It was reported that this patient was in the emergency room in ventricular fibrillation (vf) and the device did not treat.The device was interrogated and review found that the rhythm did appear to be vf, where the egm was very fine in some spots and big in others.The device had detected the rhythm and delivered anti-tachycardia pacing (atp) and started to charge, however it appears that the shock therapy was diverted due to some undersensing of the fine vt.The device had failed to reconfirm and shock therapy was not provided.Technical services discussed that the device was still set to nominal settings, and to consider making it more sensitive.The device remains in-service.No adverse patient effects were reported.
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