Clinical experience of two Israeli Medical Centers with the implantable loop recorder in patients with syncope: From diagnosis to treatment

Ehud Kadmon, Doron Menachemi, Jairo Kusniec, Moti Haim, Michael Geist, Boris Strasberg

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Background: The implantable loop recorder (ILR) is an important tool for the evaluation of unexplained syncope, particularly in cases of rarely occurring arrhythmia. Objectives: To review the clinical experience of two Israeli medical centers with the ILR. Methods: We reviewed the medical records of patients with unexplained syncope evaluated with the ILR at Rabin Medical Center (2006-2010) and Wolfson Medical Center (2000-2009). Results: The study group included 75 patients (44 males) followed for 11.9 ± 9.5 months after ILR implantation. Patients' mean age was 64 ± 20 years. The ILR identifed an arrhythmic mechanism of syncope in 20 patients (17 bradyarrhythmias, 3 tachyarrhythmias) and excluded arrhythmias in 12, for a diagnostic yield of 42.7%. It was not diagnostic in 17 patients (22.7%) at the time of explant; 26 patients (34.7%) were still in follow-up. In two patients ILR results that were initially negative were reversed by later ILR tracings. The patients with bradyarrhythmias included 9 of 16 (56.3%) with surface electrocardiogram conduction disturbances and 2 of 12 (16.7%) with negative findings on carotid sinus massage. All bradyarrhythmic patients received pacemakers; the seven patients for whom post-intervention data were available had no or mild symptoms. Conclusions: The ILR has a high diagnostic yield. Pre-ILR findings correlating with the ILR results are conduction disturbances (positive predictor of arrhythmia) and negative carotid sinus massage results (negative predictor of arrhythmia). Proper patient instruction is necessary to obtain accurate results. Caution is advised when excluding an arrhythmia on the basis of ILR tracings, and long-term follow-up is warranted.

Original languageEnglish
Pages (from-to)488-492
Number of pages5
JournalIsrael Medical Association Journal
Volume14
Issue number8
StatePublished - 1 Aug 2012
Externally publishedYes

Keywords

  • Arrhythmias
  • Conduction disturbances
  • Implantable loop recorder (ILR)
  • Pacemakers
  • Syncope

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