It was reported that the patient with this cardiac resynchronization therapy defibrillator experienced two ventricular fibrillation episodes and went syncopal.The device did not deliver therapy.Boston scientific technical services was consulted and discussed that on the first episode, the vf ended before meeting vf duration and it was a no therapy event.On the second one, the vf ended while the device was charging, therefore, the shock was aborted.Ts noted 3 vf beats that were undersensed throughout the episode.Reprogramming options were discussed and performed for device optimization.No adverse patient effects were reported.At this time, this device remains in service.
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