title: FFR prediction model based on conventional quantitative coronary angiography and the amount of myocardium subtended by an intermediate coronary artery stenosis.
abstract: BACKGROUND
  Coronary angiography has poor predictive value for functionally significant coronary artery stenosis. The Fractional Flow Reserve (FFR) currently represents the gold standard to define the ischemic potential of epicardial stenosis and, recently, the instantaneous wave-free ratio (iFR), has also been introduced as alternative to the FFR, but it still remains an invasive procedure. We aimed this study in order to evaluate the accuracy of the "Angiography-DeriveD hEmoDynamic index" (ADDED index) to predict the FFR as compared with the iFR.
  
  
  RESULTS
  Consecutive patients with at least one equivocal stenosis in one major coronary artery were enrolled. Both the FFR and iFR were measured. The amount of jeopardized myocardium was evaluated using the Duke Jeopardy Score (DJS). Two-dimensional quantitative coronary angiography (QCA) was used to assess the angiographic features of the coronary stenosis and both the reference vessel diameter (RVD) and minimal lumen diameter (MLD) were calculated. The ADDED index was defined as the ratio between DJS and MLD. We evaluated 100 intermediate coronary artery stenoses in 83 patients. Both FFR and iFR inversely correlated with the ADDED index (respectively, r2=0.59, p<0.001 and r2=0.61, p<0.001). This latter also showed high accuracy in predicting the FFR value (ROC analysis: 0.94[0.90-0.99], p<0.001) as well as the iFR (0.91[0.86-0.97], p<0.001, difference: 0.03 SD 0.04, p=0.52).
  
  
  CONCLUSIONS
  The ADDED index, taking into account both the MLD and DJS, showed high accuracy to predict FFR and it might be used to detect functionally significant coronary artery stenosis.
authors.affiliation: Division of Cardiology, Department of Advanced Biomedical Sciences, University of Naples "Federico II", Naples, Italy; Division of Cardiology, P.O. Di Venere, 70123 Bari, Italy. Electronic address: luigidiserafino@msn.com.
authors.forename: Luigi
authors.initials: L
authors.lastname: Di Serafino
authors.affiliation: Division of Cardiology, P.O. V. Emanuele II, 76011 Bisceglie, Italy.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Scognamiglio
authors.affiliation: Division of Cardiology, P.O. Di Venere, 70123 Bari, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Turturo
authors.affiliation: Division of Cardiology, Department of Advanced Biomedical Sciences, University of Naples "Federico II", Naples, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Esposito
authors.affiliation: Department of Medicine, University of Salerno, 84081 Salerno, Italy.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Savastano
authors.affiliation: Division of Cardiology, P.O. Di Venere, 70123 Bari, Italy.
authors.forename: Saverio
authors.initials: S
authors.lastname: Lanzone
authors.affiliation: Division of Cardiology, Department of Advanced Biomedical Sciences, University of Naples "Federico II", Naples, Italy.
authors.forename: Bruno
authors.initials: B
authors.lastname: Trimarco
authors.affiliation: Division of Cardiology, P.O. Di Venere, 70123 Bari, Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: D'Agostino
mesh_terms: D017023:Coronary Angiography / Q000379:methods*; D023921:Coronary Stenosis / Q000150:complications / Q000175:diagnosis* / Q000503:physiopathology; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D053805:Fractional Flow Reserve, Myocardial / Q000502:physiology*; D006334:Heart Function Tests / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017682:Myocardial Stunning / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D011237:Predictive Value of Tests; D011379:Prognosis; D012189:Retrospective Studies; D012720:Severity of Illness Index
keywords: Coronary angiography; FFR; Jeopardy score; iFR