How much ischemia can the liver tolerate during resection?

Area of Science:

• Hepatobiliary Surgery
• Surgical Oncology
• Transplantation

Background:

• Vascular inflow occlusion (VIO), or Pringle maneuver, is crucial for minimizing blood loss in liver surgery.
• VIO involves clamping the portal triad, occluding hepatic artery and portal vein.
• A significant side effect of VIO is hepatic ischemia/reperfusion (I/R) injury, leading to oxidative stress and potential liver dysfunction.

Purpose of the Study:

• To determine the safe duration limits for VIO in liver surgery.
• To compare the safety and efficacy of continuous versus intermittent VIO techniques.
• To establish guidelines for balancing blood loss prevention with minimizing hepatic I/R injury.

Main Methods:

• Literature review on hepatic ischemia duration and outcomes.
• Analysis of studies investigating VIO techniques (continuous vs. intermittent).
• Evaluation of the correlation between ischemia time and severity of liver injury.

Main Results:

• Both continuous and intermittent VIO are safe when ischemia duration is limited to 120 minutes.
• For ischemia times exceeding 120 minutes, intermittent VIO is the recommended technique.
• No definitive consensus exists on the absolute maximum tolerable ischemia time, but 120 minutes is a key threshold.

Conclusions:

• VIO is effective in reducing intraoperative bleeding during liver surgery.
• Careful management of VIO duration is essential to mitigate I/R injury.
• Intermittent VIO offers a safer approach for prolonged liver ischemia, exceeding 120 minutes.