Hyperhomocysteinemia-induced myocardial injury after coronary artery bypass

Area of Science:

• Cardiology
• Vascular Medicine
• Biochemistry

Background:

• Hyperhomocysteinemia is linked to vascular oxidative stress and cardiovascular disease.
• Atherosclerotic risk factors contribute to cardiovascular complications.
• Myocardial ischemia-reperfusion injury is a concern after cardiac surgery.

Purpose of the Study:

• To investigate the impact of preoperative plasma homocysteine levels on myocardial ischemia-reperfusion injury.
• To assess the influence of other atherosclerotic risk factors in this context.
• To determine predictors of myocardial injury following coronary artery bypass surgery.

Main Methods:

• Prospective enrollment of 213 patients with normal renal function undergoing coronary artery bypass.
• Measurement of preoperative plasma homocysteine and assessment of atherosclerotic risk factors.
• Postoperative measurement of cardiac troponin T to quantify myocardial injury.

Main Results:

• A significant association was found between hyperhomocysteinemia and elevated postoperative peak troponin T.
• This relationship was more pronounced in patients lacking major atherosclerotic risk factors.
• Multivariate analysis identified hyperhomocysteinemia, hypertension, and aortic crossclamp time as predictors of myocardial injury, with risk factors paradoxically modifying homocysteine's effect.

Conclusions:

• Preoperative hyperhomocysteinemia is an independent predictor of myocardial ischemia-reperfusion injury after coronary artery bypass.
• The presence of major atherosclerotic risk factors alters the impact of hyperhomocysteinemia on myocardial injury.
• Managing homocysteine levels may be crucial for reducing cardiac damage in specific patient groups.