Figure 2.

Virtual 12‐lead electrocardiogram (ECG), frequency graph of premature ventricular contraction (PVC), and trace of ventricular late potential before and after radiotherapy for Case 4. PVC observed on the 12‐lead ECG occurred from the right ventricle outflow tract. Hourly counts in the graph showed a remarkable decrease from preirradiation (white bars) to postirradiation (black bars). Three criteria for late potentials are shown: the filtered QRS duration (fQRS); the duration of the terminal low‐amplitude signal <40 μV (LAS40); and the root mean square voltage of the terminal 40 ms of the fQRS (RMS40). These criteria changed from positive to negative after carbon‐ion irradiation