Search Results
Results 301 - 350 of 1513
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Tao Hailong - - 2008
BACKGROUND: Early recurrence of atrial fibrillation (ERAF) after catheter ablation is common and has been thoroughly studied. However, very late recurrence of atrial fibrillation (VLRAF) is rarely researched, and its characteristics have not been determined. HYPOTHESIS: The aim of this study was to investigate the clinical characteristics of VLRAF after ...
Poçi Dritan - - 2008
BACKGROUND: The heart is susceptible to recurrence of atrial fibrillation (AF) during the period immediately following conversion to sinus rhythm (SR). It is less clear whether various onset or trigger mechanisms can predict AF recurrence after direct current (DC) cardioversion of persistent AF. METHODS: In this study, 172 patients (117 ...
Dogan A - - 2008
AIM: The aim of this study was to investigate whether conversion type of atrial fibrillation (AF) to sinus rhythm affects the P wave dispersion (PD) in patients with AF. METHODS: Based on conversion type, 95 consecutive patients with AF<3 months were divided into 3 groups: spontaneous cardioversion (SC) (N.=33, mean ...
Schweitzer P - - 2008
Obstructive sleep apnea syndrome (OSA) is associated with different types of cardiac arrhythmias. The original studies, concentrated mostly on nocturnal brady- and tachyarrhythmias. More recent studies documented high prevalence of atrial fibrillation (AF) and its association with obesity and other risk factors for AF. In addition, continuous positive airway pressure ...
Ziabakhsh-Tabari Shervin - - 2008
OBJECTIVE: To examine the relationship between proinflammatory cytokines, such as interleukin-6 (IL-6) and C-reactive protein (CRP) and atrial fibrillation after on-pump coronary artery bypass grafting (CABG). METHODS: Fifty-four patients with coronary artery disease undergoing elective CABG at the Mazandaran Medical University, Mazandaran, Iran were enrolled in our prospective study in ...
Goto Shinya - - 2008
BACKGROUND: Atrial fibrillation (AF) is a major risk factor (RF) for ischemic stroke. Its prevalence and prognostic impact in patients with atherothrombosis are unclear. METHODS: Risk factors, drug usage, and 1-year cardiovascular (CV) outcomes (CV death, myocardial infarction [MI], and stroke) were compared in AF and non-AF patients from the ...
Lopes Renato D - - 2008
Atrial fibrillation (AF) is the most common cardiac arrhythmia in clinical practice, accounting for approximately one-third of hospitalizations for cardiac rhythm disturbances. The highest incidence of AF is in patients 70-80 years old and other high-risk populations. Although the diagnosis of AF is usually straightforward, effective treatment strategies are less ...
Cho Goo-Yeong - - 2009
BACKGROUND: The clinical and echocardiographic parameters associated with the risk of developing new onset atrial fibrillation (AF) in congestive heart failure (CHF) have not been studied comprehensively. We determined if dyssynchronous left atrial (LA) lengthening and contraction predicted future development of new onset AF in patients with CHF. METHODS: One ...
Hammer Sebastiaan - - 2008
OBJECTIVES: This study sought to assess the effects of prolonged caloric restriction in obese patients with type 2 diabetes mellitus (T2DM) on myocardial triglyceride (TG) content and myocardial function. BACKGROUND: Myocardial TG content is increased in patients with T2DM and may reflect altered myocardial function. It is unknown whether myocardial ...
Pariaut R - - 2008
BACKGROUND: Lidocaine is most frequently used to treat ventricular arrhythmias. However, lidocaine may have an antiarrhythmic effect for certain supraventricular arrhythmias. HYPOTHESIS: We hypothesized that lidocaine would be effective in converting experimentally induced atrial fibrillation (AF) to sinus rhythm and that a decrease in the dominant frequency (DF) and an ...
Burashnikov Alexander - - 2008
Although amiodarone is one of the most effective pharmacologic agents used in clinical management of atrial fibrillation (AF), little is known about its differential effects in atrial and ventricular myocardium. This study sought to compare the electrophysiological effects of chronic amiodarone in atria and ventricles. We compared the electrophysiological characteristics ...
Hof Irene - - 2008
The success of catheter ablation of atrial fibrillation (AF) is highly dependent on a preprocedural assessment of the size and shape of the left atrium. The most precise method to determine left atrial (LA) volume using computed tomography requires manually tracing the LA area of each cross-sectional image. This is ...
Matsutani Noriyuki - - 2008
Atrial fibrillation (AF) is the main cause of morbidity among patients over 40 years of age with atrial septal defect (ASD). The closure of ASD in older patients does not decrease the occurrence of AF.(1-3) However, percutaneous ASD closure devices eliminate the possibility of a transseptal approach for future catheter-based ...
Kuwahara Taishi - - 2009
INTRODUCTION: Catheter ablation on the left atrial posterior wall has been reported to potentially damage the esophagus or periesophageal vagal nerve. The aim of this study was to evaluate the efficacy of esophageal temperature monitoring (ETM) in preventing esophageal or periesophageal vagal nerve injury in patients with atrial fibrillation (AF) ...
Scherr Daniel - - 2009
BACKGROUND: Complex fractionated atrial electrograms (CFAEs) have been reported as targets for catheter ablation of atrial fibrillation (AF). However, the temporal stability of CFAE sites remains poorly defined. METHODS AND RESULTS: The study consisted of two phases. In the initial phase, two automated software algorithms, namely the interval confidence level ...
Finsterer J - - 2008
Atrial fibrillation (AF) is the most common type of cardiac rhythm abnormality in adults, affecting 1 to 1.5% of the general population in the Western world and is the major risk factor for stroke with a fivefold risk compared with the general population. Pharmacological and nonpharmacological strategies are available for ...
Głuszak Andrzej - - 2008
BACKGROUND: Atrial fibrillation (AF) is the most common arrhythmia encountered in clinical practice. The natural history of AF tends to begin with short paroxysms which gradually evolve into longer episodes, frequently treatment-resistant, and finally take a permanent form. It is a polyaetiological condition and single paroxysms may be caused by ...
Rahmanian Parwis B - - 2008
BACKGROUND: Simplifications of the Cox-Maze procedure to treat atrial fibrillation (AF) include epicardial pulmonary vein (PV) isolation using various sources to create lines of conduction block. The creation of transmural lesions has been a concern. The heat-sink effect caused by blood flow has limited the effectiveness of unipolar radiofrequency and ...
Govindan Malini - - 2008
Atrial fibrillation (AF) is one of the most common cardiac arrhythmias, and its prevalence continues to rise as the aged population increases. Comparative studies of rhythm control and rate control have been equivocal; however, the benefits of rhythm control may have been offset by the limitations of antiarrhythmic drugs. More ...
Yanulis George E - - 2008
PURPOSE: Recent studies have demonstrated that ventricular rate control is a viable treatment strategy for patients in atrial fibrillation (AF). The purpose of this study was to determine whether or not the benefits of coupled pacing (ie, a proposed rate control therapy) could be used during persistent AF. DESCRIPTION: Six ...
Aronow Wilbert S - - 2008
Atrial fibrillation (AF) is often complicated by a life-threatening ventricular response, and emergency electrocardioversion and/or drug therapy to reduce the rapid ventricular rate may be necessary. However, patients with AF and Wolff-Parkinson-White syndrome should not be given digoxin or calcium channel blockers. Elective direct current (DC) cardioversion has a higher ...
Lopez Violeta - - 2008
AIMS AND OBJECTIVES: The aim of this study was to translate from English and evaluate the validity, reliability and cultural relevance of the Cardiovascular Limitations and Symptoms Profile (CLASP) as a health-related quality-of-life (HRQL) measure in Chinese patients with coronary heart disease. BACKGROUND: Improvement in HRQL is increasingly used as ...
Wachtell Kristian - - 2008
The Losartan Intervention For Endpoint reduction in hypertension (LIFE) study provided extensive data on predisposing factors, consequences, and prevention of atrial fibrillation (AF) in patients with hypertension and left ventricular (LV) hypertrophy. Randomized losartan-based treatment was superior to atenolol-based treatment for reducing new-onset AF and complications, especially stroke, associated with ...
Salzberg Sacha P - - 2008
OBJECTIVE: Management of the left atrial appendage (LAA) is considered an important adjunct to ablation in cardiac surgical patients with atrial fibrillation (AF). However, current surgical techniques, both cut-and-sew and stapling, have been associated with incomplete LAA occlusion and complications. Using cardiac magnetic resonance imaging (MRI), we studied the safety ...
Oliveira Mario M Cardiology Department, Santa Marta Hospital, Lisbon, - - 2009
The impact of atrial dispersion of refractoriness (Disp_A) in the inducibility and maintenance of atrial fibrillation (AF) has not been fully resolved. To study the Disp_A and the vulnerability (A_Vuln) for the induction of self-limited (<60 s) and sustained episodes of AF. Forty-seven patients with paroxysmal AF (PAF): 29 patients ...
Glover Benedict M - - 2008
BACKGROUND: The optimal waveform tilt for defibrillation is not known. Most modern defibrillators used for the cardioversion of atrial fibrillation (AF) employ high-tilt, capacitor-based biphasic waveforms. METHODS: We have developed a low-tilt biphasic waveform for defibrillation. This low-tilt waveform was compared with a conventional waveform of equivalent duration and voltage ...
Jovin Angelika - - 2008
Atrial fibrillation (AF) is present in 30-40% of patients presenting for mitral valve surgery. In patients undergoing mitral valve repair, the presence of AF may be associated with increased mortality and morbidity and this is also the case in patients in whom AF persists postoperatively. Advances in understanding the pathogenesis ...
Klos Matthew - - 2008
The posterior left atrium (PLA) and pulmonary veins (PVs) have been shown to be critical for atrial fibrillation (AF) initiation. However, the detailed mechanisms of reentry and AF initiation by PV impulses are poorly understood. We hypothesized that PV impulses trigger reentry and AF by undergoing wavebreaks as a result ...
Katritsis Demosthenes - - 2008
INTRODUCTION: Heterogeneities in electrophysiological properties may contribute to the development of atrial fibrillation, and regional disparities in endocardial voltage in the left atrium have been related to arrhythmogenic mechanisms. This study aimed at investigating endocardial voltage in different regions of the left atrium in patients with atrial fibrillation (AF). METHODS ...
Ravens Ursula - - 2008
Abnormal excitability of myocardial cells may give rise to ectopic beats and initiate re-entry around an anatomical or functional obstacle. As K(+) currents control the repolarization process of the cardiac action potential (AP), the K(+) channel function determines membrane potential and refractoriness of the myocardium. Both gain and loss of ...
de Laurentiis G - - 2008
Exhaled breath condensate (EBC) is a noninvasive method for the study of airway lining fluid. Nuclear magnetic resonance (NMR) spectroscopy can provide biochemical profiles of metabolites in biological samples. The aim of the present study was to validate the NMR metabonomic analysis of EBC in adults, assessing the role of ...
Walker Alexander M - - 2008
BACKGROUND: Nonrheumatic atrial fibrillation (AF) is a common cause of embolic stroke. Warfarin therapy can reduce stroke risk by two-thirds in patients with AF, but therapy may not always be used or always be used optimally. OBJECTIVES: This study sought to document the patterns of anticoagulant use and the determinants ...
Balasubramaniam R - - 2009
Atrial fibrillation (AF) and heart failure (HF) are the emerging epidemics of cardiovascular disease in the new millennium. Both are responsible for considerable morbidity and mortality and health budget expenditure. The advent of catheter ablation for patients with AF has provided important new insights into the relative contribution of AF ...
Rahmanian Parwis B - - 2008
Surgical treatment of atrial fibrillation (AF) using a variety of energy sources and a mixture of lesion sets has become an important adjunct in patients undergoing cardiac surgery. We retrospectively analyzed prospectively collected data of 141 patients with a history of AF (mean duration of AF 35+/-39 months; intermittent AF: ...
Arruda Mauricio - - 2008
Atrial fibrillation (AF) is highly prevalent and accounts for significant morbidity, mortality, and health care costs. Catheter ablation has become a therapeutic option in the management of this challenging arrhythmia. To optimize procedure safety and long-term efficacy, innovative technologies and ablation strategies have been targeting either the triggers initiating AF ...
Liu Tong - - 2009
Statins are highly effective and widely used lipid-lowering agents in clinical practice, that also display a number of pleiotropic properties beyond cholesterol lowering. Several trials have demonstrated that they reduce cardiovascular morbidity and mortality in both primary and secondary prevention. Atrial fibrillation (AF) and heart failure (HF) represent 2 world-wide ...
Chen Mien-Cheng - - 2008
Atrial fibrillation (AF) may be caused by structural and electrophysiological changes in the atria induced by inflammation. This study analyzed 35 adult patients with symptomatic severe mitral valve disease and moderate-to-severe tricuspid valve disease and without coronary artery disease who underwent valve operations for congestive heart failure; 18 patients had ...
John Bobby - - 2008
AIMS: To characterize the atrial remodelling in mitral stenosis (MS). METHODS AND RESULTS: Twenty-four patients with severe MS undergoing commissurotomy and 24 controls were studied. Electrophysiological evaluation was performed in 12 patients in each group by positioning multi-electrode catheters in both atria to determine the following: effective refractory period (ERP) ...
Padeletti Luigi - - 2008
BACKGROUND: Atrial fibrillation (AF) is associated with increased morbidity and mortality in patients suffering from heart failure (HF). Patients in New York Heart Association HF classes III or IV, with systolic dysfunction and a wide QRS, are candidates for cardiac resynchronization therapy (CRT), and might benefit from atrial overdrive pacing ...
Bianchi Stefano - - 2009
INTRODUCTION: Recent acute studies demonstrated that atrioventricular (AV) node vagal stimulation during atrial fibrillation (AF) decreases the mean ventricular rate, thus improving hemodynamics. METHODS AND RESULTS: We report a case of a woman with acute heart failure (HF), chronic AF with untreatable ventricular rapid response, in severe hypotensive state due ...
Zareba Karolina M - - 2008
Admission electrocardiography (ECG) in heart failure (HF) patients provides important diagnostic information; however, there are limited data regarding the prognostic significance of ECG parameters for predicting cardiac events (CEs). The ECGs of 246 patients admitted with acute HF were evaluated for heart rate, rhythm, QRS and ST-T wave abnormalities, QTc ...
Li Xu Ping - - 2008
BACKGROUND: Radiofrequency catheter ablation (RFCA) for curing atrial fibrillation (AF) is often followed by early recurrence and delayed cure, so the present study investigate the predictive factors this in patients with chronic AF. METHODS AND RESULTS: Ninety-two consecutive patients (70 males; mean age, 58.7+/-6.4 years) with chronic AF who underwent ...
Burstein Brett - - 2008
Atrial fibrillation (AF) is the most common clinically encountered arrhythmia. Conventional pharmacological antiarrhythmic approaches suffer from poor efficacy and risk of serious complications, particularly proarrhythmia. More recently, the notion of "upstream" therapy, targeting the processes involved in the development of the substrate that supports AF, has increasingly become the focus ...
Aronow Wilbert S - - 2008
Atrial fibrillation (AF) is associated with a higher incidence of mortality, stroke, and coronary events than is sinus rhythm. AF with a rapid ventricular rate may cause a tachycardia-related cardiomyopathy. Immediate direct-current cardioversion should be performed in patients with AF and acute myocardial infarction, chest pain due to myocardial ischemia, ...
Li Jiun-Yi - - 2009
OBJECTIVES: We examined the role of atrial gap junctions, NF-kappaB and fibrosis in the occurrence of postoperative atrial fibrillation (AF) in patients undergoing coronary artery bypass graft (CABG) surgery. METHODS: Forty-five patients with sinus rhythm were randomly assigned to the beating heart (n = 22) or cardioplegic cardiac arrest (n ...
Zhang Wei W Department of Cardiology, Qilu Hospital of Shandong University, Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Public Health, Ji'nan, PR - - 2009
Changes in connexins and calpains of the myocardial sleeve of the pulmonary vein and the left atrium were investigated in chronic atrial fibrillation (AF) animal models. There are no reports of changes in the calpain system and connexins in the pulmonary vein where AF is initiated. An AF animal model ...
Lu Zhibing - - 2008
BACKGROUND: The mechanism(s) for acute changes in electrophysiological properties of the atria during rapid pacing induced atrial fibrillation (AF) is not completely understood. We sought to evaluate the contribution of the intrinsic cardiac autonomic nervous system in acute atrial electrical remodeling and AF induced by 6-hour rapid atrial pacing. METHODS ...
Kalifa Jérôme - - 2008
Perturbations in energetic metabolism and impaired atrial contractility may play an important role in the pathogenesis of atrial fibrillation (AF). Besides, atrial stretch is commonly associated with AF. However, the atrial energetics of stretch-related AF are poorly understood. Here, we measured indicators of energy metabolism during acute stretch-related AF. PCr, ...
Al-Omari Malik A - - 2008
Diastolic dysfunction has been linked to 2 epidemics: atrial fibrillation (AF) and heart failure. The presence and severity of diastolic dysfunction are associated with an increased risk for first AF and first heart failure in patients with sinus rhythm. Furthermore, the risk for heart failure is markedly increased once AF ...
Melby Spencer J - - 2008
It has been hypothesized that atrial lesions must be transmural to successfully cure atrial fibrillation (AF). However, ablation lines often do not extend completely across the atrial wall. The purpose of this study was to determine the effect of residual gaps on conduction properties of atrial tissue. Canine right atria ...
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