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Figure 4 Ventricular arrhythmias recorded by Data Sciences International (DSI). Parts A and B show 24-h histograms of the atrial and ventricular rates, respectively. Time 0 corresponds to 12:00 AM. There were numerous high-rate events in the morning (between the two arrows). (C) Example of nonsustained ventricular tachycardia recorded by the DSI system. The arrows indicate the P waves.