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Validation of dual-chamber pacemaker diagnostic data using dual-channel stored electrograms
Bernd Nowak1, James McMeekin, Marie Knops
1Cardiovascular Center Bethanien, CCB, Frankfurt/Main, Germany. b.nowak@ccb.de
Pacing and Clinical Electrophysiology : PACE
|July 13, 2005
Summary
Pacemaker diagnostic counters often misclassify events. Stored electrograms (EGMs) confirm triggers in only 62% of cases, highlighting the need for validation before programming changes.
Area of Science:
- Cardiology
- Biomedical Engineering
- Medical Device Technology
Background:
- Pacemaker diagnostic counters are crucial for device management but prone to event misclassification.
- Intracardiac electrograms (EGMs) offer a potential method for validating these diagnostic data.
Purpose of the Study:
- To evaluate the accuracy of pacemaker diagnostic counter data using stored intracardiac electrograms (EGMs).
- To assess the reliability of event triggers in dual-chamber pacemakers.
Main Methods:
- A multicenter study involving 351 patients with dual-chamber pacemakers.
- Analysis of 1,003 stored EGMs triggered by atrial tachycardia (AT), ventricular tachycardia (VT), sudden bradycardia response (SBR), and pacemaker-mediated tachycardia (PMT).
- Classification of triggers as 'confirmed' or 'false positive' based on EGM content.
Main Results:
- Overall confirmation rate for triggers was 62%.
- High confirmation for SBR (100%) and AT (62%), but lower for VT (18%) and PMT (54%).
- False-positive triggers (45%) resulted from far-field sensing, noise, myopotentials, sinus tachycardias, double counting, exit block, and undersensing.
Conclusions:
- Stored EGMs are valuable for validating pacemaker diagnostic counter data.
- Therapeutic decisions based on pacemaker diagnostics require validation with advanced tools like stored EGMs.
- Relying solely on diagnostic counters can lead to inappropriate patient management.