PMC3859824_01
Initial ventricular arrhythmia detection parameters, with SVT criteria as shown.
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The patient record showed a previous slow VT (at ~115 bpm), for which overdrive pacing was efficient; accordingly, programming was "too valiant" and was performed to detect slow VT at rates >100 bpm, fast VT (FVT) >150 bpm (via VT), and ventricular fibrillation (VF) >188 bpm (Fig. 1).
After first efficient therapy for FVT (burst), five inappropriate therapies occurred, including three shocks of 10.0 J, 19.7 J, and 29.9 J.
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ATP (burst), followed by five ITs, including three shocks during the redetection phase (Fig. 2). After the last shock, therapy was exhausted and the episode was regarded as persistent for more than 1 hour, until the heart rate slowed down below 100 bpm.