oversensing
Inappropriate detection of non-cardiac signals or cardiac signals from unintended sources by pacemaker or ICD leads.
Full Definition
Oversensing represents a device malfunction where pacemakers or ICDs inappropriately detect electrical signals that should not trigger device responses. This can include myopotentials from muscle activity, electromagnetic interference, lead fractures causing noise, T-wave oversensing, or cross-chamber sensing between atrial and ventricular leads. In pacemakers, oversensing typically results in inappropriate inhibition of pacing, potentially causing symptomatic bradycardia. In ICDs, oversensing can lead to inappropriate shock delivery for non-life-threatening rhythms. Management strategies include adjusting sensitivity settings, filtering parameters, lead repositioning, or programming modifications to distinguish true cardiac signals from artifacts.
Usage
Usage note: Specify the source of oversensing when known; distinguish from undersensing problems.
In Context
- "Oversensing of diaphragmatic myopotentials caused inappropriate pacing inhibition." — Device troubleshooting report
- "Lead fracture resulted in noise oversensing and multiple inappropriate ICD therapies." — Emergency device evaluation