Residual Heparinization After Cardiac Surgery:A Prospective Observational Study.

Area of Science:

• Cardiovascular Surgery
• Anesthesiology
• Hematology

Background:

• Residual heparinization is a common, preventable cause of coagulopathy after cardiac surgery.
• Effective monitoring of heparin activity is crucial for patient outcomes.

Purpose of the Study:

• To determine the incidence of residual heparinization post-cardiac surgery.
• To investigate the association between residual heparinization and postoperative bleeding.
• To identify factors contributing to residual heparinization.

Main Methods:

• Prospective observational study involving adult patients undergoing cardiac surgery with cardiopulmonary bypass.
• Thromboelastography (TEG) used to measure heparin activity (delta-R ≥4 minutes) 2 hours post-ICU admission.
• Analysis of chest-drain outputs at 24 hours and correlation with heparin doses and activity.

Main Results:

• Residual heparinization was detected in 27.3% of 99 patients.
• No significant difference in overall postoperative bleeding between patients with and without residual heparinization.
• Higher intraoperative heparin doses were associated with increased postoperative heparin activity.
• A subgroup analysis indicated that higher delta-R values (≥4 minutes) correlated with increased 24-hour chest drain output.

Conclusions:

• Residual heparinization is frequent after cardiac surgery but did not show a direct link to increased bleeding in this cohort.
• Higher levels of residual heparin activity, indicated by delta-R values, correlated with greater postoperative blood loss.
• Thromboelastography is effective in detecting heparin activity, but the threshold for increased bleeding risk requires further definition.