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Predictors associated with stroke after coronary artery bypass grafting: a systematic review
Zhifeng Mao1, Xiaonan Zhong1, Junjie Yin1
1Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600 Tianhe Road, Guangzhou, China.
Insights
Predicting stroke after coronary artery bypass grafting (CABG) is crucial. Advanced age, prior stroke, carotid stenosis, peripheral vascular disease, unstable angina, longer bypass times, and atrial fibrillation are key predictors of perioperative stroke.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Public Health
Background:
- Stroke is a significant complication following coronary artery bypass grafting (CABG), contributing to morbidity and mortality.
- Identifying predictors of perioperative stroke is essential for patient risk stratification and management.
Purpose of the Study:
- To systematically review and evaluate the predictors of perioperative stroke after CABG.
- To synthesize findings from studies utilizing multivariate regression models to identify prognostic factors.
Main Methods:
- Systematic review of published literature on prognostic factors for perioperative stroke post-CABG.
- Inclusion of studies employing multivariate regression models.
- Qualitative synthesis and assessment of statistical validity of prognostic models.
Main Results:
- Fourteen studies were reviewed, with variable methodological quality.
- Stroke incidence ranged from 1.1% to 5.7%, with 37-59% occurring intraoperatively.
- Consistent predictors included advanced age, prior cerebrovascular disease/stroke, carotid stenosis, peripheral vascular disease, unstable angina, prolonged cardiopulmonary bypass, and postoperative atrial fibrillation.
Conclusions:
- Seven key variables indicate a high atherosclerotic burden and are associated with increased perioperative stroke risk after CABG.
- The study highlights the need for standardized stroke assessment scales in post-CABG evaluations.
- Findings offer insights for improving future research on stroke prediction in CABG patients.
Background:
Stroke is a major cause of morbidity and mortality after coronary artery bypass grafting (CABG). The purpose of this systematic review was to evaluate the predictors of perioperative stroke after CABG.
Methods:
We reviewed the published literature on prognostic factors for perioperative stroke after CABG in articles using multivariate regression models. The statistical validity of prognostic models and a qualitative synthesis were performed.
Results:
We identified 14 studies. The methodological quality of study reporting was variable. Overall, the incidence of stroke after CABG was 1.1-5.7%. About 37-59% of strokes occurred early (intraoperatively). No validated stroke outcome scale was used to assess morbidity and mortality in any of the included studies. Advanced age, prior (before CABG) cerebrovascular disease/stroke, prior carotid artery stenosis, prior peripheral vascular disease, prior unstable angina, and prolonged cardiopulmonary bypass time were found to be the most consistent independent predictors of perioperative stroke after CABG. Postoperative atrial fibrillations were found to be the most consistent independent variables associated with postoperative stroke after CABG. No association was found with hypercholesterolemia, prior myocardial infarct, and smoking. Other risk factors, such as gender, prior hypertension, diabetes mellitus, congestive heart failure, and chronic renal failure, showed inconsistent results.
Conclusions:
Seven variables (advanced age, prior cerebrovascular disease/stroke, prior carotid artery stenosis, prior peripheral vascular disease, prior unstable angina, prolonged cardiopulmonary bypass time, and postoperative atrial fibrillation), representing and high atherosclerotic burden, were found to be associated with more perioperative stroke events. Stroke assessment scales should be included to enable a detailed description of stroke morbidity post CABG. Lessons learned from the present study should also help to improve the quality and relevance of future studies on prognostic factors in stroke after CABG.
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