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Implantable Loop Recorder (implantable + loop_recorder)

Distribution by Scientific Domains

Medical Sciences	100%

Selected Abstracts

Electromagnetic Interference in an Implantable Loop Recorder Caused by a Portable Digital Media Player

PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 10 2008
JAY P. THAKER
The implantable loop recorder has been shown to be a cost-effective tool for diagnosis of intermittent cardiovascular symptoms such as syncope and palpitations. Electromagnetic interference in these recorders may be caused by commonly encountered electronic devices such as antitheft electronic surveillance systems and magnetic resonance imaging cameras. In this report, we describe interference in two patients with implantable loop recorders from a portable digital media player. [source]

Feasibility of Magnetic Resonance Imaging in Patients with an Implantable Loop Recorder

PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 3 2008
JORGE A. WONG M.D.
Background: The implantable loop recorder (ILR) is a useful tool in the diagnosis of syncope. Our understanding of their functional and safety profile in interfering environments such as magnetic resonance imaging (MRI) becomes increasingly important as they become more prevalent. Methods: We report four patients with an ILR who underwent MRI. The ILR memory was cleared before MRI and no changes were made to programmed settings. Device interrogation took place immediately after the scan. Patients were surveyed for device movement and heating, in addition to cardiopulmonary symptoms after their MRI. Results: Following MRI scanning, all patients were asymptomatic and no device movement or heating was observed. In addition, the functionality of the device remained unaffected. Artifacts mimicking arrhythmias were seen in all ILR patients regardless of the type of MRI scan. Conclusions: MRI scanning of ILR patients can be performed without harm to patient or device, but artifacts that could be mistaken for a tachyarrhythmia are seen frequently. [source]

Electromagnetic Interference of an Implantable Loop Recorder by Commonly Encountered Electronic Devices

PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 10 2000
CAREL C. DE COCK
De COCK, C.C., et al.: Electromagnetic Interference of an Implantable Loop Recorder by Commonly Encountered Electronic Devices. Electromagnetic interference of pacemaker systems has been well established and can lead to an inappropriate function of these devices. Recently, an implantable loop recorder (ILR) (REVEAL, Medtronic Inc.) has been introduced to evaluate the possible arrhythmic etiology of patients with recurrent syncope. We evaluated the interference of this device in two patients with implantable ILR and in three nonimplanted ILRs with four electromagnetic sources: cellular phones (GSMs), electronic article surveillance systems (EASs), metal detector gates (MDGs), and magnetic resonance imaging (MRI). The GSM did not affect appropriate function of the ILR whereas radiofrequency (RF) EAS could interfere with normal function in implanted and nonimplanted systems. The MDG had no influence on ILR function. The magnetic field induced by the MRI resulted in an irreversible error in one nonimplanted ILR. Therefore, although interference between electromagnetic sources and ILRs appears to be rare in our study, physicians should be aware of possible malfunctioning of these devices. [source]

Experience With Implantable Loop Recorders for Recurrent Unexplained Syncope

CONGESTIVE HEART FAILURE, Issue 2008
Michele Brignole MD
Knowledge of what occurs during spontaneous syncope is the gold standard for evaluation. Initially, implantable loop recorders (ILRs) were used in patients with unexplained syncope at the end of unsuccessful full, conventional work-up. In pooled data regarding 247 patients, a correlation between syncope and electrocardiographic findings was found in 84 patients (34%); of these, 52% had a bradycardia or asystole at the time of the recorded event, 11% had tachycardia, and 37% had no arrhythmia. Presyncope-electrocardiography correlation was observed in another third of the patients; presyncope was much less likely to be associated with an arrhythmia than was syncope. The diagnostic yield was similar in patients with and without structural heart diseases and was higher in older than in younger patients. Recent studies showed that ILR implantation can be safely performed in an early phase of the diagnostic evaluation,provided that patients at risk for life-threatening events are carefully excluded,in the patients who have a severe presentation of syncope (because of high risk of trauma or high frequency of episodes) which can be a benefit of a mechanism-specific therapy. Congest Heart Fail. 2008;14:7,12. ©2008 Le Jacq [source]

Improved Arrhythmia Detection in Implantable Loop Recorders

JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 9 2008
MICHELE BRIGNOLE M.D.
Introduction: 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. [source]

All is Not Lost: Utilizing Continuous Remote ILR Monitoring to Diagnose Syncope

PACING AND CLINICAL ELECTROPHYSIOLOGY, Issue 6 2010
PAUL S. G. HONG M.D.
A 63-year-old man with frequent unexplained syncope was implanted with a second generation remotely monitored implantable loop recorder for continuous electrocardiogram (ECG) monitoring. He had a subsequent syncopal episode and despite accidental destruction of his patient activator, vital ECG data from the event were transmitted wirelessly, enabling a cardiac arrhythmia to be excluded. This case highlights the benefit of remote monitoring in syncope assessment, as well as a transmission system that ensures prompt analysis of the ECG data and therefore rapid optimal patient management. (PACE 2010; 33:763,765) [source]