Chenguang Li, Jing Wu, Jiayan Lin, Yizhe Wu, Rende Xu, Juying Quian, William Kongto Hau, Emanuele Barbato, Nils J Johnson, Barry Hennigan, Colin Berry, Keith G Oldroyd, Liang Song, Junbo Ge
OBJECTIVES: The instantaneous wave-free ratio (iwFR) has limited availability. A new resting index called the constant-resistance ratio (cRR), which dynamically identifies cardiac intervals with constant and minimum resistance, has been developed; however, its diagnostic performance is unknown. The aim of this study was to validate the cRR by retrospectively calculating the cRR values from raw pressure waveforms of 2 publicly available datasets and compare them with those of the iwFR...
March 27, 2024: Journal of Invasive Cardiology