Device EGM with atrial sense (top panel), ventricular sense (middle panel) and discrimination channel (RV coil to can, bottom panel above the marker channel). The displayed EGM shows atrial sense followed by biventricular pacing (BP). During inhibition of RV pacing due to non-sustained oversensing the EGM shows an underlying high degree AV block. First three RV markers (A) are unbinned non-matching intervals indicated using ‘–‘ and X markers. The fourth marker (B) shows a 100% morphology match binned interval in the VT-2 zone. The next markers show atrial sensing (AS) and biventricular pacing followed by a set of markers (C) showing atrial sensing (AS) followed by overlapping VS and VP marker. These markers overlap due to the different sensitivity settings programmed for bradycardia and tachycardia. Another example of overlapping VS and VP is shown after two AS – BP markers (D). This is also the start of an asystole of 2.2 seconds due to inhibition of ventricular pacing because of sensing the noise signal and binning it as intervals in the VT-2 zone. After a couple of seconds the SecureSense™ algorithm declares non-sustained oversensing (NSO) by comparing the near field signal with the far field (E).