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[Prevention of atrial arrhythmias by pacing]
1Klinik für Innere Medizin-Kardiologie, Philipps-Universität Marburg. funck@mailer.uni-marburg.de
Insights
Pacemakers with specialized algorithms can help manage atrial fibrillation by preventing episodes and reducing arrhythmic burden. These pacing strategies offer new therapeutic options for atrial arrhythmias.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Atrial fibrillation is a common arrhythmia impairing quality of life and increasing morbidity and mortality.
- Thromboembolic complications associated with atrial fibrillation contribute significantly to healthcare costs.
Purpose of the Study:
- To review pacing principles in managing atrial arrhythmias.
- To explore novel preventive and therapeutic pacing strategies for atrial fibrillation.
Main Methods:
- Overview of pacing algorithms for atrial fibrillation prevention, including overdrive pacing and specialized modes like "suppression of premature atrial contractions."
- Discussion of advanced pacing configurations such as dual-site right atrial or biatrial pacing.
- Examination of antitachycardia pacing (ATP) for active treatment of atrial tachyarrhythmias.
Main Results:
- Pacing algorithms show potential in reducing atrial arrhythmic burden.
- Antitachycardia pacing (ATP) has demonstrated immediate termination of approximately two-thirds of diagnosed atrial tachyarrhythmias.
- Specialized pacing strategies address key atrial fibrillation onset mechanisms.
Conclusions:
- Pacing strategies, including novel algorithms and configurations, offer promising approaches for managing atrial fibrillation.
- Further analysis of ongoing clinical trials is necessary to establish the definitive clinical relevance of these pacing interventions.
- Preventive pacing aims to delay or prevent the progression of paroxysmal and intermittent atrial fibrillation to chronic forms.
Background:
Atrial fibrillation is the most frequent arrhythmia. It can impair quality of life considerably. Due to thromboembolic complications it contributes to the patients' morbidity and mortality and to the costs for their medical treatment.
Prevention:
In chronic atrial fibrillation there is a need for adequate anticoagulation and heart rate control. In paroxysmal and intermittent atrial fibrillation it should be sought to prevent its progression to chronic atrial fibrillation. Since atrial fibrillation initiates negative processes of remodeling within the atrial myocardium, it has the tendency to perpetuate itself. From a theoretical point of view, it can be expected that all means which prevent episodes of atrial fibrillation or which terminate it immediately after its onset, are able to prevent or at least to delay the progression to chronic atrial fibrillation. Pharmacologic treatment is usually used to prevent recurrences of atrial fibrillation. Based on the actual data it can also be expected that pacemakers with special preventive pacing algorithms are able to reduce the atrial arrhythmic burden. Besides consequent overdrive pacing, more sophisticated algorithms like "suppression of premature atrial contractions", "post exercise response", "automatic rest rate" or "post mode-switch pacing" have been developed. They can be applied either alone or in combination with special lead positions (interatrial septal pacing or pacing of the triangle of Koch) or special stimulation configurations like dual site right atrial pacing or biatrial pacing. These pacing strategies cover the most relevant onset mechanisms of atrial fibrillation. Furthermore, there are algorithms to treat atrial tachyarrhythmias actively by antitachycardia pacing (ATP). First clinical results have shown that about 2/3 of the diagnosed atrial tachyarrhythmias could be terminated by these means immediately after their onset.
Ongoing Trials:
This article gives an overview over the principles of pacing in the management of atrial arrhythmias and ongoing clinical trials in this field. Before a definite judgement on the clinical relevance of these new preventive and therapeutic pacing strategies can be given, the results of these ongoing controlled clinical studies have to be analyzed.