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Automatic capture verification in ICD lead systems using intracardiac ventricular evoked response and reduced
J Sperzel1, H F Pitschner, T Schwarz
1Kerckhoff-Klinik, Department of Cardiology and Electrophysiology, Benekestrasse 2-8, 61231, Bad Nauheim, Germany. Johannes.Sperzel@kerckhoff.med.uni-giessen.de
Summary
Reduced coupling capacitance (CC) in pacing systems enables reliable detection of ventricular evoked-response (ER) signals for automatic capture verification (AC) in patients with implantable cardioverter-defibrillator (ICD) leads.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- Automatic capture verification (AC) is crucial for ensuring the efficacy of pacing therapy in patients with implantable cardioverter-defibrillators (ICDs).
- Intracardiac ventricular evoked-response (ER) signals offer a potential method for real-time capture assessment.
- Optimizing signal detection from ER signals is essential for reliable AC performance.
Purpose of the Study:
- To investigate the feasibility of using intracardiac ventricular evoked-response (ER) signals for automatic capture verification (AC) in patients with implantable cardioverter-defibrillator (ICD) lead systems.
- To evaluate the impact of reduced coupling capacitance (CC) on ER signal detection for AC.
Main Methods:
- Ventricular ER signals were assessed using an external pacing system with a reduced coupling capacitance (2.2 microF).
- Threshold testing was performed with a 0.4 ms pulse duration, recording pacing markers, surface ECG, and intracardiac electrograms.
- Analysis focused on ER amplitude and the ER-to-afterpotential ratio (SAR), with SAR > 2 indicating successful capture.
Main Results:
- The study included 20 patients (10 acute leads, 10 chronic leads) with ICDs from two manufacturers.
- ER amplitudes were comparable between acute and chronic leads (median 8.1 mV vs. 8.3 mV).
- High SAR values (median 48.0 for acute, 13.2 for chronic) demonstrated successful capture detection in all patients, confirming AC feasibility.
Conclusions:
- Reducing pacing coupling capacitance facilitates adequate ER signal detection for automatic capture verification with various ICD lead systems.
- This approach enables reliable AC, enhancing pacing therapy safety and efficacy.
- Further research is needed to assess the influence of high-voltage shock treatments on ER signal detection.