Myonecrosis following isolated coronary artery bypass grafting is common and associated with an increased risk of...

Area of Science:

• Cardiology
• Cardiac Surgery
• Biomarkers

Background:

• Coronary artery bypass grafting (CABG) is a common surgical procedure.
• Assessing long-term mortality risk after CABG is crucial for patient management.
• The role of post-operative cardiac enzyme elevation in predicting long-term outcomes requires further clarification.

Purpose of the Study:

• To evaluate the association between post-operative elevation of creatine kinase-MB (CK-MB) and long-term mortality risk.
• To determine if CK-MB levels after first-time isolated CABG can serve as a predictor of long-term survival.

Main Methods:

• A registry analysis of 3667 patients undergoing first-time isolated CABG between 1992 and 2001.
• Single CK-MB measurements were obtained approximately 15.2 hours post-CABG.
• Long-term mortality was the primary endpoint, with a mean follow-up of 5.1 years.

Main Results:

• Patients with elevated CK-MB levels showed significantly lower event-free survival rates.
• Event-free survival decreased as CK-MB levels increased above the upper limit of normal (ULN).
• Post-operative CK-MB elevation was a significant independent predictor of long-term mortality (p=0.007).

Conclusions:

• Elevation of the CK-MB isoenzyme is a significant predictor of long-term mortality following CABG.
• Routine measurement of CK-MB after bypass surgery can aid in stratifying long-term patient risk.
• These findings support the clinical utility of CK-MB monitoring in post-CABG care.