It was reported that this patient presented to the emergency room (er) for a syncopal event.Physician contacted technical services (ts) for review of stored ventricular episodes on this cardiac resynchronization therapy defibrillator (crt-d).Upon review, it was found that this patient experienced two episodes of ventricular fibrillation (vf) where the signal amplitude was too small for detection and under sensed.Also, there was an event of ventricular tachycardia (vt) for which this crt-d delivered one burst of anti-tachycardia pacing (atp); however, the therapy did not convert the rhythm and it slowed below detection.It was also noted that the pacing lead impedance (pli) of the left ventricular (lv) lead was found to be out-of-range at 2341 ohms.Ts recommended programming optimization and cardiology evaluation.It was noted that device therapy was turned off by applying a magnet over the device.No additional adverse patient effects were reported.Currently, this crt-d remains in service.
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