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Improved Arrhythmia Detection in Implantable Loop Recorders
Author(s) -
BRIGNOLE MICHELE,
BELLARDINE BLACK CARISSA L.,
THOMSEN POUL E. BLOCH,
SUTTON RICHARD,
MOYA ANGEL,
STADLER ROBERT W.,
CAO JIAN,
MESSIER MARC,
HUIKURI HEIKKI V.
Publication year - 2008
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/j.1540-8167.2008.01156.x
Subject(s) - medicine , asystole , implantable loop recorder , cardiology , qrs complex , algorithm , computer science , atrial fibrillation
Implantable loop recorders (ILR) have an automatic arrhythmia detection feature that can be compromised by inappropriately detected episodes. This study evaluated a new ILR sensing and detection scheme for automatically detecting asystole, bradyarrhythmia, and tachyarrhythmia events, which is implemented in the next generation device (Reveal DX/XT).Methods and Results:The new scheme employs an automatically adjusting R‐wave sensing threshold, enhanced noise rejection, and algorithms to detect asystole, bradyarrhythmia, and tachyarrhythmia. Performance of the new algorithms was evaluated using 2,613 previously recorded, automatically detected Reveal Plus episodes from 533 patients. A total of 71.9% of episodes were inappropriately detected by the original ILR, and at least 88.6% of patients had one or more inappropriate episodes, with most inappropriate detections due to R‐wave amplitude reductions, amplifier saturation, and T‐wave oversensing. With the new scheme, inappropriate detections were reduced by 85.2% (P < 0.001), with a small reduction in the detection of appropriate episodes (1.7%, P < 0.001). The new scheme avoided inappropriate detections in 67.4% of patients that had them with the original scheme.Conclusions:The new sensing and detection scheme is expected to substantially reduce the occurrence of inappropriately detected episodes, relative to that of the original ILR.