Does rotational thromboelastometry (ROTEM) improve prediction of bleeding after cardiac surgery?

Area of Science:

• Cardiovascular Surgery
• Anesthesiology
• Critical Care Medicine
• Hematology

Background:

• Massive bleeding and coagulopathy are significant risks in cardiac surgery, especially with prolonged cardiopulmonary bypass (CPB).
• Current transfusion practices show wide variability, suggesting a need for better predictive tools.
• Rotational thromboelastometry (ROTEM) offers rapid, comprehensive coagulation assessment but its predictive utility in this context is unclear.

Purpose of the Study:

• To evaluate the predictive value of ROTEM for chest tube drainage (CTO) after cardiac surgery.
• To determine if ROTEM data improves prediction models for postoperative bleeding compared to standard clinical and laboratory parameters.

Main Methods:

• A study of 321 patients undergoing cardiac surgery with CPB.
• Collected perioperative and postoperative blood samples for ROTEM analysis.
• Utilized continuous and dichotomized CTO (600 mL and 910 mL) as primary endpoints.
• Developed regression models with and without ROTEM variables to assess predictive improvement.

Main Results:

• ROTEM variables significantly improved prediction for continuous CTO (P < 0.0001).
• ROTEM did not significantly improve prediction for dichotomized CTO at 600 mL (AUC P = 0.03) or 910 mL (AUC P = 0.23).
• Net reclassification index indicated ROTEM did not substantially improve overall patient classification for bleeding risk.

Conclusions:

• ROTEM data did not substantially enhance the prediction of chest tube drainage beyond established clinical and laboratory parameters.
• Individual ROTEM parameters were associated with CTO but did not significantly improve model fit.
• The utility of ROTEM in guiding transfusions during cardiac surgery requires further investigation.