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Figure 1 Intracardiac electrograms retrieved during follow-up from one patient developing monomorphic VT. Shown are the stored intracardiac recordings of the 10 s preceding arrhythmia detection (top panel), the 10 s preceding therapy delivery (middle panel) and the 10 s following therapy delivery (lower panel). (Top panel) During one episode of atrial fibrillation, a ventricular extrabeat induces a regular VT with a heart rate of 225 beats/min. (Middle panel) Ongoing VT. (Lower panel) After shock delivery, atrial fibrillation is observed.
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