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Figure 1 Individual ECG tracings in 15 patients revealing the occurrence of spontaneous, sustained ventricular arrhythmias. These tracings were recorded by any standard 12-lead ECG (patients 1–3, 5, 7–13, 15), conventional monitor ECG recorders (patients 4, 6), or 24-h Holter monitoring (patient 14). II indicates lead II in standard 12-lead ECGs, and CC5 indicates lead CC5 in Holter monitoring. Patient number corresponds to the number in Table 2.