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Figure 5 Spontaneous Onset of Atrial Flutter in a Patient
The 2 tracings in each panel are continuous and show electrocardiography (ECG) lead II recorded simultaneously with a bipolar right atrial (RA) electrogram (AEG). (Top panel) The * denotes a premature atrial beat, which induces atrial fibrillation (AF). (Middle panel) The AF continues until, at the *, atrial flutter develops. (Bottom panel) The stable AFL continues. Time lines are at 1-s intervals. II = lead II. Reprinted, with permission, from Waldo and Cooper (6).