Colloid-induced changes in bleeding following liver resection in the rat

Area of Science:

• Surgical Research
• Haemostasis and Thrombosis
• Pharmacology

Background:

• Liver resection can lead to significant blood loss.
• Fluid management strategies are crucial for optimizing haemostasis during surgery.
• Different intravenous fluids may differentially affect blood clotting and bleeding risk.

Purpose of the Study:

• To investigate the impact of various preoperative fluid infusions on haemostasis following liver resection.
• To compare the effects of crystalloids, dextrans, degraded gelatin, and hydroxyethyl starch on bleeding.
• To assess the influence of these fluids on bleeding time, blood loss, and platelet aggregation.

Main Methods:

• Standardized liver resection was performed on rats.
• Rats received preoperative infusions of Ringer's solution, Ringer's acetate, dextran 70, dextran 40, degraded gelatin, or hydroxyethyl starch.
• Bleeding time, blood loss, activated partial thromboplastin time (APTT), and platelet aggregation were measured.

Main Results:

• Ringer's and Ringer's acetate solutions showed no significant adverse effects on haemostasis beyond expected haemodilution.
• Dextrans, degraded gelatin, and hydroxyethyl starch significantly increased bleeding time and blood loss.
• Hydroxyethyl starch administration prolonged APTT, while dextrans and hydroxyethyl starch impaired platelet aggregation.

Conclusions:

• Colloidal solutions, including dextrans, degraded gelatin, and hydroxyethyl starch, impair haemostasis and increase bleeding risk after liver resection.
• Isotonic crystalloid solutions like Ringer's and Ringer's acetate do not adversely affect haemostasis in this model.
• Careful selection of perioperative fluids is essential to minimize bleeding complications in liver surgery.