Hyperbilirubinemia after extracorporeal circulation surgery: a recent and prospective study

Area of Science:

• Cardiology
• Hepatology
• Critical Care Medicine

Background:

• Postoperative hyperbilirubinemia is a potential complication following cardiac surgery involving extracorporeal circulation.
• Understanding its incidence, risk factors, and clinical significance is crucial for patient management.

Purpose of the Study:

• To determine the incidence and characteristics of postoperative hyperbilirubinemia after modern extracorporeal circulation.
• To identify perioperative risk factors associated with its development.
• To evaluate the clinical impact of postoperative hyperbilirubinemia on mortality and morbidity.

Main Methods:

• Prospective investigation of 386 patients undergoing extracorporeal circulation for cardiac lesions.
• Definition of postoperative hyperbilirubinemia as serum total bilirubin > 51 micromol/L.
• Logistic regression analysis to compare perioperative parameters and identify risk factors for hyperbilirubinemia and mortality.

Main Results:

• The incidence of postoperative hyperbilirubinemia was 25.3%.
• Peak bilirubin levels typically occurred on postoperative days 1 or 2, with increases in both conjugated and unconjugated bilirubin.
• Hyperbilirubinemia was associated with higher mortality, prolonged mechanical ventilation, and longer ICU stays.
• Predictors included preoperative bilirubin, right atrium pressure, number of valves replaced, and blood transfusion requirement.

Conclusions:

• Early postoperative hyperbilirubinemia after extracorporeal circulation is multifactorial, involving impaired liver function and increased bilirubin production.
• It is significantly associated with increased mortality.
• Preoperative bilirubin concentration, right atrial pressure, valve replacement procedures, and blood transfusion are key contributing factors.