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The platelet thrombin receptor and postoperative bleeding
V A Ferraris1, S P Ferraris, A Singh
1Division of Cardiothoracic Surgery, Albany Medical College, New York, USA.
The Annals of Thoracic Surgery
|March 4, 1998
Summary
Cardiopulmonary bypass (CPB) reduces platelet thrombin receptor function, leading to postoperative bleeding. Targeting this receptor dysfunction may reduce transfusion needs and improve patient outcomes.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Platelet Physiology
Background:
- Cardiopulmonary bypass (CPB) may desensitize platelet thrombin receptors.
- This desensitization could cause postoperative platelet dysfunction and bleeding.
Purpose of the Study:
- To investigate changes in platelet thrombin receptor function during CPB.
- To correlate these changes with postoperative bleeding.
Main Methods:
- Studied 79 patients undergoing CPB.
- Measured platelet function (aggregation, activation, adhesion) using aggregometry and flow cytometry.
- Assessed platelet-white cell interactions and surface markers.
Main Results:
- TRAP-induced platelet activation significantly reduced post-CPB.
- Reduced TRAP response correlated with increased need for blood transfusion.
- Other activating agents showed normal responses by 24 hours post-CPB.
Conclusions:
- CPB impairs platelet activation, aggregation, and leukocyte adhesion via TRAP.
- Diminished thrombin receptor responsiveness is linked to excessive bleeding.
- A potential second thrombin receptor may be protected during CPB, suggesting a therapeutic target.