Heparin-protamine mismatch. A controllable factor in bleeding after open heart surgery

Area of Science:

• Cardiovascular Surgery
• Anesthesiology
• Hematology

Background:

• Heparin and protamine sulfate are critical for managing anticoagulation and its reversal during open heart surgery.
• Heparin-protamine mismatch can lead to increased blood product transfusion and postoperative bleeding.
• Optimizing protamine dosing is essential to minimize complications and improve patient outcomes.

Purpose of the Study:

• To evaluate a novel system designed to minimize heparin-protamine mismatch.
• To assess the impact of this system on postoperative bleeding and blood product requirements.
• To determine if a reduced protamine dose is associated with improved surgical outcomes.

Main Methods:

• A retrospective review of 150 patients undergoing open heart surgery.
• Group 1 (n=75) received a fixed heparin-protamine ratio.
• Group 2 (n=75) received titrated heparin and protamine based on activated clotting times and drug lot matching.

Main Results:

• Patients receiving titrated protamine (Group 2) required significantly lower doses (287.56 mg vs 346.01 mg).
• Group 2 showed reduced transfusion of red blood cells, platelets, and fresh-frozen plasma.
• No patients in Group 2 needed reoperation for bleeding, compared to eight in Group 1.

Conclusions:

• Reducing protamine sulfate dose through optimized titration significantly decreases blood product use.
• Minimized heparin-protamine mismatch is linked to reduced postoperative bleeding after open heart surgery.
• Excess protamine is a controllable factor contributing to coagulopathy, warranting careful management.