Manual Carotid Compression is a Viable Alternative for Reduction of Cerebral Microemboli
Paul Isingoma1, Juyeun Moon1, Karen May-Newman2
1Bioengineering Program, College of Engineering, San Diego State University, 5500 Campanile Dr., San Diego, CA, 92182-1323, USA.
Insights
Brief carotid artery compression during cardiopulmonary bypass (CPB) significantly reduces cerebral emboli by over 75%. This simple technique shows promise for preventing stroke after cardiovascular surgery.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Biomedical Engineering
Background:
- Stroke is a serious risk following cardiovascular surgeries, especially those using cardiopulmonary bypass (CPB).
- Embolic particles can travel to the brain during CPB, causing stroke.
- Manual carotid artery compression is a proposed, but not widely used, method for cerebral protection during CPB.
Purpose of the Study:
- To evaluate the effectiveness of carotid artery compression in reducing cerebral emboli using an in vitro model.
- To quantify the reduction in embolic particles with varying compression durations.
Main Methods:
- An in vitro model simulating the aortic arch and cardiovascular circuit was used.
- Fluorescent particles were introduced into the circulation to mimic emboli.
- Particle counts in the aorta and arch vessels were measured with and without carotid compression (10, 15, 20 seconds).
Main Results:
- A 10-second carotid compression reduced embolic particles entering the carotid arteries by over 75%.
- Compression durations of 15-20 seconds did not offer additional particle reduction compared to 10 seconds.
Conclusions:
- Brief compression of the common carotid arteries can significantly decrease cerebral emboli during cardiovascular procedures.
- This non-invasive technique warrants further investigation for its potential in stroke prevention.
Background:
Stroke is a devastating complication of cardiovascular surgeries, and the risk is particularly high for those requiring cardiopulmonary bypass (CPB). Embolic particles generated during the unclamping of the aortic cross-clamp may enter the cerebral circulation, lodging in small vessels. External manual compression of the carotid arteries is a non-invasive technique that has been proposed for cerebral protection during CPB procedures but is not widely deployed.
Methods:
The aim of this study is to assess the potential for cerebral emboli reduction with carotid compression using an in vitro model. Experiments were performed with a glass aortic arch model in a mock cardiovascular circuit. Small fluorescent particles were released into the circulation with and without carotid compression, and the particles visualized in the aortic midplane. The number of particles in the aorta and arch branch vessels were counted from the images before, during and following the release of carotid compression for durations of 10, 15 and 20 s. A gamma variate function was fit to the data to describe the bolus dynamics.
Results:
Carotid compression for 10 s reduces the number of embolic articles entering the carotid arteries by over 75%. A compression duration of 15-20 s does not result in greater particle reduction than one of 10 s.
Conclusion:
Brief compression of the common carotid arteries during cardiovascular interventions has the potential to dramatically reduce the number of cerebral emboli and should be investigated further.
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