Determinants of antithrombin consumption in cardiac operations requiring cardiopulmonary bypass

Area of Science:

• Cardiology
• Hematology
• Anesthesiology

Background:

• Antithrombin (AT) is a crucial natural anticoagulant.
• AT is significantly consumed during cardiac operations involving cardiopulmonary bypass (CPB).
• Understanding factors influencing AT consumption is vital for managing anticoagulation during CPB.

Purpose of the Study:

• To identify predictors of Antithrombin (AT) consumption during cardiac surgery with CPB.
• To develop a predictive model for AT activity post-cardiac operations.
• To establish predictive tables for AT consumption based on patient and procedural variables.

Main Methods:

• Observational trial involving 250 adult patients undergoing cardiac operations with CPB.
• Univariate and multivariate analyses were performed on preoperative and intraoperative variables.
• Key variables assessed included preoperative AT activity, age, diabetes, hematocrit, dialysis, operation type, CPB duration, and lowest CPB temperature.

Main Results:

• Eight predictors of postoperative AT activity were identified in univariate analysis.
• Five independent predictors of AT activity were determined by multivariate analysis: preoperative AT activity, age, combined operation, diabetes, and CPB duration.
• Statistical significance (p-values) was established for each independent predictor.

Conclusions:

• Preoperative AT activity, patient age, diabetes status, type of cardiac operation (combined vs. isolated), and CPB duration are significant independent predictors of AT consumption.
• Predictive tables for AT consumption can be established based on these identified risk factors.
• These findings can aid in optimizing anticoagulation management during CPB in cardiac surgery.