Brain emboli distribution and differentiation during cardiopulmonary bypass

Area of Science:

• Neurology
• Cardiovascular Surgery
• Biomedical Engineering

Background:

• Cardiopulmonary bypass (CPB) is essential for cardiac surgery but linked to cerebral injury and neurocognitive issues.
• Cerebral microembolism during CPB is a primary suspected cause of these neurological complications.

Purpose of the Study:

• To investigate cerebral microembolism during cardiac surgery.
• To analyze microembolic load, type, and distribution based on different CPB circuits and procedures.

Main Methods:

• Retrospective observational clinical study at a single center.
• Fifty-five patients undergoing elective cardiac surgery with CPB.
• Bilateral middle cerebral artery monitoring using multifrequency transcranial Doppler.

Main Results:

• Significant differences observed in solid versus gaseous microemboli, with gaseous emboli being more numerous.
• The number of solid microemboli was influenced by the CPB circuit type, CPB phase, and laterality.
• Gaseous microemboli were affected by CPB circuit type and CPB phase, but not laterality.

Conclusions:

• The type of cardiopulmonary bypass circuit used significantly affects the occurrence, nature, and distribution of cerebral microemboli.
• CPB circuit configuration, rather than the duration of the bypass phase, is the key determinant of microembolic load.