ABC | Volume 114, Nº2, February 2020

Original Article Vieira et al. Evaluation myocardial ischemia with iFR Arq Bras Cardiol. 2020; 114(2):256-264 Figure 3 – Classification tree for the logistic regression model 2; stent implantation was observed in 7.5% of patients with moderate stenosis and iFR (instantaneous wave-free ratio) ≤ 0.87. > 0.87 ≤ 0.87 IFR p < 0.001 1 2 LesaoMod p = 0.043 0 1 Node 3 (n = 18) Node 4 (n = 8) Node 5 (n = 69) 1 1 0.8 0.6 0.4 0.2 0 1 0.8 0.6 0.4 0.2 0 1 0.8 0.6 0.4 0.2 0 0 1 0 1 0 83.3% 16.7% 62.5% 37.5% 17.4% 82.6% Figure 4 – Box Plot of the iFR (instantaneous wave-free ratio) values for moderate and severe lesions considering the presence of stents. Median iFR was 0.92 (0.82‑0.94) in moderate lesions and 0.79 (0.61-1.00) in severe lesions. 1.0 0.9 0.8 IFR 0.7 0.6 Stent implantation Moderate lesion Severe lesion 261