Intracoronary Administration of Glucocorticoids as a Treatment Method for No-Glucocorticoid Treatment for No-Reflow in STEMI

The goal of this clinical trial is to improve reperfusion therapy in STEMI patients with no-reflow phenomenon. Based on literature review and pathological studies, the investigators believe that myocardial ischemia-reperfusion injury is primarily due to myocardial edema, which is angiographically manifested by the no-reflow. To restore blood flow, high-dose intracoronary methylprednisolone was applied. The main idea is to stabilize cell membranes and stop the progression of edema. It is local, not systemic, single administration that avoids serious side effects. The primary hypothesis is that hormone administration will improve blood flow to TIMI 2/3 in TIMI 0/1after stenting infarct-related artery.