Search Results
Results 351 - 400 of 1598
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Chang Andrew K - - 2008
A 45-year-old man with dilated cardiomyopathy, atrial fibrillation, and hypertension presented to the emergency department with palpitations and shortness of breath for 2 days after running out of his medications. An electrocardiogram disclosed atrial fibrillation with rapid ventricular response. The patient was hemodynamically unstable and failed multiple cardioversion attempts up ...
Clark John - - 2008
BACKGROUND: Newer technologies such as three-dimensional mapping and echocardiography can decrease x-ray exposure during catheter ablation. Many right-sided tachycardias can now be ablated without fluoroscopy. Left-sided tachycardias, however, have not yet been ablated using a zero fluoroscopy approach. OBJECTIVE: This study sought to examine the utility of trans-esophageal echocardiography (TEE) ...
Chen Jian - - 2008
AIMS: The recurrence of atrial fibrillation (AF) after pulmonary vein (PV) isolation is still a challenge. We investigated a new approach to treating AF patients by silencing electrical activity in the posterior inter-pulmonary-vein atrium (PIA). METHODS AND RESULTS: Three ablation steps are required to obtain PIA electrical silence: electrical PV ...
Casella Michela - - 2008
A 65-year-old man was referred for atrial fibrillation ablation to our center. Routine pre-procedure transthoracic and transoesophageal echocardiography and cardiac computed tomography examinations showed a normal interatrial septum and fossa ovalis anatomy. Access to left atrium was initially planned using a conventional transseptal needle puncture. During the procedure, several consecutive ...
Celik Turgay - - 2009
Although all beta blockers appear to be effective in the prevention of postoperative atrial fibrillation (AF) following coronary artery bypass surgery (CABG), carvedilol was found to be much more effective than metoprolol in this respect as the current study clearly delineated. We believe that the ongoing COMPACT trial will answer ...
Pap Róbert - - 2008
INTRODUCTION: While some posteroseptal and left posterior accessory pathways (APs) can be ablated on the tricuspid annulus or within the coronary venous system, others require a left-sided approach. "Fragmented" or double potentials are frequently recorded in the coronary sinus (CS), with a smaller, blunt component from left atrial (LA) myocardium, ...
Iwamoto Shinichiro - - 2008
Hemicelluloses as matrix substances showed an important role in nanofibrillation of wood pulp. Never-dried and once-dried pulps with different amounts of hemicelluloses were fibrillated using a grinding treatment. The degree of fibrillation was evaluated by scanning electron microscopy observation of the fibrillated pulps and light transmittance measurements of the fibrillated ...
Otomo Kiyoshi - - 2008
Adenosine-sensitive reentrant atrial tachycardia (AT) is usually amenable to ablation at the right superoseptum near the His bundle. We report a case with "left-variant" adenosine-sensitive reentrant AT. The AT was reproducibly induced by atrial extrastimulation with negative correlation between the coupling interval and return cycle, and was terminated by atrial ...
Cabrera José Angel - - 2008
AIMS: We examined the left lateral ridge (LLR) between the orifices of the left pulmonary veins and the left atrial appendage for a better understanding of its structural composition relevant to ablations for atrial fibrillation (AF). METHODS AND RESULTS: The LLR and its surrounding areas were studied in 40 heart ...
Freeman William D - - 2008
Warfarin-related intracerebral hemorrhage (WICH) is a medical and neurosurgical emergency with a 1-month mortality of approximately 50%. Warfarin is commonly is used in patients with atrial fibrillation to prevent ischemic stroke and to prevent progression of deep vein thrombosis to pulmonary embolism. Owing to the ageing population, and increased incidence ...
Crowley David I - - 2008
The authors describe the use of Amplatzer occlusion devices to successfully occlude Fontan baffle leaks in three patients. These additional right to left shunts were recognized at the time of elective transcatheter closure of surgically created fenestrations. A common site of baffle leak is described at the base of the ...
Melduni Rowlens M - - 2008
BACKGROUND: Direct-current cardioversion (DCCV) of atrial fibrillation and atrial flutter commonly causes post-DCCV left atrial (LA) stunning (LAS), which may potentiate thromboembolic complications. Data on LAS determinants are inconclusive. METHODS: We prospectively evaluated LA and LA appendage function before and immediately after DCCV of atrial fibrillation and atrial flutter in ...
Lemola Kristina - - 2008
BACKGROUND: Pulmonary vein (PV) -encircling radiofrequency ablation frequently is effective in vagal atrial fibrillation (AF), and there is evidence that PVs may be particularly prone to cholinergically induced arrhythmia mechanisms. However, PV ablation procedures also can affect intracardiac autonomic ganglia. The present study examined the relative role of PVs versus ...
E. Kevin Heist
Successful catheter ablation of atrial fibrillation (AF) requires a detailed understanding of left atrial anatomy in order to maximize the safety and efficacy of the procedure. Common and rare variants of left atrial and pulmonary venous anatomy have been described which can affect the optimal ablation strategy for each individual ...
Andrea Corrado
In this study the authors compared two different ablation strategies for the treatment of paroxysmal atrial fibrillation (AF): selective isolation of the pulmonary vein triggering AF (SePVI) versus empirical isolation of all the four pulmonary veins (EmPVI).
Sentürk Tunay - - 2008
We report on a patient in whom a giant thrombus in the left atrium was detected by transthoracic echocardiography. Anticoagulant theraphy was started. After two months of therapy, repeat echocardiography showed complete resolution of the thrombus. This case indicates that large and presumably organised thrombi may be treated with anticoagulant ...
Reddy Vivek Y - - 2008
Just more than a decade ago, Haissaguerre and colleagues provided the seminal demonstration of the role of pulmonary vein triggers in the pathogenesis of atrial fibrillation (AF) and the potential therapeutic role of catheter ablation to treat patients who have paroxysmal AF. This initial observation ushered in the modern era ...
Tsao Connie W - - 2008
BACKGROUND: Anatomic atrial enlargement is associated with significant morbidity and mortality. However, atrial enlargement may not correlate with clinical measures such as electrocardiographic (ECG) criteria. Past studies correlating ECG criteria with anatomic measures mainly used inferior M-mode or two-dimensional echocardiographic data. We sought to determine the accuracy of the ECG ...
Ruggiero Alberto - - 2008
The case of a 66-year-old patient with acute intramural haematoma in descending aorta, receiving anticoagulant treatment with warfarin for chronic atrial fibrillation, is presented. Transoesophageal echocardiography was fundamental in the diagnosis of the intramural haematoma, assessment of the cardioembolic risk of atrial fibrillation and in follow-up the evolution of the ...
Yamada Takumi - - 2008
A 70-year-old man with atrial fibrillation underwent pulmonary vein (PV) isolation (PVI). Bigeminal concealed PV depolarizations persisted within the right superior PV throughout the PVI. Though the PV depolarizations was suppressed after successful PVI, PV depolarization, following a slow intrinsic PV automatic rhythm, was observed. The coupling interval of the ...
Yamada Takumi - - 2008
A 58-year-old man with atrial fibrillation underwent pulmonary vein (PV) isolation (PVI). Bigeminal atrial premature beats persisted from the beginning of the PVI. The cardiac recordings from a basket catheter (BC) revealed the PV ectopic origin in the distal right superior PV. Successful PVI with the guidance of BC was ...
Pokushalov Evgueny - - 2008
PURPOSE OF REVIEW: To analyse recent experimental and clinical studies and show that all the pathological events occurring in the myocardium during atrial fibrillation are caused by changes in the autonomic nervous system. The current methods of radiofrequency ablation focus on damaging healthy myocardial tissue involved in the dysregulation caused ...
Yu Ronghui - - 2008
BACKGROUND: Common ostium of the inferior pulmonary veins (PVs) is a kind of unusual variation in pulmonary venous drainage to the left atrium (LA), whose feature of anatomy, electrophysiology, and catheter ablation is rarely demonstrated, and the consecutive series of research for catheter ablation of atrial fibrillation (AF) in patients ...
Ota Takeyoshi - - 2008
We have developed a novel, highly articulated robotic surgical system to enable minimally invasive intrapericardial interventions through a subxiphoid approach and have performed preliminary tests of epicardial left atrial ablation in porcine (N=3) and human cadaver (N=2) preparations. In this study, the novel highly articulated robotic surgical system successfully provided ...
Swamy Gokul - - 2008
We developed a technique to quantify forward and backward arterial waves by model-based analysis of aortic and femoral artery pressure waveforms. Thus, in contrast to conventional techniques, our technique does not require a more difficult arterial flow measurement. We validated the forward and backward waves through a set of canine ...
Waldo Albert L - - 2008
It is well recognized that during atrial fibrillation (AF), clots may form in the left atrium. This, in turn, may lead to embolization of the clot, with resulting ischemic stroke or systemic embolism. Also, the presence of AF confers a fivefold increased risk for stroke. AF is the most common ...
Kiatchoosakun Songsak - - 2008
BACKGROUND: Systemic embolism is one of the major complications in patients with mitral stenosis (MS) who are in atrial fibrillation; however, this serious complication can also occur in patients with MS in sinus rhythm. OBJECTIVE: The purpose of the present study was to identify the predictive factors of systemic emboli ...
Bayraktar Ulas Darda - - 2008
Atrial fibrillation was previously reported in patients with esophageal cancer as a complication of total esophagectomy or photodynamic therapy. Here, we propose that atrial fibrillation may also be caused by external compression of the left atrium by esophageal cancer. We present a 58-year-old man who developed atrial fibrillation with rapid ...
Kiser Andy C - - 2008
BACKGROUND: Current surgical treatments for atrial fibrillation (AF) lack intraoperative metrics that predict long-term outcomes. The extracardiac maze (Ex-Maze) procedure is a beating-heart maze procedure that causes spontaneous conversion to sinus rhythm (SR) during lesion creation. Spontaneous conversion and confirmation of pulmonary vein exit block are 2 important predictors of ...
Romero-Rodriguez Nieves - - 2008
We describe the case of a patient who developed a thrombus on the transseptal sheath in the right atrium before transseptal puncture for circumferential pulmonary vein isolation for paroxysmal atrial fibrillation treatment. The use of intracardiac echocardiography allowed to its identification and probably prevented the patient from suffering a serious ...
Moreira Wendel - - 2008
The introduction of percutaneous ablative treatments for atrial fibrillation led to new information regarding the region of the left atrium and pulmonary veins, which electrophysiologists had previously overlooked. Initially, procedures for treating atrial fibrillation involved ablation and then the isolation of specific points in the pulmonary veins; this technique is ...
Krishnan Subramaniam C - - 2008
We present autopsy data from a patient that illustrates the anatomical factors that allow the esophagus to be a mobile structure, especially with respect to the posterior left atrial wall.
Mueller-Hoecker Josef - - 2008
Cardiomyocytes in pulmonary veins (PVs) have been reported in rodents and humans. In humans they were related to atrial arrhythmias, including atrial fibrillation (AF). To investigate histological similarities and differences in PV cardiomyocyte localization and distribution, we performed comparative light and electron microscopic studies on humans, rats and mice, and ...
Lee Dong Won - - 2007
Catheter ablation of the left free-wall accessory pathways (APs) is normally performed by the retrograde transaortic approach via a femoral artery or the transseptal approach. Here we report a case of an overt left free-wall AP, which was successfully ablated with a retrograde transaortic approach via the radial artery without ...
Vaitkevicius Raimundas - - 2008
The aim of the study was to determine the anatomy of intrinsic nerves supplying human pulmonary veins (PVs). Twenty-two hearts of human fetuses with full sets of PVs were examined using a histochemical method for acetylcholinesterase in order to stain transmurally intrinsic neural structures on non-sectioned PVs for subsequent stereomicroscopic ...
Stabile Giuseppe - - 2007
We report a case of a tailored approach to atrial fibrillation based on the substrate. In a patient with paroxysmal atrial fibrillation, electroanatomic mapping showed that atrial fibrillation was limited to a large area around the ostia of right pulmonary veins. The patient was successfully treated by catheter anatomic isolation ...
Calò Leonardo - - 2007
Left anterior accessory pathways are considered to be rare. The junction between the mitral and aortic valves consists of a continuous fibrous tissue. Nevertheless, muscular pathways connecting the left atrial and ventricular myocardium through the fibrous ring between these valves have been observed very rarely. Few reports about successful ablation ...
Rosamond Thomas - - 2007
An intracameral or intracavitary course for a coronary artery is a rare anomaly. Nevertheless, it carries a significant impact for invasive cardiac procedures that require right atrial catheterization, pacemaker implantation, or electrophysiologic study such as radiofrequency ablation. If a coronary artery were to be damaged within the atrial chamber by ...
Yamada Takumi - - 2007
Two cases of paroxysmal atrial fibrillation (AF) first occurred 15 and 36 years, respectively, after isolated direct suture closure of an atrial septal defect (ASD) and failed to be controlled by antiarrhythmic drug therapy. In these cases, an atrial transseptal procedure was feasible and no residual iatrogenic ASD was observed, ...
Koyama Junjiroh - - 2007
BACKGROUND: Little information exists regarding the precise distribution of verapamil-sensitive atrial tachycardia originating from the vicinity of the atrioventricular node (V-AT). METHODS: In 12 patients with V-AT, we examined the spatial and topologic distribution of tachycardia origin relative to the His bundle (HB) site. The V-AT origin was divided into ...
Horlitz Marc - - 2008
Circumferential pulmonary vein ablation performing linear lesions around the ostia of the pulmonary veins has been shown to be effective for the treatment of atrial fibrillation. During the follow-up period, persistent atrial tachycardia may occur as a proarrhythmic complication. Only little information is available about the underlying mechanism. In our ...
Geuzebroek Guillaume S C - - 2008
Different lesion sets and ablation techniques have been performed. We compared these outcomes in search of the best method. We performed a retrospective analysis of patients who have undergone AF surgery different from the maze III. The surgical lesion sets were pulmonary vein isolation (PVI) alone, left atrial maze (LAM) ...
Phillips Karen P - - 2008
Focal atrial tachycardias originating from the left atrial appendage present unique anatomic challenges for successful ablation. We describe the role of minimally invasive percutaneous epicardial mapping and ablation in the management of two patients with ectopic atrial tachycardias arising from the left atrial appendage following failure of a conventional endocardial ...
Kim Susan S - - 2007
Left atrial muscle sleeves extending over the pulmonary veins are critical to the initiation of atrial fibrillation (AF) in some patients. This report describes two patients with paroxysmal AF who demonstrate widely-split pulmonary vein (PV) double potentials at the pulmonary vein ostium during sinus rhythm. The response by the double ...
Pappone Carlo - - 2007
Catheter ablation techniques for atrial fibrillation are evolving with targets for radiofrequency ablation of atrial fibrillation increasingly being selected based on anatomic considerations. Such anatomic ablation techniques require precise catheter localization and stable contact during ablation. Even experienced electrophysiologists occasionally encounter difficulties in maintaining stable catheter contact, especially in some ...
Yamada Takumi - - 2007
BACKGROUND: Pulmonary vein (PV) isolation (PVI) has been demonstrated to be an effective technique for curing atrial fibrillation (AF). AF foci that cannot be isolated by PVI (non-PV foci) can become the cause of AF recurrence. The purpose of this study was to investigate the characteristics of non-PV AF foci. ...
Ruchat Patrick - - 2007
AIMS: Surgical ablation procedures for treating atrial fibrillation have been shown to be highly successful. However, the ideal ablation pattern still remains to be determined. This article reports on a systematic study of the effectiveness of the performance of different ablation line patterns. METHODS AND RESULTS: This study of ablation ...
Immer Franz F - - 2007
BACKGROUND: Minimal extracorporeal circulation (MECC) is a promising perfusion technology, taking the advantage of an ECC while having a significantly reduced priming volume. We analyzed the actual possible benefits of using MECC in patients undergoing CABG procedures and compared the results with conventional extracorporeal circulation (CECC). METHODS: One thousand fifty-three ...
Li Shufeng - - 2009
The development of pulmonary vein stenosis has recently been described after radiofrequency ablation (RF) to treat atrial fibrillation (AF). The purpose of this study was to examine expression of TGFbeta1 in pulmonary vein stenosis after radiofrequency ablation in chronic atrial fibrillation of dogs. About 28 mongrel dogs were randomly assigned ...
Yano Akio - - 2007
A 76-year-old man with two different sustained atrial arrhythmias that occurred after coronary artery bypass grafting underwent electrophysiological studies. Macroreentrant atrial tachycardias were detected with an isolated slow pathway mimicking focal activation on three-dimensional electroanatomical mapping. The slow conduction pathway in the right atrial free wall was assumed to represent ...
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