DescriptionCoronary flow velocity and microvascular resistance over the wave-free period.jpg
English: The flow velocity, pressure, and instantaneous microvascular resistance were calculated over the wave-free period and during that of the complete cardiac cycle. Flow velocity is higher, and pressure is lower over the wave-free period. This results in lower microvascular resistance during the wave-free period in comparison to the complete cardiac cycle. Values are expressed as median+/-interquartile range.
Sen S, Asrress KN, Nijjer S, et al. Diagnostic classification of the instantaneous wave-free ratio is equivalent to fractional flow reserve and is not improved with adenosine administration. Results of CLARIFY (Classification Accuracy of Pressure-Only Ratios Against Indices Using Flow Study). J Am Coll Cardiol 2013;61:1409–20.
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