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Published on: November 24, 2014
Risk factors for myocardial infarction during coronary artery bypass graft surgery
Insights
Patients undergoing coronary artery bypass graft surgery with impaired fibrinolytic activity and higher atherosclerotic scores face increased myocardial infarction risk. Longer aortic cross-clamp times also correlate with this risk.
Area of Science:
- Cardiovascular Surgery
- Thrombosis and Hemostasis
- Cardiac Surgery Outcomes
Background:
- Coronary artery bypass graft (CABG) surgery carries a risk of perioperative myocardial infarction (MI).
- Specific thrombotic profiles may predispose patients to MI during CABG.
- Understanding these risk factors is crucial for improving patient outcomes.
Purpose of the Study:
- To identify thrombotic and clinical factors associated with perioperative myocardial infarction in patients undergoing CABG.
- To investigate the relationship between atherosclerotic burden, coagulation, and fibrinolysis and MI risk.
Main Methods:
- Prospective study of 50 patients with stable angina pectoris undergoing CABG.
- Determination of thrombotic profiles, including protein C and tissue plasminogen activator levels.
- Analysis of clinical data including atherosclerotic scores, aortic cross-clamp time, and cardiac enzyme levels.
Main Results:
- 12 out of 50 patients experienced perioperative MI.
- MI patients exhibited higher atherosclerotic scores (P<0.02) and longer aortic cross-clamp times (P<0.05).
- Lower serum levels of protein C (P<0.05) and tissue plasminogen activator (P<0.01) were observed in MI patients, indicating impaired fibrinolytic activity.
Conclusions:
- Impaired endothelial fibrinolytic activity is a significant risk factor for myocardial infarction during CABG.
- Severe distal coronary atheroma and prolonged aortic cross-clamp times further increase MI risk.
- Identifying patients with these risk factors can aid in preventative strategies during cardiac surgery.
Abstract:
Patients with a particular thrombotic profile may be at greater risk of myocardial infarction during coronary artery bypass graft surgery. The thrombotic profile of 50 patients admitted to hospital with stable angina pectoris was determined prior to haemodynamic investigation. ECG results and determination of cardiac enzymes showed that 12 patients had suffered a perioperative myocardial infarction. These patients had a higher mean atherosclerotic score (42.1 +/- 10.5 vs 32.9 +/- 13, P less than 0.02), a longer aortic cross clamp time (59 +/- 15.2 vs 45.7 +/- 16.3 min, P less than 0.05), lower serum levels of protein C (101.2 +/- 26 vs 124.7 +/- 31.4%, P less than 0.05) and tissue plasminogen activator (322 +/- 580 vs 2307 +/- 2830 IU ml-1, P less than 0.01). There were no differences between the two groups in Jenkin's coronary score, the number and type of grafts, ejection fraction, left ventricular end-diastolic pressure, lipid profile or levels of markers of platelet release. In addition to a more severe distal coronary atheroma and a longer aortic cross-clamp time, patients with impaired endothelial fibrinolytic activity appeared to be at greater risk of myocardial infarction during coronary artery bypass graft surgery.
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