Automatic assessment of atrial pacing threshold in current medical practice.

Aims: The aim of this study was to validate the ambulatory automatic atrial threshold monitoring algorithm by comparing the measurements assessed by the automatic system and those evaluated manually by the physician at discharge, 2- and 8-month follow-up sessions.

Methods And Results: This is an observational multicentric prospective study of 352 patients implanted with EnPulse(®) DR pacemakers. Mean age was 76.

Effect of a pacing mode preserving spontaneous AV conduction on ventricular pacing burden and atrial arrhythmias.

Background: Using dual-chamber pacemakers with new algorithms: Manage Ventricular Pacing (MVP™), minimizes unnecessary ventricular pacing (VP). This function operates in AAI/R mode with backup VP during AV block.

Aim: The aim of "Generation MVP" study was to assess the VP burden and atrial arrhythmias (AA) burden according to indication of pacing and MVP™ function programming of AdaptaDR implantable pacemaker (Medtronic Inc.

Atrioventricular nodal reentrant tachycardia diagnosed by pacemaker electrograms.

Electrograms stored by pacemakers or implantable defibrillators enable the diagnosis of numerous atrial or ventricular arrhythmia episodes. We present the case of a patient implanted with a DDD pacemaker for sinus node dysfunction who experienced episodes of tachycardia. Atrioventricular nodal reentrant tachycardia was diagnosed by real-time analysis of electrograms during and at the onset of the tachycardia episodes.

Cardiac resynchronization therapy using a VDD lead.

In heart failure patients with normal sinus node function, cardiac resynchronization therapy can be achieved with only two leads, one VDD type, and one left ventricular. This reduces the number of venous punctures, implanted leads, and possibly operation and fluoroscopic times and complication rates. We present two cases and discuss the advantages and limits of such a procedure.

Cross-ventricular pacemaker-mediated tachycardia by myopotential induction during biventricular pacing.

Background: Patients in permanent atrial fibrillation treated for heart failure and ventricular asynchrony can be implanted with conventional dual chamber pacemakers (DDD) pacemakers used in the biventricular mode. The left ventricular lead is connected to the atrial channel.

Case Report: We report the case of a patient who developed ventriculo-ventricular pacemaker-mediated tachycardia (PMT) induced by myopotential sensing in the atrial channel, inhibiting left ventricular pacing.