Predictive value of total ischemic time and T1 mapping after emergency PCI in acute ST-segment elevation myocardial infarction

ST-segment elevation myocardial infarction (STEMI) remains a major cause of morbidity and mortality worldwide, effective risk stratification is crucial for the management of STEMI. This study sought to investigate the predictive value of total ischemic time (symptom onset to balloon, S2B), native T1 and extracellular volume (ECV) in STEMI patients undergoing primary percutaneous coronary intervention (PCI). We found regardless of microvascular obstruction (MVO) or not, ECV in myocardial infarction (ECVMI) was significantly correlated with S2B time, while native T1 was not. In the 4-month follow-up, ECVMI was independently associated with final larger infarct size in multivariable regression analysis.