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To the editor:A 48-year-old female patient was hospitalized for precordial pain.The examination on admission showed no positive signs,normal blood values,marked T-wave inversion in leads V1-V5,and abnormal left ventricular anterior wall motion with a left ventricular ejection fraction (LVEF) of 59％.She was diagnosed as unstable angina with NYHA grade 0.She received routine treatment but still had frequent episodes of angina pectoris.ECG revealed deeper T-wave inversion and coronary angiography revealed triple-vessel lesions.On-pump coronary artery bypass grafting (CABG) was performed after 20 hours of intra-aortic balloon pump (IABP) support.