Microvascular resistance reserve: impact on health status and myocardial perfusion after revascularization in chronic coronary syndrome.

Background And Aims: The microvascular resistance reserve (MRR) is a novel invasive index of the microcirculation, which is independent of epicardial stenoses, and MRR has both diagnostic and prognostic implications. This study investigates whether MRR is associated with health status outcomes by revascularization in patients with moderate coronary stenoses.

Methods: Consecutive patients with stable chest pain and moderate (30-90% diameter) stenoses on invasive coronary angiography (n=222) underwent invasive physiology assessment.