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Clinical experience with antitachycardia pacing and improved detection algorithms in a new implantable
D Wietholt1, M Block, F Isbruch
1Hospital of the Westfälische-Wilhelms University of Münster, Department of Cardiology and Angiology, Germany.
Insights
Antitachycardia pacing effectively terminated 91% of stable ventricular tachycardias in patients with implantable cardioverter-defibrillators. Additional algorithms helped prevent inappropriate device discharges, enhancing patient safety.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Implantable cardioverter-defibrillators (ICDs) are crucial for managing life-threatening arrhythmias.
- Optimizing antitachycardia pacing (ATP) modes and detection algorithms is essential for effective ICD therapy.
- Third-generation ICDs offer advanced features for arrhythmia management.
Purpose of the Study:
- To evaluate the efficacy of ATP modes in terminating ventricular tachycardias (VTs).
- To assess the performance of detection algorithms in preventing inappropriate ICD shocks.
- To determine the overall effectiveness of a new generation ICD in arrhythmia control.
Main Methods:
- A prospective study involving 42 patients with various cardiac conditions receiving a third-generation ICD.
- Postoperative programming of ATP modes (burst and ramp) with specific parameters.
- Electrophysiologic studies to guide programming and assess outcomes.
Main Results:
- Antitachycardia pacing successfully terminated 91% of hemodynamically stable ventricular tachycardias.
- Seven percent of VT episodes accelerated during ATP, but without syncope.
- Additional detection algorithms significantly reduced inappropriate shocks in patients with supraventricular tachycardias.
Conclusions:
- Antitachycardia pacing in third-generation ICDs is highly effective for terminating stable ventricular tachycardias.
- Combined use of ATP and advanced detection algorithms improves ICD safety by preventing inappropriate shocks.
- This technology enhances the therapeutic benefit of ICDs in arrhythmia management.
Objectives:
This study was conducted to assess the effectiveness of antitachycardia pacing modes and detection algorithms in patients with a new third-generation implantable cardioverter-defibrillator.
Methods:
Twenty-three of 42 consecutive patients had coronary artery disease, 14 had dilated cardiomyopathy, 2 had prior valve replacement and 3 had arrhythmogenic right ventricular dysplasia. The mean ejection fraction was 41 +/- 14%; there were 31 men (74%) and 11 women, with a mean age of 53 years. On the basis of preoperative and postoperative electrophysiologic studies, in 28 patients antitachycardia pacing was postoperatively programmed randomly as "burst" (66%) or autodecremental "ramp" (34%) stimulation with a first coupling interval of 81% of tachycardia cycle length and up to 8 sequences with 3 to 10 stimuli.
Results:
During a follow-up interval of 6.3 +/- 2.2 months, 15 patients were treated by antitachycardia pacing for a median of 6 (range 1 to 59) hemodynamically stable ventricular tachycardias (175 +/- 12 beats/min). In 5 patients, 22 ventricular tachycardias (9%) were not terminated by antitachycardia pacing but by cardioversion. Seven (3%) of these episodes accelerated (> 50 ms) during antitachycardia pacing. Syncope did not occur during these episodes. In seven patients initial antitachycardia pacing in cases of supraventricular tachycardias delayed charging and redetection prevented inappropriate discharges. Additional detection algorithms were programmed only after inappropriate therapy. The sudden "onset" and "sustained rate duration" criteria were programmed in three patients and the cycle length "stability" criteria in six patients, respectively. After activation of these detection algorithms only two of the seven patients had further inappropriate device discharges.
Conclusions:
Thus, antitachycardia pacing by this implantable cardioverter-defibrillator effectively and appropriately terminated 91% of hemodynamically stable ventricular tachycardias. Inappropriate device discharges were prevented in some patients by antitachycardia pacing and additional detection algorithms.