Lead Integrity Alert Triggered by T-wave Oversensing
Asad A Aboud1, Walter K Clair1
1Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN, USA.
Summary
T-wave oversensing (TWOS) in pacemakers can cause pauses and shocks. This case shows TWOS triggering a lead alert without actual lead failure, highlighting a diagnostic challenge.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Device Technology
Background:
- T-wave oversensing (TWOS) is a known issue in cardiac implantable electronic devices (CIEDs).
- It can lead to inappropriate device therapies, including pauses and shocks.
- Accurate differentiation between oversensing and lead malfunction is crucial for patient management.
Observation:
- A case is presented involving TWOS in a patient with a pacemaker/defibrillator.
- The oversensing event falsely triggered the Lead Integrity Alert system.
- No actual lead failure or impedance abnormalities were detected.
Findings:
- TWOS can mimic lead integrity issues, leading to false alerts.
- The Lead Integrity Alert system may be sensitive to non-pathological electrograms.
- This highlights the importance of comprehensive diagnostic evaluation beyond automated alerts.
Implications:
- Clinicians must be aware that T-wave oversensing can trigger lead integrity alerts.
- This necessitates careful interpretation of device alerts in the context of patient electrograms.
- Improved algorithms may be needed to differentiate oversensing from true lead problems.
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