Active clinical trials for "Atrial Fibrillation"

MIGAT will develop and transfer software tools to assist ablation therapy of cardiac arrhythmias. The scientific background and objectives of MIGAT differ between atrial and ventricular arrhythmias, because the knowledge on structure-function relationships and the definition of ablation targets are different. Hypothesis: The combination of body surface mapping and imaging will enable a comprehensive non-invasive assessment of cardiac arrhythmia mechanisms and localization, myocardial structural substrate, and cardiac anatomy, all of which should be of value to better define targets for ablation therapy. No software solution is currently available for multimodal data processing, fusion, and integration in 3-dimensional mapping systems to assist ablation. Because such a development requires a trans-disciplinary approach (cardiac electrophysiology, imaging, computer sciences), it is likely to emerge from an academic initiative. Objectives: MIGAT will gather resources from the Liryc Institute (L'Institut de Rythmologie et Modélisation Cardiaque), the Inria (Institut National de Recherche en Informatique et en Automatique) and the University Hospital of Bordeaux to develop a computer-based solution with high expected impact on the daily management of cardiac electrical disorders. The research program will benefit from the MUSIC (Magnetom Avanto, Siemens, Erlangen, Germany) equipment recently funded as part of the "Investissement d'Avenir" program, and combining state-of-the-art electrophysiology and magnetic resonance imaging technology. MIGAT will involve software engineers, computer science researchers, cardiologists, radiologists and clinical research personnel with the following objectives: Development of a multimodal data processing software to assist cardiac ablation Optimization and Validation of the software in terms of user experience Optimization and Validation of the software in terms of clinical performance Optimization of software quality compatible with subsequent device certification and randomized-controlled evaluation

The aim of this work is to study the prevalence of T-tubular system in left and right myocytes from patients in sinus rhythm and whether this is altered in paroxysmal and permanent atrial fibrillation. Furthermore, since current information is lacking on the key Ca2+-handling proteins RyR, NCX, and SERCA-2a from patients in Atrial Fibrillation (AF), it will be investigated whether a regulation of these proteins could be an underlying cause of the disease. Mitochondrial function will also studied. The investigators hypothesize that both structure of sarcolemma and localization of key Ca2+-handling proteins are altered in patients with atrial fibrillation compared with patients in sinus rhythm. The investigators hypothesize that mitochondrial function is altered in patients with atrial fibrillation compared with patients in sinus rhythm.

Atrial fibrillation (AF) is the most common clinical arrhythmia. AF is associated with increased risk for stroke due to blood clots formed in the fibrillating atria. Some patient characteristics increase the likelyhood of AF and at the same time the risk of stroke when AF has developed. To reduce the risk of stroke, anticoagulation therapy is recommended in patients with AF and risk factors (such as high blood pressure, diabetes, vessel disease). However, occasional (paroxysmal) AF may occur without symptoms and remain undetected, leaving patients at risk. Aim of the prospective randomized study is to compare two management strategies for patients at increased risk for AF but without a known history of AF. Patients are seen regularly (monthly, then quarterly) for follow-up (incl. ECG recording and blood sample). One group of patients additionally receives a subcutaneous implantation of a loop recorder for continuous rhythm monitoring, while the control group remains on standard follow-up. Observation period is one year (optional extension for 3 years). The time to first diagnosis of AF is compared between groups, blood samples are analyzed for potential biomarkers of AF.

The aim of this study is to determine the yield of 3 weeks outpatient mobile cardiac monitoring for detection of atrial fibrillation in patients with history of stroke of known cause.

The purpose of this study is to gather information about the size and shape of patients' hearts in order to design a device.

This is a multi-center study designed to evaluate the accuracy and precision of the INRatio® Prothrombin Time (PT) Monitoring System, utilizing the INRatio test strip newly designed for low sample volume and heparin insensitivity, when used by trained medical professionals for the quantitative determination of PT and International Normalized Ratio (INR) in fingerstick and venous whole blood from subjects on oral anticoagulation therapy (OAT). These results will be compared to those PT/INR results obtained on plasma from the same subjects as analyzed at a central laboratory with the Sysmex CA-560 System.

Prospective study assessing the incidence of atrial high rate episodes (AHRE) in pacemaker patients with and without previously diagnosed AT.

A form of irregular heart rate called, Atrial Fibrillation (AF) is a major clinical problem. It afflicts about 2 million Americans and is the single largest heart related cause of stroke. However, despite 120 years of speculation and research, the mechanisms that cause AF are poorly understood. Acute AF is also the most common irregular heart rate after open-heart surgery in patients. This is seen in as many as 30% of such patients and often results in a longer hospital stay. In this study we would like to study the pattern of atrial fibrosis (scar tissue in the heart) and an associated blood marker (a protein called pro-collagen-1) in those patients concurrently having open heart surgery.

We aimed to demonstrate the impact of left atrial functions which were evaluated by three different echocardiographic modalities , on postoperative atrial fibrillation.

The role of plasma NT-proBNP, hsCRP, TIMP-1(Tissue inhibitors of MetalloProteinase-1),TGF-b, MMP-3(Matrix MetalloProteinase-3), and pro-MMP-1 in predicting the recurrence of AF after surgical Maze procedure. The association of expression of CTGF, TGF-b, BNP, ANP, collagen-1, and collagen-3 in LA with the recurrence of AF after surgical Maze procedure.