Conclusions: The coronary artery ectasia is also a main reason that myocardial ischemic, electrocardiogram to change.

Result Improvement of symptoms of angina pectoris, ECG and myocardial ischemia in treatment group were superior to those in control group ( P< 0.05).

The primary end point was the occurrence of myocardial ischemia, defined as transient electrocardiographic abnormalities, release of troponin t, or both, within 30 days after surgery.