Original title: 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. Reference: Sayan Sen et al. J Am Coll Cardiol 2013;61:1409–20. When considering revascularization, measuring lesion functional compromise is known to improve clinical outcomes...