Differences in coronary microcirculation measurements during regadenoson vs. adenosine - induced hyperemia.

Background: Little is known about the similarity of microcirculation assessment outcomes performed with regadenoson and adenosine. The aim of the current study was to compare coronary flow reserve (CFR) and index of microcirculatory resistance (IMR) assessment using adenosine and regadenoson, and to evaluate predictors regarding the size of differences.

Methods: 44 patients were enrolled and diagnosed between 2021 and 2023.