Central-nervous-system dysfunction after warm or hypothermic cardiopulmonary bypass

Area of Science:

• Cardiovascular Surgery
• Neuropsychology
• Anesthesiology

Background:

• Warm heart surgery is gaining popularity.
• The impact of cardiopulmonary bypass (CPB) temperature on cognitive function post-cardiac surgery requires assessment.

Purpose of the Study:

• To evaluate the effect of normothermic versus hypothermic CPB on neuropsychological function in patients undergoing coronary artery bypass grafting (CABG).

Main Methods:

• A randomized trial involving 34 patients comparing normothermic (mean 34.7°C) and hypothermic (mean 27.8°C) CPB.
• Patients underwent psychomotor and memory testing before and after surgery.
• Nasopharyngeal temperature was monitored during CPB.

Main Results:

• Postoperative scores in all seven neuropsychological tests were superior in the normothermic CPB group.
• A statistically significant improvement was observed in trial-making test A (p < 0.023) for the normothermic group.
• No significant difference in overall neurological function was found, suggesting comparable outcomes.

Conclusions:

• Normothermic CPB in cardiac surgery does not appear to negatively impact neurological function.
• Warmer CPB temperatures may offer advantages for cognitive recovery after coronary surgery.
• Further research is warranted to confirm the benefits of normothermic CPB on neuropsychological outcomes.