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Failure to treat ventricular tachycardia or ventricular fibrillation by implantable cardioverter-defibrillators.
Heart Rhythm
August 2024
Smidt Heart Institute, Cedars Sinai Medical Center, Los Angeles, California.
Article Synopsis
- * Researchers analyzed data from the FDA's MAUDE database from 2019-2023, identifying 854 reports involving deaths, injuries, and malfunctions related to normally functioning ICDs.
- * The most frequent reasons for these failures included misclassification of VT as other conditions (like SVT or AF) and undersensing issues, with undersensing linked to a significant portion of deaths, highlighting the need for further investigation and solutions.
Paradoxical under-sensing of atrial lead at high sensitivity setting in dual chamber pacemaker during atrial flutter - What is the mechanism?
Indian Pacing Electrophysiol J
August 2024
Department of Cardiology, RTIICS, Kolkata, India.
The causes of atrial undersensing in a dual chamber pacemaker include true undersensing (low amplitude electrogram), functional undersensing (related to the effect of special timing cycles in the presence of an adequate signal) and paradoxical undersensing. This case report describes paradoxical atrial undersensing at a higher programmed atrial sensitivity and with the return of normal atrial sensing at a lower programmed sensitivity.
View Article and Find Full Text PDFInappropriate ventricular pacing-induced ventricular fibrillation in a long QT type 3 syndrome patient with implantable cardioverter-defibrillator.
HeartRhythm Case Rep
August 2024
Department of Cardiorenal and Cerebrovascular Medicine, Faculty of Medicine, Kagawa University, Kagawa, Japan.
Left bundle branch pacing (LBBP) has been subject to increasing interest over the last few years due to its capacity for physiological conduction and its advantages compared to His bundle pacing. His bundle pacing has certain limitations, such as a small pacing area for the His bundle, a high threshold that leads to battery depletion, a low R-wave amplitude that may result in atrial or His oversensing, and ventricular signal undersensing. In this case series, four patients (two female and two male) aged 62.
View Article and Find Full Text PDFVDD pacemaker: An effective and reliable physiological pacing modality in elderly patients.
Pacing Clin Electrophysiol
April 2023
Department of Cardiology, Coimbra University Hospital Centre, Coimbra, Portugal.
Background: In elderly patients, single chamber pacing may be considered. For sinus rhythm patients, VDD pacemaker (PM), by preserving atrial sensing, is a more physiological mode than VVI devices. This study aims to evaluate the long-term performance of VDD PM in elderly patients with atrioventricular block (AVB).
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