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[New indications for cardiac pacing]
1Service de cardiologie B, hôpital Arnaud-de-Villeneuve, CHU de Montpellier.
Insights
Cardiac pacing offers new therapeutic avenues beyond bradycardia, including hypertrophic cardiomyopathy and dilated cardiomyopathy. Optimal lead placement and pacemaker settings are crucial for patient outcomes, though long-term effects remain under investigation.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Context:
- Cardiac pacing is expanding beyond symptomatic bradycardia treatment.
- New indications focus on hemodynamic and antiarrhythmic benefits.
- Obstructive hypertrophic cardiomyopathy is a well-documented, though rare, indication.
Purpose:
- To explore novel applications of cardiac pacing.
- To evaluate the efficacy and optimal parameters for pacing in specific cardiomyopathies and arrhythmias.
- To assess the role of pacing in hypertrophic and dilated cardiomyopathies and atrial tachycardias.
Summary:
- Cardiac pacing is increasingly used for obstructive hypertrophic cardiomyopathy, even without prior hemodynamic testing, showing myocardial remodeling benefits.
- Pacing in dilated cardiomyopathy yields contradictory results, with potential benefits in selected cases with left bundle branch block and long PR intervals.
- Atrial tachycardias and inter-atrial block are being addressed with specialized pacing algorithms and bi-atrial stimulation, respectively, though technical challenges persist.
Impact:
- Pacing may induce beneficial myocardial remodeling in hypertrophic cardiomyopathy.
- Optimizing pacing catheter position and pacemaker settings is critical for efficacy.
- Further research is needed to understand the long-term effects of these advanced pacing strategies on patient longevity.
Abstract:
New indications have recently appeared for cardiac pacing with haemodynamic and antiarrhythmic objectives without any symptomatic bradycardia. The best documented indication, though relatively rare, is stimulation of obstructive hypertrophic cardiomyopathy; initially reserved for cases with favorable results of an acute haemodynamic test, it is now used in other cases without this criterion; hypertrophic cardiomyopathy without permanent obstruction, atrial fibrillation or left bundle branch block. The improvement observed during follow-up is always greater as a real remodeling of the myocardium seems to occur with ventricular dilatation and/or septal thinning. However, the position of the atrial, and above all, of the ventricular pacing catheters is critical as is regulation of the pacemaker which should allow complete ventricular capture with an AV delay allowing good filling. The follow-up of these patients must therefore be regular and the effects on longevity are unknown. DDD pacing has also been proposed in dilated cardiomyopathy. The results are contradictory and only very selected cases with left bundle branch block and long PR interval seem justified with, again, optimisation of the pacing sites with high septal or biventricular stimulation. Recurrent atrial tachycardia, special algorithms preventing extrasystoles have been tried with variable results. In cases with inter-atrial block, atrial resynchronisation by bi-atrial stimulation has been assessed with promising results but many technical problems remain unsolved.