Factors Affecting Bleeding During Hepatectomy

Patient-Related Factors

• The presence of cirrhosis, especially Child-Turcotte-Pugh class C, significantly increases bleeding risk during hepatectomy, as stated by the American Association for the Study of Liver Diseases 1, 2
• Acute kidney injury increases bleeding risk, particularly in patients with acute-on-chronic liver failure undergoing procedures, according to the European Association for the Study of the Liver 3, 4
• Hypofibrinogenemia has been identified as an independent predictor of bleeding in patients with acute-on-chronic liver failure, as reported by the American College of Gastroenterology 3
• Bacterial infections can significantly worsen bleeding risk during hepatectomy, as noted by the Infectious Diseases Society of America 4

Surgical and Technical Factors

• Lower central venous pressure (CVP) is associated with decreased blood loss during liver resection, as recommended by the Society of Critical Care Medicine 5
• Stroke volume variation (SVV) monitoring has shown better results than central venous pressure (CVP) monitoring in reducing blood loss during laparoscopic liver surgery, according to the Society of American Gastrointestinal and Endoscopic Surgeons 5

Hemostatic Management Considerations

• Traditional coagulation tests (INR, PT) often overestimate bleeding risk in hepatectomy patients and do not reliably predict procedural bleeding, as stated by the American Association for the Study of Liver Diseases 2
• Platelet count below 50,000/μL may increase bleeding risk, though this threshold has not been well validated clinically, as noted by the American Society of Hematology 2
• Prophylactic blood product transfusion before procedures has not been shown to reduce bleeding risk and may paradoxically increase complications, as reported by the American College of Surgeons 2

Perioperative Management Strategies

• Anti-thrombotic prophylaxis with LMWH or unfragmented heparin should be started 2-12 hours before surgery to reduce thromboembolic complications, as recommended by the American College of Chest Physicians 6
• Restrictive transfusion strategy (transfusion with hemoglobin <7 g/dl with a target of 7-9 g/dl) is recommended to avoid increasing portal pressure, according to the European Association for the Study of the Liver 7
• Routine use of tranexamic acid to decrease procedure-related bleeding is discouraged in patients with cirrhosis, as stated by the American Association for the Study of Liver Diseases 7

Common Pitfalls to Avoid

• Overreliance on INR/PT values to predict bleeding risk, as these parameters often overestimate coagulopathy after hepatectomy, as noted by the American College of Gastroenterology 2
• Unnecessary prophylactic blood product transfusions based solely on laboratory values, which may increase complications without reducing bleeding, as reported by the American College of Surgeons 2, 7
• Excessive fluid administration can be as harmful as blood loss during liver surgery, as stated by the Society of Critical Care Medicine 5
• Neglecting to treat underlying conditions like infections or acute kidney injury that may contribute more to bleeding risk than coagulation abnormalities, as noted by the Infectious Diseases Society of America and the European Association for the Study of the Liver 3, 4

Preoperative Factors Affecting Bleeding During Hepatectomy

Patient-Related Factors

• The American Association for the Study of Liver Diseases recommends addressing acute and/or chronic kidney dysfunction before elective procedures to reduce bleeding risk, and notes that there is no specific INR or platelet cutoff that reliably predicts increased bleeding risk 8

Medication-Related Factors

• The American Association for the Study of Liver Diseases suggests that medications, particularly antiplatelet therapy and anticoagulation, alter bleeding risk and should be carefully managed in the preoperative period 8

Surgical Approach Considerations

• Chemical thromboprophylaxis with low molecular weight heparin or unfragmented heparin should be started postoperatively rather than preoperatively to balance bleeding and thrombotic risks, according to guidelines from the World Journal of Emergency Surgery 9, 10
• Intermittent pneumatic compression devices should be applied prior to anesthesia induction to reduce thrombotic risk without increasing bleeding, as recommended by the World Journal of Emergency Surgery 9, 10

Fluid and Hemoderivative Management in Hepatectomy

Intraoperative Fluid Management

• Maintaining a low central venous pressure (CVP) (<5 cm H₂O) during hepatic transection, using balanced crystalloids as maintenance fluid and avoiding excessive crystalloid administration and blood loss, is recommended by the World Journal of Emergency Surgery 11, 12
• A low CVP (<5 cm H₂O) during hepatic transection significantly reduces blood loss, although without significant differences in red blood cell transfusion requirements, intraoperative morbidity, or long-term survival benefits 13, 12
• The American College of Surgeons recommends that a combination of CVP monitoring and stroke volume variation (SVV) methods may become the standard for hemodynamic monitoring in hepatic surgery 13
• Balanced crystalloids (e.g., lactated Ringer's) should be preferred over 0.9% saline or colloids as maintenance fluid to avoid hyperchloremic acidosis and other causes of postoperative morbidity, as suggested by the World Journal of Emergency Surgery 13, 12, 14
• Excessive crystalloid administration should be avoided, as it can be as harmful as blood loss during hepatic surgery, according to the World Journal of Emergency Surgery 12

Goal-Directed Fluid Therapy (GDFT)

• GDFT optimizes cardiac output and end-organ perfusion, being particularly beneficial after intraoperative hepatic resection during a state of low CVP to restore tissue perfusion, as recommended by the World Journal of Emergency Surgery 11, 12, 15
• Patients with comorbidities and reduced cardiac function are the most likely to benefit from GDFT, according to the World Journal of Emergency Surgery 11, 12, 16
• A meta-analysis of 32 randomized controlled trials including approximately 3000 patients demonstrated significant benefits of GDFT in reducing morbidity and mortality during major surgery, as reported by the World Journal of Emergency Surgery 12

Postoperative Monitoring

• An increase in weight >3.5 kg on postoperative day 2 is an independent risk factor for major complications after hepatic surgery, suggesting that postoperative weight fluctuation should be carefully monitored and potentially minimized, as recommended by the World Journal of Emergency Surgery 12
• Early mobilization (out of bed) after hepatic surgery should be established from the operative day to hospital discharge, according to the World Journal of Emergency Surgery 11, 15, 16