View clinical trials related to Sick Sinus Syndrome.
Filter by:Optimal pacing strategy for patients with SND is still unknown, although several publications in the past years demonstrated a deleterious effect of ventricular pacing. However, pacing has always been apical in these trials, and to which extent this absence of pacing is beneficial for patients with very long PR intervals is still to be found. The aim of this study is to compare ventricular septal pacing to no pacing in patients with SND.
This study aims to determine whether increasing atrial base rate pacing to achieve at least 75-80% atrial pacing in patients with sick sinus syndrome undergoing the implementation of dual-chamber pacemaker can be useful to prevent or decrease the atrial fibrillation during 6 months follow-up duration.
This is a pilot study into the effects on heart function when pacing the right ventricle (RV). This study aims to enrol a population who are clinically indicated to receive a pacemaker. When normal conduction within the heart fails, the treatment may be to implant a permanent pacemaker. Pacing involves passing a lead via a vein to the heart and using an electrical impulse to stimulate a beat. Increasingly the available evidence suggests that long term RV pacing is associated with complications - left ventricule (LV) dysfunction, heart failure, atrial fibrillation (AF) and death in some patients. What we do not see are a large proportion of all patients who receive pacemakers suffering pacing related adverse effects. If there could be a way of identifying those patients in the group who go on to develop pacing induced cardiomyopathy at the time of initial pacing implant, this would be a very valuable clinical measure. These patients could be identified from the outset and paced with a biventricular device to avoid the pacing induced cardiomyopathy. Whilst much energy has been directed towards the LV as a focus of the clinical markers of disease, little has been published looking at RV haemodynamics. We plan to study a cohort of patients who are clinically indicated to receive a pacemaker and study their RV in detail at the time of implantation. We will use conductance catheters and echocardiography to determine measures of pumping function. We will then follow them up for a period of six month using echocardiography and blood markers of heart dysfunction. In those patients who have a reduction in heart function we will then look for common patterns within their initial measurements.
This is a randomized, prospective clinical trial to determine the effects of two different pacemaker atrioventricular delay (AV delay) settings on heart function in patients with dual chamber pacemakers implanted for symptomatic bradycardia with long PR intervals (delayed conduction between upper and lower chambers of the heart). The study will compare a long, fixed AV delay (standard) with an optimized AV delay for each individual using echocardiography (experimental).
Atrial fibrillation (AF) is prevalent in patients with sick sinus syndrome (SSS) and associated with an increased risk of stroke and death. Within the first two years after pacemaker implantation almost half of the patients are diagnosed with AF. Studies have indicated that an increased amount of stimulation from the pacemaker in the atria is associated with an increased amount of AF. The aim of the present study is to test the hypothesis that a reduction of stimulation from the pacemaker in the atria, and reducing the minimal heart rate, increases the time to AF.
Providing ideal rate response to patients should improve their quality of life and ability to execute activities of daily living. Medtronic pacemakers provide rate response pacing by utilizing dual zone programming to specify an "activities of daily living" (ADL) response rate and an "exertion" response rate. There is much data to support the target heart rate for an exercise response but the data to support the programming of the ADL rate is lacking.
Unnecessary right ventricular pacing has been shown to be detrimental in recipients of implantable pacemaker or defibrillators. The ADVANTAGE study evaluates the efficacy of two pacemaker based algorithms (atrioventricular hysteresis function versus mode switch to atrial pacing) to reduce right ventricular pacing.
The objective of the SAMURAI Clinical Study is to collect data to confirm the safety, performance and effectiveness of the ImageReady System for use in the Magnetic Resonance Imaging (MRI) environment when used in accordance with the Conditions of Use included in the Boston Scientific MRI Technical Guide
The objective of this study is to gather data to establish the safety, performance and effectiveness of the INGEVITY pace/ sense leads.
Registry to Improve the Adoption of Consensus Treatment Guidelines (IMPROVE Brady)