Response by Piroth et al to Letter Regarding Article, “Prognostic Value of Fractional Flow Reserve Measured Immediately After Drug-Eluting Stent Implantation”

We thank Dr Uretsky et al for suggesting to check for potential differences in baseline characteristics and-more importantly-in outcome between patients with and patients without post-percutaneous coronary intervention fractional flow reserve (post-PCI FFR) measurements. It is indeed likely that procedural characteristics, not captured by the case record form, may have influenced the operator to decide to perform or not to perform the final FFR measurements. Checking for these differences in outcome might increase the generalizability of the conclusions. We will therefore perform this analysis in the near future.