Chin-Yu Lin et al. JACEP 2016;2:459-470 Time-Frequency Analysis of Bipolar EGM During SR and Extraventricular Beats (A) The high-frequency components (depicted within the red box) of bipolar electrograms remained consistent during sinus rhythm (SR) and right ventricular (RV) pacing. (B) Scatter plot of SAFE-T values during SR and extraventricular beats showed strong correlation (Pearson correlation: 0.918; p value < 0.001). (C) Bland-Altman plot. CI = confidence interval; HHT = Hilbert-Huang transform; PVB = premature ventricular beats; other abbreviations as in Figures 1 and 2. Chin-Yu Lin et al. JACEP 2016;2:459-470 American College of Cardiology Foundation