Does cardiopulmonary bypass change serum neuron-specific enolase levels?

Area of Science:

• Cardiovascular Surgery
• Neuroscience
• Biochemistry

Background:

• Cardiopulmonary bypass (CPB) is a critical component of open-heart surgery.
• The impact of CPB on neurological function and biomarkers like neuron-specific enolase (NSE) in patients without pre-existing deficits requires clarification.
• Serum NSE is a marker for neuronal damage.

Purpose of the Study:

• To investigate the sole effect of extracorporeal circulation on serum NSE levels.
• To assess changes in serum NSE in patients undergoing open-heart surgery without clinically observed neurological deficits.

Main Methods:

• Prospective study of 32 patients undergoing elective open-heart surgery.
• Clinical neurological assessment preoperatively and on postoperative days 1 and 2.
• Serial serum NSE, hemoglobin, and hematocrit measurements were taken preoperatively, immediately post-CPB, and 24 and 48 hours postoperatively.
• Statistical analysis included Friedman's Test, Tukey test, and Pearson correlation.

Main Results:

• No significant differences in serum NSE levels were observed at any measurement time point (preoperative, post-CPB, postoperative days 1 and 2).
• No significant correlation was found between serum NSE levels and CPB duration, aortic cross-clamping time, age, or blood product transfusion.
• Postoperative hematocrit and hemoglobin levels also showed no significant correlation with NSE values.

Conclusions:

• CPB in uncomplicated open-heart surgery patients did not lead to a significant increase in serum NSE levels.
• The study suggests that CPB, in the absence of neurological complications, does not cause detectable neuronal or blood cell damage reflected by NSE.
• Further research may explore NSE changes in patients with neurological deficits post-CPB.