Asymmetric cerebral embolic load and postoperative cognitive dysfunction in cardiac surgery

Area of Science:

• Neuroscience
• Cardiovascular Surgery
• Cognitive Science

Background:

• Cerebral embolic load is a known risk factor for cognitive dysfunction.
• The impact of asymmetric embolic distribution on specific cognitive domains requires further investigation.

Purpose of the Study:

• To investigate the effects of asymmetric cerebral embolic load on cognitive functions in patients undergoing open heart surgery (OH) versus coronary artery bypass grafting (CABG).

Main Methods:

• Neuropsychological testing and transcranial Doppler were used to assess cognitive function and microembolic load.
• Thirty-six OH patients and 26 CABG patients were included in the study.

Main Results:

• Open heart surgery (OH) patients exhibited a significantly higher microembolic load compared to coronary artery bypass grafting (CABG) patients.
• In OH patients, left middle cerebral artery embolic load correlated with verbal memory decline, while right middle cerebral artery load correlated with nonverbal memory deficits.
• CABG patients experienced postoperative verbal memory decline, linked to cardiopulmonary bypass duration, not microembolic load.

Conclusions:

• Significant microembolic loads during OH can cause distinct cognitive impairments depending on the cerebral region affected.
• Atherosclerotic patients are particularly susceptible to perioperative ischemia in the left temporal region.