Chapter 4
Oversensing
When the device senses something it shouldn't: lead issues, myopotentials, T-wave and other oversensing that can trigger inappropriate therapy.
The cases
1Lead breakage on an older model2Recent device, lead malfunction, and SecureSense™ algorithm3Lead malfunction revealed by an electric shock4Oversensing of the T wave on an older model5New device, T wave oversensing, and SecureSense™ algorithm6New device, post-stimulation T wave oversensing, and SecureSense™ algorithm7Recent device, P wave oversensing, and SecureSense™ algorithm8Double counting of the R wave on an older model9New device, dual R-wave counting and SecureSense™ algorithm10Oversensing of a 50 Hz signal11Surgery and use of an electric scalpel12SecureSense™ algorithm and undersensing on the discrimination channel13SecureSense™ algorithm and loss of right ventricular capture
From Implantable Cardioverter Defibrillator — clinical cases based on tracings by P. Bordachar, M. Strik, A. Thiyagarajah, S. Ploux. Published by Cardiocases. Every numbered marker on a recording is explained in the list beneath it; tap a marker on the trace or an entry in the list.