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Figure 2 Examples of atrial tachycardia pacing. (A) A ramp pacing therapy terminates atrial tachycardia with immediate restoration of atrial-paced rhythm. This episode is classified as a primary termination. The upper tracing shows atrial and ventricular electrograms. The lower tracing illustrates the marker channel annotations and intervals between sensed or paced events. (B) Device-based atrial fibrillation terminates within 2.6 s of delivery of a 50-Hz Burst train. The format is similar to A. AP = atrial-paced event; AR = atrial-sensed event in the refractory period; AS = atrial-sensed event; FD = fibrillation detected; TD = tachycardia detection; TS = tachycardia-sensed; VP = ventricular-paced event; VS = ventricular-sensed event.
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