微循环阻力指数临床应用的新进展

Recent progress of microcirculatory resistance index in clinical application

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。

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.