Related Experiment Videos
Evidence against hypercoagulability in coronary artery disease
P Görög1, C D Ridler, G M Rees
1Thrombosis Unit, St. Bartholomew's Hospital Medical School, London, England.
Insights
Coronary artery disease patients are not hypercoagulable, despite elevated clotting factors. Enhanced platelet reactivity, not coagulation imbalance, drives their prothrombotic state, impacting coronary atherosclerosis.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Thrombosis Research
Background:
- Elevated plasma clotting factors in coronary artery disease (CAD) suggest a hypercoagulable state.
- This interpretation is challenged by the lack of direct evidence for altered coagulation mechanisms.
- Understanding the prothrombotic state in CAD is crucial for effective treatment strategies.
Purpose of the Study:
- To investigate the overall coagulation status in patients with CAD.
- To compare coagulation and platelet reactivity between CAD patients and healthy controls.
- To determine the relationship between coagulation status, platelet reactivity, and CAD severity.
Main Methods:
- Utilized a dynamic global test to assess coagulation status in 761 CAD patients undergoing coronary artery bypass grafting.
- Compared coagulation status with 100 healthy matched controls.
- Measured platelet reactivity to shear-stress using identical, non-anticoagulated blood samples.
Main Results:
- Overall coagulation status did not significantly differ between CAD patients and controls.
- Coagulation status showed no correlation with the severity of coronary atherosclerosis.
- Platelet reactivities were significantly increased in patients with multi-vessel disease compared to single-vessel disease.
Conclusions:
- The procoagulant state in CAD is not due to a hypercoagulable mechanism.
- Enhanced platelet reactivity, rather than coagulation imbalance, underlies the prothrombotic state in CAD.
- Findings suggest a shift in focus from coagulation factors to platelet function in understanding CAD pathophysiology.
Abstract:
The strong epidemiological association between elevated plasma clotting factors and coronary artery disease is generally interpreted as evidence that patients with coronary atherosclerosis are in a procoagulant (hypercoagulable) state. A dynamic global test was used to assess the overall coagulation status of 761 patients with coronary artery disease scheduled for coronary artery bypass grafting and compared to healthy matched controls (n = 100). Platelet reactivity to shear-stress was simultaneously measured from identical, non-anticoagulated blood samples. Contrary to expectation, the overall coagulation in cardiac patients did not differ significantly from that of controls. Furthermore, the coagulation status of patients bore no relationship to the severity of coronary atherosclerosis. The latter is in contrast with platelet reactivities, which were significantly increased in patients with > or = 2 vessel disease as compared with single vessel disease. The present results do not necessarily conflict with the finding of elevated plasma clotting factors in cardiac patients. However, they do not support the claim that these markers are a reflection of a hypercoagulable state. Indeed, this study confirms that such patients are in a prothrombotic state, which is related to enhanced platelet reactivities, and not to a prothrombotic imbalance of the coagulation mechanism.