This crt-p was thoroughly inspected and analyzed upon receipt at our quality assurance laboratory.
External visual inspection of the device noted tool marks on the header; no other anomalies were found.
The battery status was at beginning of life (bol) with a voltage of 2.
994 volts and the device¿s operating power levels were within normal parameters.
A review of the device memory confirmed that the device was in safety mode status and that several lv low rate pacing monitor alerts were recorded.
A telemetry reset command was then issued with an engineering-level programmer to remove the device from safety mode status and program the device back into primary operation.
A series of automated electrical and functional tests were performed; the device passed all testing requirements, sensing and pacing functions were verified.
Deeper engineering analysis of the device memory confirmed that this device experienced a lv low rate pacing monitor reset due to a programming interaction involving a large positive lv offset when the rvat test and atr mode switch occurred on the same cardiac cycle.
The large positive lv offset allowed enough time after the rv pace for the rvat test to be started and then aborted due to an atr.
This, in turn, caused the scheduled lv pace to be canceled when the device was starting to change bradycardia parameters while the temporary rvat test parameters were still enabled.
This situation occurred two more times, each within 48 hours of the previous reset, thus triggering the device to enter into safety mode.
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