View clinical trials related to Bradycardia.
Filter by:In case of sinus node dysfunction, it is often necessary to choose the safer option provided by a DDD pacemaker even though the most appropriate mode of pacing is AAI mode. In addition to saving energy, the latter mode allows spontaneous ventricular activation, the haemodynamic consequences of which are, in most cases, better than those obtained with dual chamber pacing. Recent studies as the MOST study suggest also that ventricular desynchronization imposed by right ventricular apical pacing even when AV synchrony is preserved increases the risk of atrial fibrillation in patients with SND. Similar results were already given by anterior studies (PIPAF) which, taking into account the percentage of ventricular pacing, suggested that AF prevention algorithm in combination with a preserved native conduction are efficient in reducing AF burden. However, current practice is to implant a dual chamber pacemaker to prevent the risk of atrioventricular block (AVB) even if DDDR pacing with a fixed long AV delay was found inefficient in reducing ventricular pacing and was associated with a high risk of arrhythmias. The Symphony 2550 cardiac pacemaker offers pacing modes that automatically switch from AAI(R) mode to DDD(R) or DDI(R) in event of severe atrioventricular conduction disorder, irrespective of whether or not these are accompanied by an atrial arrhythmia, returning spontaneously to AAI(R) mode as soon as the spontaneous AV conduction has resumed. These 2 particular modes are called the AAI SafeR and DDD/AMC (R) mode. The main differences between both modes are that (i) AAI SafeR does not trigger any AV Delay after a sensed or paced atrial event which allows long PR intervals or even limited ventricular pauses with no switch to DDD(R), while (ii) DDD/AMC (R) is able to optimize AV Delay after switching to DDD(R) according to measured spontaneous conduction times and to provide an acceleration in case of vaso-vagal syndrome. This pacing mode has previously been assessed in clinical studies. This study intends to demonstrate that the automatic modes switching significantly reduce the percentage of ventricular pacing in patients implanted with a spontaneous AV conduction and reduce the occurrence of atrial arrhythmias, on a mid-term follow-up period, in comparison to standard DDD pacing with long AVDelay.
- Determine the accuracy of the NTX wireless monitoring system alerts - Evaluate patient compliance with wearing device - Determine false alarm rates
- Reduction in time to detection of Clinically Significant events - Reduction of time to Intervention during Clinically Significant events - Reduction in the number of admissions to Intensive Care
Prospective study assessing the incidence of atrial high rate episodes (AHRE) in pacemaker patients with and without previously diagnosed AT.
Unlike phones, which are commonly held to the ear, music is now available via portable MP3 players and they can be held almost anywhere. Thaker et al state that Apple iPods cause pacemaker interference in 50% of their patients, with over-sensing in 20% of patients, telemetry interference in 29% of patients and pacemaker inhibition in 1.2% of patients. The mean age for their sample was 76.1 years +/- 8.6 years. We anticipate that a higher proportion of teenagers and children who have pacemakers use portable MP3 players than in the elderly adult population.We will include the first 100 patients with pacemakers and ICDs who consent for the prospective observational study a single tertiary care center. We intend to conduct a descriptive study, tabulating the number of times that a pacemaker or ICD has changes in the sensing thresholds, pacing thresholds, telemetry interference or pacemaker inhibition when exposed to a series of portable MP3 players at various distances. In addition, we will describe the nature and quantitative differences of those changes.
The purpose of this study is to evaluate the possibility to program the shortest possible Post Ventricular Atrial Blanking Period (PVAB) and high sensitivity without getting inappropriate Mode Switch due to Far Field R-Wave sensing when using the new Tendril 1699T lead. Comparison with Tendril 1688T or 1388T with optimized Post Ventricular Atrial Blanking (PVAB).
Pacing from the right ventricle (as is current practice in patients implanted with permanent pacemakers for bradycardia), has been associated with worse outcomes particularly in heart failure patients. Recent clinical trials suggest that chronic right ventricular pacing (VP) is associated with worsening heart failure, increased strokes and atrial fibrillation. Hemodynamically, right VP results in delayed activation and contraction of the LV which can give rise to functional mitral regurgitation, shortened diastolic filling time and thus reduced coronary filling, as well as abnormal arterial pulsatile flow. The mechanisms for the deleterious effects of right VP in heart failure patients have not been previously investigated. Our aim of this study is therefore to investigate the hemodynamic effects of right VP in stable heart failure patients in terms of exercise cardiac output (CO, an important measure of myocardial function and prognosis), as well as endothelial function which may be deranged as a result of abnormal arterial pulsatile flow.
The purpose of this study is to examine the relationship between receipt of DTaP and the occurrence of prolonged episodes of apnea and bradycardia in preterm infants, while employing a random control study design and an objective assessment of cardiorespiratory events.
The purpose of this clinical study is to confirm safety and efficacy in the clinical magnetic resonance imaging (MRI) environment of the investigational EnRhythm MRI™ SureScan™ Pacing System (used in support of Revo MRI™ SureScan Pacing System launch).
This is a randomized, prospective, single-blinded, multi-center study involving approximately 1500 patients at 100 centers. The purpose of this study is to demonstrate the effectiveness of Closed Loop Stimulation (CLS) rate adaption technology over both standard rate responsive technology (R) and non-rate responsive mode (DDD) during activities of daily living (ADL).