The Official Journal of EuroPCR and the European Association of Percutaneous Coronary Interventions (EAPCI)

LETTER TO THE EDITOR

Reconsideration of a mathematical model for post-stenting fractional flow reserve in a tandem lesion with a side branch

EuroIntervention 2018;13:2077. DOI: 10.4244/EIJV13I17A338

Department of Cardiovascular Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan


I read with interest the paper by Kweon and colleagues1 in which they proposed a prediction model for post-stenting fractional flow reserve (FFR) in a tandem lesion with a side branch. The authors derived the following two equations that predicted the FFR after treatment of distal (Equation 1) or proximal stenosis (Equation 2):

(1)

(2)

where w=Pa/(Pa−Pw)=1.33 and k=Q1/Q0. Their efforts are praiseworthy; however, they committed a serious error in their calculation. The authors calculated the hyperaemic coronary flow to each branch by using the P=QR equation. The problem is that the authors always ...

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