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[Microembolizatoins during heart surgery under extracorporeal circulation]
A Thiel1, M Zimmer, W A Stertmann
1Abteilung Anaesthesiologie und operative Intensivmedizin am Ostalbklinikum Aalen.
Summary
This study found no link between microembolic signals (MES) during heart surgery and cognitive decline. Further research is needed to distinguish emboli types for better understanding of cerebral dysfunction after cardiac procedures.
Area of Science:
- Neurology
- Cardiology
- Neurosurgery
Background:
- Transcranial Doppler sonography (TCD) detects microembolic signals (MES) during cardiac surgery.
- MES are believed to represent embolic events with potential neuro-psychiatric consequences.
Purpose of the Study:
- To determine the neuro-psychiatric consequences of intraoperative MES.
- To investigate the relationship between MES and postoperative cognitive function.
Main Methods:
- 25 patients undergoing elective aorto-coronary bypass grafting (ACBG) or aortic valve replacement (AVR) were studied.
- Neuropsychiatric testing was performed pre- and postoperatively.
- MES counts were correlated with intraoperative parameters and cognitive test results.
Main Results:
- Aortic valve replacement (AVR) patients exhibited significantly more MES than ACBG patients.
- MES counts did not correlate with postoperative neuropsychiatric test results.
- No significant deterioration in neuropsychiatric state was observed in relation to high MES counts.
Conclusions:
- The study did not find evidence of postoperative neuropsychiatric decline linked to intraoperative MES.
- Future research should differentiate between gaseous emboli and particles detected by TCD.
- Distinguishing emboli types may be crucial for understanding cerebral dysfunction post-cardiac surgery.