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Reduced rate of microembolism by optimized aortic cannula position does not influence early postoperative cognitive
Wolfgang Müllges1, Dorothea Franke, Wilko Reents
1Department of Neurology, Julius Maximilians University, Würzburg, Germany. wolfgang.muellges@mail.uni-wuerzburg.de
Insights
An elongated aortic cannula during coronary artery bypass grafting (CABG) reduced microemboli but did not significantly improve early cognitive function in this pilot study.
Area of Science:
- Cardiovascular Surgery
- Neuropsychology
- Medical Devices
Background:
- Coronary artery bypass grafting (CABG) can lead to microemboli.
- Aortic cannula positioning may influence embolus formation.
- Reducing microemboli is a potential strategy to improve patient outcomes.
Purpose of the Study:
- To evaluate if an elongated aortic cannula in the aorta descendens reduces microemboli during CABG.
- To determine if this technique improves early neuropsychological outcomes post-surgery.
- To assess the correlation between reduced emboli and cognitive performance.
Main Methods:
- Prospective randomized study of 60 elective CABG patients.
- Comparison between short aorta ascendens cannula and elongated aorta descendens cannula.
- Neuropsychological testing pre- and post-surgery; transcranial Doppler for embolus detection in a subgroup.
Main Results:
- The elongated cannula group showed significantly reduced microembolic signals (median 174.5 vs. 413.0, p=0.011).
- No significant difference in overall cognitive performance between groups, except for the letter cancellation test favoring the elongated cannula group at discharge (p=0.025).
- In the subgroup with Doppler, cognitive scores did not differ between cannula groups.
Conclusions:
- Elongated aortic cannula placement effectively reduces brain microembolism during CABG.
- Despite reduced emboli, this technique did not significantly improve overall early cognitive performance in this pilot study.
- Further research is needed to explore the long-term cognitive effects and optimal cannula strategies.
Background And Purpose:
The number of microemboli as measured by Doppler ultrasound during coronary artery bypass grafting (CABG) can be reduced by positioning the arterial cannula into the aorta descendens. The aim of this study was to prospectively evaluate whether this alternative aortic cannulation procedure leads to better neuropsychologic outcome early after surgery along with embolus reduction.
Methods:
Sixty patients with elective CABG were randomized to either using a short aorta ascendens cannula or an elongated cannula placed in the aorta descendens. All patients were tested by seven neuropsychologic tests preoperatively. Intraoperative embolus detection could be performed by transcranial Doppler in 32 patients. The neuropsychologic tests could be repeated serially until the 9th postoperative day in 54 patients. Patient groups did not differ in terms of preoperative psychometric performance and of the surgical characteristics except cannula positioning. All data were analyzed by a blinded assessor.
Results:
Neuropsychologic test scores showed in all individual patients a transient decline with subsequent recovery, but did not differ significantly between the groups except for the letter cancellation test at discharge favoring the patients with the longer cannula (102.3 +/- 11.6 vs. 94.5 +/- 11.5 mean +/- SD; p = 0.025). In the subgroup who had Doppler sonography, neuropsychologic test scores did not differ between the groups. However, microembolic signals were markedly reduced in patients with the elongated cannula (median 174.5 vs. 413.0; p = 0.011).
Conclusions:
Though reducing brain microembolism, use of an elongated aortic cannula does not appear to influence overall cognitive performance early after CABG in this pilot study.