting further research.