undersensing

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Fatal Undersensing of Ventricular Fibrillation due to Intermittent High-Amplitude R Waves.

Anguera I, Sabaté X, Sugrañes G, Cequier A.SourceCardiovascular Diseases Group (Bellvitge Biomedical Research Institute) IDIBELL, Bellvitge University Hospital-ICS, L'Hospitalet de Llobregat, Barcelona, Spain.
Pacing and clinical electrophysiology : PACE.Pacing Clin Electrophysiol.2011 Dec 21. doi: 10.1111/j.1540-8159.2011.03270.x. [Epub ahead of print]
A 48-year-old man was admitted after an episode of aborted sudden death with external defibrillation. An implantable cardioverter defibrillator implanted 2 years before for secondary prevention failed to sense properly an episode of ventricular fibrillation. Interrogation of the device showed large
PMID 22188442

Long-term follow-up of DDD and VDD pacing: a prospective non-randomized single-centre comparison of patients with symptomatic atrioventricular block.

Marchandise S, Scavée C, le Polain de Waroux JB, de Meester C, Vanoverschelde JL, Debbas N.SourceDivision of Cardiology, Department of Cardiovascular Diseases, Cliniques Universitaires St-Luc, Université Catholique de Louvain, Avenue Hippocrate, 10-2888, B-1200 Brussels, Belgium.
Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology.Europace.2011 Nov 8. [Epub ahead of print]
AimsThis prospective non-randomized single-centre registry compared clinical outcome, pacing parameters, and long-term survival in patients receiving VDD or DDD pacemaker (PMs) for symptomatic atrioventricular (AV) block.Methods and resultsSingle-lead VDD (n= 166) and DDD (n= 254) PMs were implanted
PMID 22071380

Common pitfalls in interpreting pacemaker electrocardiograms in the emergency department.

Venkatachalam KL.SourceMayo Clinic Jacksonville Florida, Division of Cardiology, Jacksonville, FL, USA. venkat.KL@mayo.edu
Journal of electrocardiology.J Electrocardiol.2011 Nov-Dec;44(6):616-21. Epub 2011 Sep 9.
The number of patients receiving pacemakers and defibrillators has grown substantially over the last 20 years. In addition, the complexity and sophistication of these devices have increased, making diagnosis of pacemaker problems using the electrocardiogram (ECG) more difficult for clinicians in the
PMID 21907995

Decrease in Amplitude of Intracardiac Ventricular Electrogram and Inappropriate Therapy in Patients With an Implantable Cardioverter Defibrillator

Watanabe Hiroshi,Chinushi Masaomi,Izumi Daisuke,Sato Akinori,Okada Shinsuke,Okamura Kazuki,Komura Satoru,Hosaka Yukio,Furushima Hiroshi,Washizuka Takashi,Aizawa Yoshifusa
International Heart Journal 47(3), 363-370, 2006
… A low R-wave can cause not only undersensing of ventricular tachyarrhythmia but also inappropriate discharges due to oversensing of unexpected signals because of its characteristic sensing algorithm. …
NAID 130000068705