Active clinical trials for "Bundle-Branch Block"

The aim of this study is to examine a correction term for an adapted QT interval during ventricular pacing (right, left and biventricular pacing) to obtain valid formulae correcting for the QT intervals in various pacing conditions.

This study is a single-arm, prospective, multi-center study to assess clinical performance of the SHERLOCK 3CG™ Diamond Tip Confirmation System (TCS) with MODUS II software for confirming correct tip position of peripherally inserted central catheters (PICCs) in adult subjects with altered cardiac rhythm.

This is a single center, non-randomized, unblinded study of patients who are followed at Essentia Health - St. Mary's Medical Center and who are referred for a clinically indicated diagnostic electrophysiology (EP) study with or without ablation. During the procedure, events of atrial fibrillation, sinus rhythm and bundle branch block that may occur during the course of the case will be saved electronically and analyzed offline. The stored data will be evaluated off-line for changes in activation timing of the near and far field ventricular signals of the stored events. This proof-of-concept study will attempt to assess whether atrial fibrillation, or bundle branch block can change activation timing compared to baseline sinus rhythm. If no significant activation change is seen, then this finding can be used as a basis to distinguish ventricular tachycardia from atrial fibrillation in future rhythm discrimination methods.

The replacement of the aortic valve by percutaneous approach (called TAVI) is a therapy which is booming in the management of aortic stenosis. It concerns patients who have a high surgical risk presenting comorbidity, for whom a classic approach by surgery of valvular replacement seems unreasonable. Beyond its feasibility, the implantation of a TAVI is less invasive and improves the patient's morbi-mortality. The appearance of a Left Bundle Branch Block (LBBB) is one of the most frequent complications of this procedure and represents an important risk of atrio-ventricular (AV) high grade conductive disorders requiring permanent pacing in 5 in 15 % of the cases in 1 year. De novo LBBB is associated with a more important morbi-mortality in post-TAVI situation. However, there are no predictive elements of these conductive disorders. Besides, the incidence and the deadline of appearance of this AV disorders are not established. It seems relevant to propose a new stratification based on ECG and endocavitary data. The monitoring of the conductive disorders is allowed by remote monitoring thanks to the implantation of a pacemaker or an implantable holter allowing to determine the incidence and the deadline of appearance of high grade AV conduction disorders.

This pilot study is designed as a multi-centre cohort study determining the degree of LV reverse remodeling in patients with intermediate QRS widths (120-149ms) who undergo CRT implant with transseptal LV leads, and comparing to the average expected reverse remodeling rate in patients with standard transvenous coronary sinus leads and QRS widths ≥150ms.

There are patient related risk factors for PPI that can be identified and assessed in retrospective pooling of 1000+ TAVI patient datasets. Retrospective pooling of 6 datasets already available at participating centres (4 sites in Germany, 1 in Zwolle / The Netherlands, 1 in Linköping / Sweden). Additional assessment of calcifications using a CT data core lab. Statistical analysis of the obtained dataset with respect to the objectives of the registry.

A left bundle branch block (LBBB) is related to abnormal cardiac conduction and mechanical asynchrony and is associated with hypertension and coronary artery disease. Improved evaluation of left ventricular (LV) mechanical asynchrony is needed, because of the increasing number of patients with a LBBB and heart failure. A variety of patterns of mechanical activation can be observed in LBBB patients. Novel imaging modalities such as tissue Doppler imaging, real-time 3D echocardiography and cardiovascular magnetic resonance imaging provide information about regional and global LV function in healthy subjects, patients without a LBBB with heart failure, patients with a LBBB without heart failure, and patients with a LBBB with heart failure. The investigators want to evaluate the different patient groups with the novel imaging modalities and they want to compare the novel imaging modalities with each other. The investigators hypothesized that, between the groups, differences concerning regional and global LV function are measurable. Each novel imaging technique has its own advantages and limitations but are comparable in measuring regional and global LV function.

This study aimed to evaluate incidence, prognosis and predictive factors of new-onset of persistent left bundle branch block (LBBB) after rapid-deployment aortic valve replacement (RD-AVR) with the IntuityTM bioprosthesis. It was an observational, retrospective and single-center study. Two hundred and seventy-four consecutive patients without any baseline ventricular conduction disorder or previous permanent pacemaker or defibrillator implantation who underwent RD-AVR with the IntuityTM valve were included. Twelve-lead electrocardiogram and transthoracic echocardiography were performed preoperatively, postoperatively, at discharge, 1-month, and 1-year. Incidence, prognosis and predictive factors of new-onset of persistent LBBB were evaluated.

The purpose of this study is to assess the incidence (at 90-days) of ventricular pacing in patients undergoing permanent pacemaker placement after TAVR. As well as incidence (at 90-days) of atrioventricular block (AVB), intraventricular conduction delay (IVCD), bundle branch block (BBB), and rate histogram in patients undergoing permanent pacemaker placement after TAVR.

Consecutive patients with high grade aortic stenosis undergoing transcatheter aortic valve replacement (TAVR) with a self-expanding valve (Medtronic CoreValve Evolut R® or Edwards Sapien S3®) without pre-existing pacemaker devices are eligible for inclusion. During the TAVR procedure, an electrophysiologic study including measurements of infranodal conduction times (HV-interval before and after valve implantation) will be performed. Electrocardiograms before TAVR, before discharge, after 30 days and after 12 months will be analyzed regarding new onset LBB and the occurrence of high-degree AV block (HAVB) .