Related Experiment Videos
Effects of coronary artery revascularization and perioperative myocardial infarction on left ventricular wall motion
Insights
Coronary artery bypass surgery can improve heart function, particularly regional wall motion. However, benefits are most evident when perioperative myocardial infarction (heart attack) is avoided.
Area of Science:
- Cardiology
- Cardiac Surgery
- Cardiovascular Research
Background:
- The impact of coronary artery revascularization and perioperative myocardial infarction on left ventricular function remains debated.
- Accurate assessment of perioperative myocardial infarction is crucial for understanding surgical outcomes.
Purpose of the Study:
- To quantitatively assess perioperative myocardial infarction using creatine kinase-MB (CK-MB) isoenzyme activity.
- To evaluate the effects of coronary artery bypass surgery on left ventricular wall motion and ejection fraction.
Main Methods:
- Studied 77 patients undergoing coronary artery bypass surgery.
- Quantified perioperative myocardial infarction via cumulative CK-MB isoenzyme activity.
- Assessed left ventricular function and coronary anatomy through angiography post-surgery.
Main Results:
- Overall global left ventricular ejection fraction remained unchanged post-surgery.
- Patients with all patent grafts showed improved regional wall motion and ejection fraction.
- A significant correlation was found between CK-MB activity and changes in ejection fraction.
Conclusions:
- Coronary artery bypass surgery can enhance regional left ventricular wall motion.
- The benefits of surgery are maximized when perioperative myocardial ischemic damage is absent.
- Minimizing perioperative myocardial infarction is key to achieving optimal surgical outcomes.
Abstract:
The effects of coronary artery revascularization and perioperative myocardial infarction on left ventricular wall motion are still controversial. In this study perioperative myocardial infarction was quantitatively estimated with the cumulative activity of the CK-MB isoenzyme in the perioperative period in a group of 77 consecutive patients undergoing coronary artery bypass surgery. After the operation (on average 9 +/- 1.8 months) all the patients were submitted to left ventricular and coronary angiography. Overall the global left ventricular ejection fraction was unchanged after the operation. The subgroup of patients with all patent grafts showed an improvement of both regional wall motion (P less than 0.05) and ejection fraction (from 58 +/- 13 to 64 +/- 13%, P less than 0.005); the number of angiographically abnormal left ventricular segments decreased from 28.5 to 16.6% (P less than 0.001). The cumulative activity of CK-MB enzyme was significantly correlated with the pre- and postoperative changes of ejection fraction (r = -0.51, P less than 0.01). Thus coronary artery bypass surgery can improve regional wall motion, but the likely benefit is observed in the absence of a perioperative myocardial ischemic damage.