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Diastolic pressure ratio (dPR): new approach and validation versus the instantaneous wave-free ratio (iFR).

Nov 7, 2000 · We hypothesized that calculation of the ratio of the diastolic driving pressure of a stenotic LAD to its normal value, namely diastolic FFR (d-FFR), might provide precise insight into the mechanism of FFR for assessment of the functional severity of the stenosis.

Learn about the DFR methodology and analysis, including how it compares to iFR in accuracy and clinical outcomes.

All resting indices — including Pd/Pa, DFR (dPR) and iFR — provide clinically equivalent results and all indices in the diastolic pressure ratio (dPR) class are numerically identical and verified by clinical evidence. Compare options in resting indices here.

Diastolic Hyperemia-free ratio (DFR) (Boston Scientific) is a resting diastolic index based on 2 criteria: identifying portion of cardiac cycle below the average aortic pressure, and selecting samples with negative slope.

Mar 1, 2024 · We evaluated the diagnostic performance of the DFR compared with invasive fractional flow reserve (FFR). We performed a prospective, single-center study of 308 patients (343 lesions) who underwent DFR and FFR for evaluation of visually estimated 40% …

Nov 5, 2019 · Boston Scientific has introduced a new resting index called the diastolic hyperemia-free ratio (DFR) that is comparable to iFR (instantaneous wave-free ratio) values, as demonstrated in the analysis of 893 waveform tracings from 833 patients in the VERIFY 2 1 and CONTRAST 2 studies.

RFR: Resting full-cycle ratio; DFR: Diastolic hyperemia-free ratio; dPR: Diastolic pressure ratio. The retrospective VALIDATE study showed the diagnostic comparability between resting full-cycle ratio (RFR) and iFR.

Mar 5, 2023 · There is limited data validating diastolic hyperemia-free ratio (DFR) against invasive fractional-flow reserve (FFR) in real-world clinical settings. We evaluated the diagnostic performance of DFR compared to FFR.