It was reported that during an emergency room (er) visit, the health care professional (hcp) called technical services (ts) and requested a review and evaluation of this cardiac resynchronization therapy defibrillator (crt-d) system.It was noted that the patient collapsed and was rescued using an external device.Upon review of the stored ventricular episodes, ts was able to determine that patient ventricular arrhythmia appeared to fall below the programmed therapy threshold and remained in the monitor only zone which led to the syncopal episode.Ts discussed device programming optimization options.Further review of the egm, ts noted intermittent loss of capture (loc) on the right ventricular (rv) channel and undersensing on the right atrial (ra) channel.At this time, the crt-d, ra and rv leads remain in service.No additional adverse patient effects were reported.
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