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Platelet activation and aggregation during cardiopulmonary bypass.
C S Rinder1, J Bohnert, H M Rinder
1Department of Anesthesiology, Yale University School of Medicine, New Haven, Connecticut 06510.
Anesthesiology
|September 1, 1991
Summary
Cardiopulmonary bypass activates platelets, leading to their prolonged circulation and impaired aggregation. This study quantifies activated platelets and reveals distinct defects following extracorporeal circulation.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Biomedical Engineering
Background:
- Platelet activation during cardiopulmonary bypass (CPB) is indicated by increased plasma levels of granule products.
- Circulating activated platelets may cause the common platelet dysfunction observed after CPB.
- Understanding platelet behavior during CPB is crucial for managing complications.
Purpose of the Study:
- To directly measure the percentage of circulating activated platelets during CPB using GMP-140 expression.
- To compare platelet activation with adenosine diphosphate (ADP)-induced aggregation response.
- To elucidate the complex platelet defects associated with CPB.
Main Methods:
- Flow cytometry utilized a monoclonal antibody against GMP-140 to detect activated platelets.
- Measurements taken from 41 patients before, during, and after CPB.
- Platelet aggregation assessed using ADP stimulation, compared with GMP-140 expression.
Main Results:
- CPB significantly increased GMP-140-positive platelets, peaking at 29% before CPB separation.
- Activated platelets persisted in circulation postoperatively.
- ADP-induced platelet aggregation showed a distinct defect, not correlating with activation levels.
Conclusions:
- CPB induces alpha-granule release and prolonged circulation of activated platelets.
- A distinct platelet aggregation defect occurs, separate from activation.
- CPB results in a complex set of platelet dysfunctions, including activation and impaired aggregation.