Left Ventricular Global Longitudinal Strain and Postoperative Myocardial Injury

Inclusion Criteria:

1. Age 65-90;
2. According to the European Heart Association's diagnostic criteria for chronic coronarysyndrome in 2019.Patients with suspected coronary heart disease and stable anginapectoris, with or without dyspnea; New heart failure or left ventricular dysfunction,suspected coronary heart disease; Patients with acute coronary syndrome who areasymptomatic or stable within one year of onset, or who will undergo revascularizationin the near future;Patients with an initial diagnosis or revascularization for morethan one year, with or without symptoms; Angina pectoris, suspected vasospasm, ormicrovascular disease patients; During screening, asymptomatic people with coronaryheart disease were discovered;
3. ASA IIIII; NYHA IIIII; require general anesthesia;
4. no history of anesthetic allergy;
5. agreed to participate in the study and signed the informed consent form.

Exclusion Criteria:

1. Congenital heart disease, severe ventricular arrhythmia, atrial fibrillation, severevalvular regurgitation;
2. Severe history of chronic obstructive pulmonary illness (COPD severity III or IV),individuals with severe or uncontrolled bronchial asthma, pulmonary infection,bronchiectasis;
3. Patients with persistent drinking and known or suspected abusers of other narcoticanalgesics;
4. Obese (BMI 30 kg/m2)
5. Cardiac surgical procedures are planned.