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急性ST段抬高型心肌梗死(STEMI)发病是斑块破裂，继之血栓形成，血管的急性闭塞导致的。有些急性心肌梗死(AMI)的患者，虽然通过血运重建治疗使梗死相关冠状动脉开通，但由于相关冠状动脉的微循环出现“无复流”现象，使近期和远期的心血管事件发生率和病死率增加；相反，有些AMI患者虽然相关冠状动脉仍闭塞，但其灌注区的心肌微循环却可由侧支循环得到灌注，使抬高的ST段下降，因此在探讨急性心肌梗死的诊疗过程中，冠状动脉微循环的结构和功能改变应该是重要的研究领域。越来越多的证据表明，冠状动脉微循环在心肌的血供中起着重要作用，通过使用热稀释压力导管，微循环阻力指数(IMR)可以测得并量化微循环的功能，因此IMR是反映微循环的特异性指标。而且IMR不同于传统评估方法，有着操作简便、可重复性强、特异性高等多重优势。近年来关于IMR的研究突飞猛进，很多已知与STEMI有关的指标和IMR的相关性研究也不断发展。本文就目前有关STEMI患者中IMR相关性的研究进展进行综述。“,”Acute ST segment elevation myocardial infarction(STEMI) is caused by plaque rupture, followed by thrombosis and acute occlusion of blood vessels.In some patients with acute myocardial infarction(AMI), although infarction-related coronary arteries are opened by revascularization, there is no reflow due to the associated coronary microcirculation.Increase the incidence and mortality of short-term and long-term cardiovascular events.On the contrary, although the associated coronary artery is still occluded in some AMI patients, the myocardial microcirculation in the perfusion area can be perfused by collateral circulation, resulting in the decrease of the elevated ST segment.Therefore, in the process of diagnosis and treatment of AMI, paying attention to the structural and functional changes of coronary artery microcirculation should be an important research field.More and more evidence shows that coronary artery microcirculation plays an important role in myocardial blood supply.Through the use of thermal dilution pressure catheter, microcirculation resistance index (IMR) can measure the function of microcirculation.IMR is a specific index to reflect microcirculation, which is different from the traditional evaluation method, and has multiple advantages, such as simple operation, strong repeatability, high specificity and so on.In recent years, the research on the correlation of IMR is advancing by leaps and bounds.This paper reviews the current research progress on the correlation of IMR in STEMI.