Routinely Deferred Versus Early Invasive Strategy in Chinese Patients of 75 Years or Older With Non-ST-elevation Myocardial Infarction - a Multicenter, Open-label, Randomized Controlled Clinical Trial.

This study aims to enroll 696 elderly patients with non-ST elevation myocardial infarction (NSTEMI) from 20 hospitals throughout mainland China.. Consective patients of 75 years or older with a diagnosis of NSTEMI will be suitable for enrollment. Written informed consent form will be obtained from every patients. Initially stabilized patients with an ischemic episode within 24 hours before admission will be randomized and others will be registered. For randomization, the patients' brief information will be entered in a central randomization system to generate a random number.

According to the random number, each patient will be randomly assigned to early invasive therapy versus routinely deferred invasive strategy. All patients will initiate dual antiplatelet therapy (aspirin+P2Y12 inhibitor) and continued till the end of follow-up at one year. For patients assigned to early invasive group, a loading dose of antiplatelet agent should be given, unless contraindicated. Anticoagulation, anti-ischemic agents, statin and other guideline recommended medicine will be given according to physician in charge according to guideline.

Patients assigned to early invasive strategy will undergo coronary angiography within 24 hours after admission and have percutaneous coronary intervention or coronary artery bypass grafting as soon as possible during the index hospitalization if appropriate. Patients assigned to deferred invasive strategy will undergo coronary angiography and subsequent revascularization after at lest 72 hours after admission and in the index hospitalization. Patients who undergo percutaneous coronary intervention can receive a glycoprotein IIb/IIIa inhibitor if indicated and upfront use of glycoprotein IIb/IIIa inhibitors is discouraged. The choice of intervention or surgery and the choice of complete or staged revascularization will be determined by the operator according to coronary anatomy and consistent with current practice guidelines. Patients assigned to deferred strategy should undergo urgent coronary angiography and revascularization accordingly if indicated during the period of time waiting for catheterization. Such procedure will be adjudicated as an endpoint. Elective percutaneous coronary intervention on non-culprit vessels, in either study arm, can take place sometime after the index procedure with the goal to achieve complete revascularization. Such staged procedures will not be deemed as an adverse event.

Specific data for acquisition:

Research demographics: age, height, weight, body mass index, medications at randomization, pertinent medical/family/social history, i.e., hypertension, hypercholesterolemia, diabetes mellitus, current tobacco use, history of prior myocardial infarction, PCI or CABG. This data will be gathered by research coordinator through interviewing patient and checking patient's medical record.