Ischemic preconditioning-induced hyperperfusion correlates with hepatoprotection after liver resection.

Area of Science:

• Hepatobiliary surgery
• Surgical oncology
• Transplantation immunology

Background:

• Hepatic resection requires temporary interruption of liver blood supply.
• The Pringle maneuver (PM) is commonly used to reduce bleeding during hepatectomy.
• Ischemic preconditioning (IP) may offer protective benefits against ischemia-reperfusion injury.

Purpose of the Study:

• To evaluate the impact of ischemic preconditioning (IP) followed by the Pringle maneuver (PM) on liver blood supply after hepatectomy.
• To compare liver perfusion and hepatocellular injury between PM alone and IP + PM groups.

Main Methods:

• Sixty-one patients undergoing hepatic resection were randomized to PM alone or IP + PM.
• Liver perfusion was quantified using Doppler probes at the hepatic artery and portal vein.
• Hepatocellular injury was assessed by alanine aminotransferase (ALT) levels.

Main Results:

• IP + PM maintained portal vein flow and significantly increased hepatic artery flow (+56%) post-reperfusion.
• PM alone resulted in a 29% decrease in portal vein flow and an 8% increase in arterial flow.
• Hepatocellular injury (ALT levels) was significantly lower in the IP + PM group.

Conclusions:

• IP effectively prevents postischemic reduction in portal vein flow after hepatectomy.
• IP enhances hepatic artery perfusion, indicating improved macrocirculation.
• Improved hepatic macrocirculation following IP + PM acts as a protective mechanism against liver injury.