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Stroke following coronary artery bypass grafting: a ten-year study
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The risk of stroke after coronary artery bypass grafting (CABG) increased due to older patients. Key risk factors include advanced age, cerebrovascular disease, and severe aortic atherosclerosis.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Vascular Medicine
Background:
- Coronary artery bypass grafting (CABG) is a common cardiac procedure.
- Stroke is a significant complication following CABG.
- Understanding stroke risk factors is crucial for patient outcomes.
Purpose of the Study:
- To identify risk factors for stroke during CABG.
- To analyze trends in stroke rates over time.
- To determine patient characteristics associated with increased stroke risk.
Main Methods:
- Retrospective review of 3,279 isolated CABG patients (1974-1983).
- Case-control study of 56 stroke victims and 112 controls.
- Univariate analysis to identify significant risk factors.
Main Results:
- Stroke rate increased from 0.57% to 2.4%, largely due to increased patient age.
- Significant risk factors: advanced age, cerebrovascular disease, severe ascending aorta atherosclerosis, prolonged bypass time, and severe hypotension.
- No correlation found with prior myocardial infarction, hypertension, or diabetes.
Conclusions:
- Increasing patient age is a primary driver of rising stroke risk post-CABG.
- Elderly patients with cerebrovascular disease or severe aortic atherosclerosis face elevated stroke risk.
- Identifying and managing these risk factors can potentially reduce postoperative stroke incidence.
Abstract:
To identify possible risk factors for the occurrence of stroke during coronary artery bypass grafting (CABG), the cases of 3,279 consecutive patients having isolated CABG from 1974 to 1983 were reviewed. During this period, the risk of death fell from 3.9% to 2.6%. The stroke rate, however, fell initially but then rose from 0.57% in 1979 to 2.4% in 1983. Adjustment of these data for age clearly demonstrated that the risk of stroke has increased largely because of an increase in the mean age of patients undergoing CABG procedures. A case-control study involving all 56 stroke victims and 112 control patients was used to identify those risk factors significantly associated with the development of stroke in univariate analysis: increased age (63 versus 57 years in stroke patients and controls, respectively; p less than 0.0001); preexisting cerebrovascular disease (20% versus 8%; p less than 0.03); severe atherosclerosis of the ascending aorta (14% versus 3%; p less than 0.005); protracted cardiopulmonary bypass time (122 minutes versus 105 minutes; p less than 0.005); and severe perioperative hypotension (23% versus 4%; p less than 0.0001). Other variables not found to correlate with postoperative stroke included previous myocardial infarction, hypertension, diabetes mellitus, lower extremity vascular disease, preoperative left ventricular function, and intraoperative perfusion techniques. Elderly patients who have preexisting cerebrovascular disease or severe atherosclerosis of the ascending aorta or who require extensive revascularization procedures have a significantly increased risk of postoperative stroke.