It was reported that the holter data showed different ventricular morphologies for the patient with this cardiac resynchronization therapy defibrillator (crt-d).Technical services (ts) provided their insights on potential causes and suggested further evaluation of the device system.Ts reviewed the reports and noted that the auto-thresholds were stable but potentially exhibited loss of capture (loc).Ts stated that further testing would be needed to confirm capture.Ts also reviewed the auto-threshold test and questioned if the device clock was accurate.A data analysis was performed, and ts noted that the clock was inaccurate due to daylight savings time.It was confirmed that the two morphologies were due to the auto-threshold test.The device remains in use.No adverse patient effects were reported.
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