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Cerebral microemboli during coronary artery bypass using different cardioplegia techniques
A J Baker1, B Naser, M Benaroia
1Department of Anaesthesia, St. Michael's Hospital, University of Toronto, Ontario, Canada.
The Annals of Thoracic Surgery
|May 1, 1995
Summary
This study found that while overall microembolic events during coronary artery bypass grafting were similar across cardioplegia techniques, warm retrograde cardioplegia showed higher immediate embolic events. These findings are crucial for understanding neurologic outcomes.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Medical Engineering
Background:
- Transcranial Doppler echocardiography detects microemboli linked to adverse neuropsychological outcomes post-coronary artery bypass grafting (CABG).
- Neurologic outcome disparities after CABG are often attributed to variations in cardioplegia techniques.
Purpose of the Study:
- To investigate and compare the rate and number of microembolic events during CABG using three distinct cardioplegia techniques: cold antegrade, warm antegrade, and warm retrograde.
- To identify specific stages of the CABG procedure where microembolic event rates differ based on cardioplegia strategy.
Main Methods:
- Continuous monitoring for transcranial Doppler-detected microembolic events during CABG in patients receiving cold antegrade (n=20), warm antegrade (n=17), or warm retrograde (n=20) cardioplegia.
- Monitoring encompassed stages from aortic cannulation to chest closure, including bypass initiation, aortic clamping, and declamping.
Main Results:
- Total microembolic events per patient (22-2,072) were comparable across all cardioplegia groups.
- Microembolic event rates and totals at each procedural stage were generally similar between groups.
- Total embolic events peaked during aortic clamping, with the highest rate occurring at bypass initiation.
- Immediate embolic events were significantly higher in the warm retrograde group compared to both antegrade groups during aortic declamping.
Conclusions:
- While overall microembolic event burdens were similar, the warm retrograde cardioplegia technique demonstrated a higher incidence of immediate embolic events during aortic declamping.
- The findings suggest potential differences in embolic event profiles among cardioplegia techniques, warranting further investigation into their impact on neurologic outcomes.