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Coagulation factors influencing thrombosis of aorta-coronary bypass grafts
Insights
Patients with occluded aorta-coronary artery vein grafts showed hypercoagulable blood. This suggests a link between blood clotting factors and graft failure, impacting coronary artery bypass surgery outcomes.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Vascular Biology
Background:
- Aorta-coronary artery vein grafts are crucial for treating coronary artery disease.
- Graft occlusion within one year significantly impacts patient prognosis.
- Hypercoagulability, a state of increased clotting tendency, is a potential risk factor for graft failure.
Purpose of the Study:
- To investigate the association between hypercoagulable states and the occlusion of aorta-coronary artery vein grafts.
- To compare coagulation profiles in patients with occluded grafts versus those with patent grafts.
Main Methods:
- Evaluation of 30 patients with all occluded aorta-coronary artery vein grafts and 11 patients with patent grafts.
- Cardiac catheterization to assess graft patency and blood flow.
- Laboratory tests to assess hypercoagulability markers: antithrombin III activity, thrombin generation index, factor VII values, and platelet adhesivity.
Main Results:
- 23 out of 30 patients (77%) with occluded grafts exhibited hypercoagulable blood.
- Hypercoagulability was indicated by low antithrombin III, high thrombin generation index, high factor VII, or high platelet adhesivity.
- None of the 11 patients with patent grafts showed signs of hypercoagulability.
Conclusions:
- Hypercoagulable blood is strongly associated with early occlusion of aorta-coronary artery vein grafts.
- Identifying and managing hypercoagulability may improve graft patency rates after coronary artery bypass surgery.
- Further research into the specific mechanisms linking hypercoagulability and graft failure is warranted.
Abstract:
Thirty patients in whom all aorta-coronary artery vein grafts became occluded within one year of operation, as demonstrated by cardiac catheterization, were evaluated for hypercoagulability. A total of 59 grafts were constructed in these patients. At operation, blood flows of 35 to 90 c.c. per minute were measured through the grafts. In 23 of the 30 patients, the blood was to be hypercoagulable, as evidenced by a low level of antithrombin III activity, high thrombin generation index, high factor VII values, or high platelet adhesivity. Another group of 11 patients (total number of grafts, 23) had all grafts patent at cardiac catheterization. These patients had flows through the grafts ranging from 20 to 125 c.c. per minute. None of the patients with patent grafts had hypercoagulable blood. The status of runoff was comparable between the patients with open grafts and those with occluded grafts.