View clinical trials related to Atrial Fibrillation.
Filter by:Atrial fibrillation (AF) often starts with short episodes of rapid irregular heartbeats that are only detected by implanted pacemakers or defibrillators. Usually people don't know that they have these episodes. Over time, these episodes can happen more often and last for longer periods. In some people, the heart eventually remains permanently in a fast irregular rhythm, known as atrial fibrillation. This condition can lead to strokes and blood clots. If physicians could detect atrial fibrillation at a very early stage they could treat people early and possibly prevent the condition from becoming permanent. People with implanted devices allow a unique opportunity to constantly monitor the heart rhythm so investigators can detect any irregularities immediately. Investigators don't know which people are at risk of developing short episodes of fast irregular heartbeats that can lead to atrial fibrillation. The purpose of this study is to find out if there are proteins or chemical changes in the blood that can predict the risk of developing atrial fibrillation. These chemical changes, also known as biomarkers, may also be able to give investigators other clues about atrial fibrillation.
Atrial fibrillation (AF) is the most common cardiac arrhythmias with a constantly growing prevalence. Two main techniques are used today to restore sinus rhythm: electrical cardioversion and radiofrequency ablation. Radiofrequency ablation has become a recognized and effective treatment of AF. Despite a relatively high success rate (about 80%), a substantial number of patients require a second procedure to obtain sinus rhythm. Many publications have led to the study of predictors of failure of this ablation factors (BMI, uncontrolled hypertension, size of the OG...) but to date no parameter is reliable and usable in daily practice. It is the same for electrical cardioversion. Despite a relatively high immediate success rate of approximately 80%, a significant number of patient relapse arrhythmia in short and long term. Many publications have led to the study of predictive factors of failure (seniority and type of AF, uncontrolled hypertension, size of the OG, mitral valve disease...) but so far the results are disappointing. In AF patients with heart disease underlying, it has been well demonstrated that the renin-angiotensin system (RAAS) was strongly activated. In addition, it is now well established that elevated plasma aldosterone as in primary hyperaldosteronism is associated with a significantly increased risk of occurrence of cardiovascular events. The high plasma concentrations were also highlighted in the acute phase of myocardial infarction, or heart failure and are associated with an increase in major cardiovascular event rate, especially arrhythmias. In some experimental models of heart failure, it has been demonstrated a suppression of the occurrence of spontaneous FA by an anti-aldosterone treatment. The arrhythmogenic effect of aldosterone has also been shown in animal models. All these results indicate a potential role of aldosterone in the genesis of an arrhythmogenic substrate and the FA. The hypothesis of this study is that aldosterone plasma levels in pre-reduced patients is predictive of recurrence risk of atrial fibrillation or other supraventricular tachycardias (flutter or atrial tachycardia) after FA reduction, either in using a radiofrequency ablation or via electrical cardioversion.
The aim of this study is to determine the diagnostic yield of continuous 7-day Holter ECG for detecting covert paroxysmal atrial fibrillation in patients with recent embolic stroke or transient ischemic attack (TIA) of undetermined cause after completion of a standard clinical work up including an initial 24-hour Holter monitoring.
Consecutive patients with paroxysmal AFib scheduled to undergo pulmonary vein isolation either with radiofrequency (RF) or cryoballoon will be included. Left atrial appendage emptying flow velocity (LAA-EFV) will be measured with transesophageal echocardiography (TEE) immediately before and following left atrial ablation (1 month post). The change in LAA-EFV will be compared between the two groups (RF versus Cryo).
Atrial fibrillation is a common disease in the aging population that has severe implication if left untreated as it leads to embolic stroke and other embolic phenomenon. Embolic stroke in particular has severe implications to our community as the cost of care for such immobile patients can be extremely high. Atrial fibrillation typically begins as Paroxysmal atrial fibrillation (PAF), which makes early detection extremely difficult as the PAF may only occur transiently in the initial stages. Long term continuous ECG monitoring is currently required over weeks to detect early PAF. Current devices typically need to be implanted (loop recorders) to be sensitive enough to detect infrequent episodes of PAF. New generation ECG remote devices (non-invasive) are however now available that are wearable over long periods and can send data directly to a database for centralized collection and analysis of the data. The aim of this study will be to use such a device to evaluate the incidence of PAF in different population of patients, with each patient wearing and sending continuous ECG data for periods of a week or more to a central database, across several public hospitals in Singapore.
This study is prospective Cohort study which was performed in multicenter (General Hospital) in Korea. Inclusion criteria is all patients with atrial fibrillation who visit hospital. The purpose is to analyze complication, composite outcome (all cause mortality, hospitalization, the incidence of stroke, heart failure and cardiovascular event (MACE)) according to the 1) the use of anti-arrhythmic drugs (AADs), 2) use of medication for rate control (beta blocker, calcium channel blocker and digoxin) and 3) use of anticoagulation agents (warfarin, coumadin, an NOAC)
The aim of the study is to examine the effect of RIPC on physiological parameters in non-valvular paroxysmal atrial fibrillation. Furthermore the study will provide a unique bio-date base for further analysis of molecular and genetic mechanisms responsible for observed results. The potential effect of RIPC on AF inducibility and/or prothrombotic activity might be implemented as additional treatment component to reduce AF burden and minimize thromboembolic risk. Interim Analysis will be done after 73 patients.
Randomized study concerning the effect of the number of risk diagrams (with treatment +/- without treatment), the period of stroke risk estimation (one year or five years) and the target of prescription (the patient with atrial fibrillation or the physician himself, imagining she/he has atrial fibrillation) on the intention to prescribe or not oral anticoagulation.
Atrial fibrillation is a common arrhythmia which requires electrical cardioversion in many patients in order to regain sinus rhythm. In a previous retrospective study a complication of acute renal failure was found in 17% of the patients after cardioversion.(The incidence and prognosis of renal dysfunction following cardioversion of atrial fibrillation. Helman Y,...Gilon D et al:Cardiology 2013;124(3);184-9.) Another complication previously described after cardioversion is pulmonary edema. In this prospective study the investigators aim to evaluate the risk of acute renal failure post cardioversion. In addition the investigators would like to evaluate hemodynamic changes, fluid balance and sodium levels in patients post cardioversion as a potential mechanism for both acute renal failure and pulmonary edema post cardioversion. In order to assess hemodynamic changes the investigators will use a non-invasive FDA approved device called NICaS (Non-Invasive Cardiac System). This system calculates cardiac output, cardiac index and peripheral vascular resistance in a non-invasive, fast and accurate way.
The aim of the present prospective study is to further develop and validate a composite risk score predicting both ischemic and bleeding risk, based on epidemiologic, clinical, biological, and/or morphologic complementary data. First, the investigators will assess the predictive performance of current clinical risk scores. Second, the investigators will assess the potential predictive value of additional markers. Third, the investigators will aim to develop a new risk score.