Search Results
Results 451 - 500 of 1626
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Yao Yan - - 2007
BACKGROUND: This study attempted to convert atrial fibrillation (AF) to sinus rhythm using a stepwise linear catheter ablation approach. METHODS: One hundred and ninety-six patients (43 with persistent AF) were enrolled in the study. A multiple electrode array was used for anatomical navigation and activation mapping. Continuously incremental stimulation was ...
Barrett Conor D - - 2007
Atrial flutter typically has a cycle length of 200 ms (300 cycles/min or 5 Hz); with 4:1 conduction through the AV node, this would lead to a ventricular rate of 75 bpm. We present a case of a patient with a Parkinsonian tremor at a frequency of 300 cycles/min that ...
Rostock Thomas - - 2007
The coronary sinus (CS) has been described as a substrate being involved in the atrial fibrillation (AF) process. However, there are no data describing the CS as a single source of AF. We report a patient with paroxysmal AF who demonstrated an arrhythmogenic focus within the proximal CS as single ...
Ashino Sonoko - - 2007
Whether the activation sequence of the right or left atrium plays a role in the morphology of the flutter wave in common atrial flutter is not completely understood. We present two patients with common counterclockwise atrial flutter in whom changes in the left atrial activation sequence produced significant changes in ...
Sanders Prashanthan - - 2007
AIMS: To evaluate the contribution of the posterior left atrium (LA) to chronic atrial fibrillation (AF). METHODS AND RESULTS: Twenty-seven patients with chronic-AF were studied. After pulmonary vein (PV) isolation, the posterior-LA was isolated by ablation joining the right- and left-PVs using an irrigated-tip catheter. Isolation was demonstrated by absent/dissociated ...
Preis Ori - - 2007
Atrioesophageal fistula is a rare but highly morbid complication of catheter-mediated pulmonary vein ablation for the treatment of atrial fibrillation. Among patients who do not exsanguinate from upper gastrointestinal tract bleeding, presentation includes sepsis and embolic cerebrovascular disease. We present a case of atrioesophageal fistula after pulmonary venous ablation as ...
Stec S - - 2007
The present case study reports a case of chronic cough and cough syncope associated with frequent premature ventricular complexes (PVCs). Careful analysis of cough-related symptoms and ECG monitoring led to the suspicion of PVC-induced cough. A coincidence between PVCs and episodes of cough was also documented by a portable multichannel ...
Tao Hailong - - 2008
Complex fragment atrial electrograms (CFAEs) are fractionated or discrete atrial wave fronts that frequently mapped in chronic atrial fibrillation (CAF). The CFAEs areas represent slow conduction and/or functional blocks that play substrate role in AF. Compared with the limited efficacy of pulmonary veins (PVs) oriented ablation strategy for CAF, few ...
Wu Mei-Han - - 2007
INTRODUCTION: Atrio-bronchial fistula (ABF) can be a rare but potentially lethal complication following the catheter ablation of atrial fibrillation (AF). Understanding the extent of the contact between the bronchial tree and pulmonary veins (PVs) is critical to avoid this complication. We investigated the anatomic relationship between the four PVs and ...
Patterson Eugene - - 2007
INTRODUCTION: Rapid firing originating within pulmonary veins (PVs) initiates atrial fibrillation (AF). The following studies were performed to evaluate spontaneous PV firing in patients with AF to distinguish focal versus reentrant mechanisms. METHODS: Intracardiac recordings were obtained in 18 patients demonstrating paroxysmal AF. Microelectrode (ME) recordings were obtained from superfused ...
Bortone Agustín - - 2007
INTRODUCTION: Dual tachycardias associating paroxysmal atrial fibrillation (AF) with double-exit left aortic sinus cusp tachycardia (LASCT) are described for the first time in a patient referred for AF ablation. CASE: Both tachycardias were successfully ablated under Carto-Merge guidance. Noteworthy, vagal denervation during AF ablation was responsible for an immediate decrease ...
Kumagai Koichiro - - 2007
INTRODUCTION: Esophageal injury is a potential complication after catheter ablation of the posterior left atrium (LA). Therefore, we describe a new approach for complete isolation of the posterior LA including all pulmonary veins (PVs) without vertical lesions along the esophageal aspect of the posterior LA, namely Box isolation. METHODS AND ...
Nadeau Réginald - - 2007
In anesthetized dogs both epi-and endocardial atrial activation maps and corresponding isointegral repolarization maps were created before and during right or left mediastinal nerve (RMN and LMN) and cervical vagus nerve (CVN) stimulation. Right mediastinal nerve stimulation typically caused sinus slowing, atrial tachycardia (AT), followed by atrial fibrillation (AF). Activation ...
Hadjicostas Panayiotis T - - 2007
PURPOSE: The difference in ultimate strength between the quadriceps and patellar tendon could be reflected by different morphologic features. METHODS: Standardized samples of quadriceps and patellar tendons were harvested from 20 cadavers and were investigated via light and electron microscopy, immunohistochemistry, and morphometry. The thickness of collagen fibrils, fibril-interstitium ratio, ...
Kodama Takahide - - 2008
We report a case of a 68-year-old man who had dialysis-related amyloidosis. The patient underwent neck surgery due to spondyloarthritis. Unfortunately he died after the surgery in sepsis. The preoperative routine echocardiography didn't suggest cardiac involvement of amyloidosis. However, the pathological findings in autopsy revealed severe amyloid depositions of both ...
Bertaglia Emanuele - - 2007
BACKGROUND: Data on the procedural safety of pulmonary vein radiofrequency catheter ablation for atrial fibrillation (AF) are as yet scant. OBJECTIVE: The aims of the present study were to prospectively evaluate the incidence of early complications of pulmonary vein ablation for AF in an unselected population of consecutive patients, and ...
Barker Claire - - 2007
An intact atrial septum places infants with hypoplasia of the left heart into a group with an extremely high rate of mortality. We report a neonate, diagnosed antenatally, who was delivered by Caesarian section in the cardiac theatre, urgently placed onto cardiopulmonary bypass, and who then underwent an atrial septectomy ...
Gerstenfeld Edward P - - 2007
BACKGROUND: We sought to compare the efficacy and collateral damage during pulmonary vein (PV) isolation in a canine model using three different ablation strategies. METHODS: Normal dogs (three each) were randomized to high power (70 W, 20 seconds, 60 degrees C, Hi), medium power (50 W, 60 seconds, 50 degrees ...
Soleimani Aliakbar - - 2008
Left atrial appendage aneurysm is a rare abnormality and a diagnostic dilemma in patients with cardiomegaly. Patients most commonly present with atrial tachyarrhythmias and thromboembolic events. Resection of the aneurysm is usually curative. We report herein the case of a 27-year-old man with massive left atrial appendage aneurysm diagnosed incidentally ...
Kuo Jen-Yuan - - 2007
OBJECTIVE: The objective of this study was to evaluate production or release of CNP in individuals without CHF. METHODS: Nineteen patients with symptomatic paroxysmal supraventricular tachycardia (PSVT) and normal left ventricular systolic function were enrolled into the study. Blood samples were collected from the coronary sinus (CS), the femoral artery ...
Derntl Michael - - 2007
Two female patients undergoing left atrial radiofrequency catheter ablation developed Tako-tsubo cardiomyopathy. This reversible form of left ventricular dysfunction is known to occur under conditions associated with marked sympathetic nervous activation. Radiofrequency catheter ablation in the left atrium can damage autonomic ganglionated plexi, leading to vagal withdrawal, thus resulting in ...
Bédard Christian - - 2007
BACKGROUND: Thrombosis and arterial thromboembolism are frequent complications of feline cardiomyopathy, especially when associated with left atrial enlargement. Markers of activated coagulation may be used to evaluate the coagulation status of cats with hypertrophic cardiomyopathy (HCM) in relation to left atrial size. OBJECTIVES: The objective of this study was to ...
Nakamura Takeshi - - 2007
OBJECTIVES: Postoperative atrial fibrillation is associated with the increased incidence of morbidities and mortality. Predisposing determinants of atrial fibrillation development after off-pump coronary artery bypass grafting remain unclear. We hypothesized that pericardial fluid natriuretic peptide concentrations have a predictive value for developing postoperative atrial fibrillation in patients who have undergone ...
Ho Ivan - - 2007
INTRODUCTION: With the increasing use of pre-procedural imaging techniques such as magnetic resonance imaging (MRI) and their integration with electroanatomic mapping systems in catheter ablation for atrial fibrillation (AF), atypical anatomy of the pulmonary veins (PV), left atrium (LA) and their relationship to the thoracic aorta is increasingly recognized. OBJECTIVE: ...
Kato Masaru - - 2007
A 36-year-old woman presented with drug-refractory atrial tachycardia. During the tachycardia episodes, P waves were positive in leads II, III, aVF, and V1, while they were negative in leads I and aVL. It was hard to determine whether the origin was the left atrial appendage or left superior pulmonary vein ...
Nakai Motoki - - 2007
AIM: To evaluate the effects of combined radiofrequency ablation and transcatheter arterial embolization with iodized oil on ablation time, maximum output, coagulation diameter, and portal angiography in a porcine liver model. METHODS: Radiofrequency ablation (RFA) was applied to in vivo livers of 10 normal pigs using a 17-gauge 3.0 cm ...
Scholz Eberhard P - - 2007
In a routine ECG from a young asymptomatic woman, changes in P-wave morphology and the frontal plane atrial vector were noted. Two-dimensional echocardiography revealed a large atrial septal aneurysm as probable underlying cause. This case report demonstrates that non-specific right atrial ECG signs may be indicative of lone atrial septal ...
Ejima Koichiro - - 2007
Irregular tachycardias mimicking atrial fibrillation (AF) have previously been described. We report a case of a 60-year-old man with an antiarrhythmic drug-resistant atrial tachycardia (AT) mimicking AF. The tachycardia consisted of two distinct ATs with interference of one repetitive AT with another sustained AT. Radiofrequency (RF) ablation of two distinct ...
Gerstenfeld Edward P - - 2007
OBJECTIVE: The purpose of this study was to describe the surface electrocardiogram (ECG) morphology of common atrial tachycardias (ATs) that occur after pulmonary vein (PV) isolation. BACKGROUND: Focal ATs from reconnected PVs and macroreentrant mitral annular (MA) flutter are the most common form of ATs occurring after PV isolation. METHODS: ...
Yamada Takumi - - 2007
Pulmonary vein isolation (PVI) guided by circumferential mapping has been established as a curative treatment of atrial fibrillation. In the PVI technique, two transseptal catheters are necessary for mapping and catheter ablation. The one-puncture, double-transseptal catheterization manoeuvre is generally used in the PVI technique. However, to the best of our ...
Su P - - 2008
BACKGROUND: Occlusion of the left atrial appendage (LAA) is thought to reduce the risk of thromboembolic events in patients with atrial fibrillation. OBJECTIVE: To examine the LAA and its relationship to neighbouring structures that may be put at risk when intervening to occlude its os. METHODS: 31 heart specimens were ...
Scherr Daniel - - 2007
BACKGROUND: Complex fractionated atrial electrograms (CFAEs) have been reported as ablative targets for the treatment of atrial fibrillation (AF). However, the process of CFAE identification is highly dependent on the operator's judgment. OBJECTIVE: It is the aim of the study to report our initial experience with a novel software algorithm ...
Tada Hiroshi - - 2007
We describe two cases of swallowing-induced tachyarrhythmias that were cured by radiofrequency ablation (RFCA) using a non-contact mapping system (NCMS). In both patients, tachyarrhythmias occurred during swallowing solids and liquids, and mapping and ablation of the arrhythmia using the NCMS was attempted during swallowing a rice ball. During a premature ...
Arya Arash - - 2007
Outflow tract ventricular tachycardias (OT-VTs) re the most common form of idiopathic VTs. In>80-90% of cases OT-VT originates from the right ventricular outflow tract, however, other origins like the septum, the left ventricular outflow tract, the pulmonary artery, the aortic sinus of Valsalva, the area near the His bundle, and ...
Lupinski R W - - 2007
Lymphatics of the heart have not generated any broad or sustained interests among clinicians. Few publications on cardiac lymphatics are available, anatomy not routinely known and the true role of cardiac lymphatics remains doubtful. One important anatomical concept needing clarification is that of the lymphatic nature of conduction tissue. Sino-atrial ...
Puskas John - - 2007
A 46-year-old woman with a 7-year history of profoundly symptomatic daily paroxysmal atrial fibrillation had undergone two percutaneous catheter ablations and multiple medication trials. With informed consent, bilateral pulmonary vein isolation and left atrial appendage occlusion as well as ablation of ganglionated plexi were performed by a totally thoracoscopic technique ...
Leeson Paul - - 2007
Transesophageal echocardiography was requested for a 20-year-old woman admitted to the intensive care department after being involved, as a restrained driver, in a road traffic accident. During the study a striking abnormality was noted around the left atrial appendage and left upper pulmonary vein. The clinical history of blunt chest ...
Wu Joseph C - - 2007
A 59-year-old woman was admitted to the hospital after having severe headache for 1 day. Her medical history was significant for coronary artery disease, diabetes, atrial fibrillation, and rheumatic heart disease. The patient was in remission from stage II left breast cancer (T2 N0 M0) in 1997, treated with lumpectomy, ...
El-Chami Mikhael F - - 2007
Atrial fibrillation (AF) is the most common sustained arrhythmia and a leading cause of stroke. Warfarin reduces the incidence of thromboemboli and is recommended for most patients with AF. However, oral anticoagulation is contraindicated or not tolerated by a significant percentage of patients with AF. Occlusion of the left atrial ...
Ren Jian-Fang - - 2007
Catheter-based radiofrequency ablation in the left heart can provide effective therapy for tachyarrhythmias. The recent development of the real time intracardiac echocardiography (ICE) with 2D and Doppler color flow imaging can facilitate left heart ablation procedures. This report reviews the use of ICE during radiofrequency catheter ablation procedures for atrial ...
Reithmann Christopher - - 2007
The NavX system was used to guide mapping and successful ablation of a reciprocating antidromic tachycardia involving anterograde conduction over a nodo-fascicular fibre and retrograde conduction over the His bundle and AV node. This novel mapping system allowed visualization of the lower insertion site of the nodo-fascicular accessory pathway approximately ...
Karayannis George - - 2008
Systolic heart failure (HF) is a progressive disorder that often begins with asymptomatic left ventricular (LV) systolic dysfunction and culminates in symptoms from fluid overload and poor end-organ perfusion. The progression to symptomatic HF is accompanied by marked activation of neurohormonal and cytokine systems, as well as a series of ...
Ryu Kyungmoo - - 2007
The canine sterile pericarditis model is characterized by impaired conduction and atrial arrhythmia vulnerability. Electrical and structural remodeling processes caused by the inflammatory response likely promote these abnormalities. In the present study, we tested the hypothesis that altered distribution of atrial connexins is associated with markedly abnormal atrial conduction, thereby ...
Gong Yunfan - - 2007
BACKGROUND: The mechanisms underlying paroxysmal atrial flutter/atrial fibrillation initiation by ectopic foci from various locations are unclear. METHODS AND RESULTS: We used parallel computational techniques to study an anatomically accurate 3-dimensional atrial structure incorporating a detailed ionic-current model of an atrial myocyte. At the single-cell level, upregulation of the L-type ...
Oh Yu Whan - - 2007
This article has been removed, consistent with Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). The Publisher apologizes for any inconvenience this may cause.
Imperiale D - - 2007
We describe a 63-year-old man in sinus rhythm (SR) with an ischaemic stroke involving basal ganglia region on the right side. The patient was known to be heterozygous for factor V Leiden (FVL) mutation. On diagnostic work-up, no arterial sources of embolism were found. Transoesophageal echocardiography evidenced a left atrial ...
Beall Jennifer W - - 2007
A 65-year-old Caucasian male with a shellfish allergy developed atrial fibrillation and hypotension after coronary artery bypass and duodenal ulcer surgery. Following electrical cardioversion, oral amiodarone was continued chronically without an allergic reaction. There is a common misconception that a shellfish allergy correlates to an iodine allergy. There is little ...
Ciarka Agnieszka - - 2007
BACKGROUND: We have reported previously that the sympathetic nervous system is activated in patients with pulmonary arterial hypertension (PAH), and that this is only partly explained by a decrease in arterial oxygenation. Possible causes for increased muscle sympathetic nerve activity (MSNA) in patients with PAH include right atrial distension and ...
Donnino Robert - - 2008
A 79-year-old woman with severe aortic stenosis underwent aortic valve replacement surgery, and had ligation of the left atrial appendage (LAA) using an epicardial approach. On a post-operative echocardiographic evaluation, the distal portion of the LAA was excluded, leaving no communication with the left atrium. The proximal portion of the ...
Schneider Carsten - - 2007
BACKGROUND: Pulmonary vein stenosis (PVS) has been described as a complication after primary catheter ablation of atrial fibrillation (Afib). The purpose of this study was to evaluate the utility of transesophageal echocardiography (TEE) as follow-up tool after catheter ablation of Afib and interventional therapy of PVS and pulmonary vein occlusion ...
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