Figure 5.

Virtual 12‐lead electrocardiogram (ECG), frequency graph of premature atrial contraction (PAC) and paroxysmal atrial fibrillation (PAF), and trace of atrial late potential before and after radiotherapy for Case 5. Hourly counts in the graph showed a remarkable decrease from preirradiation (white bars) to postirradiation (black bars) during the day. Two criteria for atrial late potentials are shown: the filtered P‐wave duration (fPd); and the root mean square voltage of the terminal 20 ms of the filtered P wave (RMS20). This was negative at baseline, but demonstrated an improvement to within the normal range after carbon‐ion irradiation