It was reported that the cardiac resynchronization therapy pacemaker (crt-p) exhibited invalid data for a false alert for left ventricular (lv) lead impedance measurement that was below the threshold limit, which resulting in a polarity switch.A review of lead trend data confirmed the measurement was within normal limits.However, data also showed there was just one measurement below the threshold resulting in the alert and polarity switch.The device remains in use.The lv lead was reprogrammed back to the previous vector.No patient complications have been reported as a result of this event.
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The lead was not returned for analysis, however, performance data collected from the device was received and analyzed.Analysis of the device memory indicated the impedance of the left ventricular pacing lead was below the expected lower range.Analysis of the device memory indicated a polarity switch.If information is provided in the future, a supplemental report will be issued.
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