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Figure 5 Examples of atrial antitachycardia (ATP). (A) Primary termination of regular atrial tachyarrhythmia (AT) (type I, cycle length 260 ms) by burst-plus pacing. (B) Primary termination of type I AT (cycle length 250 ms) by ramp pacing. (C) Secondary termination of type I AT (cycle length 250 ms). After the last paced beat, there are four AT cycles before the AT ceases. Details are from stored AT episodes immediately before first ATP (with AEG) and during last ATP (no AEG available) (paper speed 25 mm/s). AP = atrial pace; AS = atrial sense; FDI = fibrillation detection interval; FS = fibrillation sense; TF = tachycardia/fibrillation (overlap zone); VP = ventricular pace; VS = ventricular sense.