The index of microcirculatory resistance ( IMR) can be measured readily and simultaneously with fractional flow reserve ( FFR) , and is a comprehensive integrated assessment for the epicardial and microvascular compartments of the coronary circulation .In contrast to other invasive and non-invasive tests , this method is known to be stable and reproducible under various hemodynamics and even in the presence of coronary artery stenosis .This review summarized the theoretical basis , operation skills , and the clinical practice of IMR.%微循环阻力指数(IMR)易于操作,并可同时测定冠状动脉血流储备分数(FFR),以综合评估心外膜冠状动脉和微循环的功能,与其他有创性和无创性方法相比,其不受血流动力学和冠状动脉病变的影响。本文主要介绍IMR的理论基础、操作技巧及临床应用。
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