PMC3262500_01
(a) and (b) inappropriate auto-detection of asystole. (a) shows an example of inappropriate long-lasting (42 seconds) asystolic pause detection from signal loss artefact recorded soon after ILR implant. (b) shows another example of inappropriate detection of a briefer pause related to undersensing of ECG signal amplitude later detected.
CARDIOLOGY2011-146062.001.jpg
PMC3262500_01_CARDIOLOGY2011-146062.001.jpg
fig1
In 19 episodes, long phases of false asystole detection (up to 140 seconds of maximal duration) were related to signal loss artefact (Figure 1(a)). In 2 cases, inappropriate activation, which was recorded one month after ILR implant, was related to false asystole detection for brief undersensing of ECG signal amplitude (Figure 1(b)). In the remaining 9 events, recorded beginning from three days after the implant, inappropriate activation was due to false fast ventricular tachycardia detection related to noises (Figure 2).
Inappropriate auto-activation of fast ventricular tachycardia due to oversensing from signal noise artefact.
CARDIOLOGY2011-146062.002.jpg
PMC3262500_01_CARDIOLOGY2011-146062.002.jpg
fig2
In 2 cases, inappropriate activation, which was recorded one month after ILR implant, was related to false asystole detection for brief undersensing of ECG signal amplitude (Figure 1(b)). In the remaining 9 events, recorded beginning from three days after the implant, inappropriate activation was due to false fast ventricular tachycardia detection related to noises (Figure 2).