To assess the outcomes of patients with ST-segment elevation myocardial infarction (STEMI) assigned to fractional flow reserve (FFR) and angiography-guided selective percutaneous coronary intervention (PCI).

The investigators retrospectively collect STEMI patients received selective PCI from Jan 2012 to Dec 2015. Clinical follow-up is performed from the date of FFR assessment to Dec 2016 or death, which is up to 5 years. The primary endpoint is major adverse cardiac events, composite of cardiac death, reinfarction and unplanned hospitalization due to cardiovascular reasons. The primary endpoints are cardiac death, reinfarction and unplanned hospitalization due to cardiovascular reasons. All deaths are considered cardiovascular unless an unequivocal noncardiac cause could be established. Reinfarction is defined as myocardial infarction after the PCI procedure. Unplanned hospitalization will be present only if the patient is hospitalized unexpectedly because of persisting or increasing complaints of angina, ventricular arrhythmias and heart failure. All patients were received FFR-guided PCI or angiography-guided PCI before enrollment, and the investigators do not assign specific interventions to the subjects during the study. So this study might be considered to be observational.

Inclusion Criteria:

• age>18 years
• documented acute ST-segment elevation myocardial infarction
• onset of symptom >6 days before percutaneous coronary intervention
• eligible for PCI

Exclusion Criteria:

• cardiogenic shock or hemodynamic instability
• highly tortuous or calcified arteries
• infarct related artery with a diameter < 2.5mm
• a life expectancy< 2 years
• intolerance to anti-platelet drugs
• left main disease (≥ 50% stenosis)
• contraindication to adenosine
• hypertrophic cardiomyopathy

patients with ST-segment elevation myocardial infarction received selective percutaneous coronary intervention