Figure 2.

Original concept of UHF-ECG modified with permission from Jurak et al. [46]. Representative UHF-ECG during a LBBB (left) and normal (right) ventricular activation. A. Averaged UHF-ECG computed from multiple heart beats. B. Averaged UHF amplitude envelopes for 500–1000 Hz. C. Schematic interpretation of myocardial cell action potentials. D. Corresponding UHF-ECG visualization of activation per precordial lead. Red indicates the time (horizontal axis) and location (vertical axis) when most myocardial cells are activated simultaneously. In the initial studies, data from six precordial leads were utilized. In the current application, up to eight precordial leads can now be employed to assess the inferolateral wall.