Fibrinolytic System Changes in Liver Surgery: A Pilot Observational Study

Area of Science:

• Hepatobiliary surgery
• Hemostasis and thrombosis
• Surgical bleeding management

Background:

• Bleeding is a common complication in liver surgery.
• Imbalances in fibrinolytic factors like tissue plasminogen activator (t-PA) and plasminogen activator inhibitor-1 (PAI-1) may contribute to increased bleeding.
• Understanding perioperative changes in fibrinolysis is crucial for managing surgical blood loss.

Purpose of the Study:

• To investigate perioperative changes in fibrinolytic activity during liver surgery.
• To analyze the correlation between fibrinolytic markers (PAI-1 and t-PA) and blood loss or transfusion requirements.

Main Methods:

• A prospective pilot study involving 15 patients undergoing liver surgery.
• Plasma levels of PAI-1 and t-PA were measured at four time points: pre-surgery, before Pringle maneuver (PM), end of surgery, and 24 hours post-surgery.
• Demographic data, surgical details, hemodynamic parameters, blood loss, and blood product transfusions were recorded.

Main Results:

• Nine patients were analyzed after exclusions. PAI-1 levels significantly increased from pre-surgery to post-surgery (T3 and T4).
• t-PA levels peaked before the Pringle maneuver (T2) and decreased thereafter. This pattern was more pronounced in patients who underwent PM.
• Higher PAI-1 concentrations at the end of surgery correlated significantly with increased transfusion of fresh frozen plasma and red blood cells.

Conclusions:

• Liver surgery is associated with increased fibrinolysis, characterized by elevated PAI-1 and t-PA levels, particularly after surgery initiation and PM.
• Elevated PAI-1 levels post-surgery are linked to greater transfusion needs, highlighting its potential role in surgical bleeding.
• Larger studies are needed to confirm these findings and their clinical implications.