Modeling splanchnic hemodynamics after distal splenorenal shunt: a computer simulation and sensitivity analysis

Area of Science:

• Vascular Surgery
• Medical Engineering
• Hepatology

Background:

• The distal splenorenal shunt (DSS) operation was designed to preserve portal vein flow and pressure.
• However, portal flow often decreases significantly within the first year, particularly in alcoholic patients.
• Existing explanations for flow loss are varied, and modifications like splenopancreatic disconnection have been proposed.

Purpose of the Study:

• To model the distal splenorenal shunt (DSS) using an electrical circuit analogy.
• To analyze the sensitivity of portal flow to different resistance elements within the shunt.
• To investigate explanations for the gradual decline in hepatic hemodynamics after DSS.

Main Methods:

• Development of a computer program to model the DSS as an electrical circuit.
• Sensitivity analysis of portal flow to individual resistance components.
• Simulation experiments to evaluate proposed explanations for hemodynamic changes.

Main Results:

• Portal flow was found to be most sensitive to resistance in the renal vein, followed by the anastomosis.
• Simulation experiments provided insights into the mechanisms of gradual hepatic hemodynamic changes.
• The study identified potential new strategies to prevent portal flow loss post-DSS.

Conclusions:

• The electrical circuit model effectively simulates DSS hemodynamics.
• Restricting dilation in the splenic vein, anastomosis, or renal vein is a potential novel approach to maintain portal flow.
• Further clinical studies are necessary to validate these simulation-based predictions.