Search Results
Results 351 - 400 of 1786
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Jones Douglas L - - 2008
We previously published encircling endocardial cryo-isolation of the pulmonary vein (PV) region. This study documented mechanisms of isolation failure using CARTO mapping. Cryo-isolation used a modified Surgifrost introduced via a Universal Cardiac Introducer on the left atrial appendage. Of five pigs, two had incomplete isolation and repeat mapping: Activation was ...
Szili-Torok Tamas - - 2008
The improvement of surgical techniques resulted in significant life prolongation of many young patients with congenital heart disease (CHD). However, as these patients reach adulthood, their risk for late complications associated with surgery is also increased. One of the most difficult challenges associated with CHD is the high incidence of ...
Barbato Gaetano - - 2008
OBJECTIVE: Atrial transseptal puncture is nowadays routinely performed in the electrophysiology laboratory in order to map and ablate the left atrium. Some concerns, however, exist as to whether to perform atrial transseptal puncture in patients with heart valve prostheses, because of the risk of damaging the valve and of prosthetic ...
Zeppenfeld Katja - - 2008
Catheter ablation is an important therapeutic option for controlling recurrent ventricular arrhythmias in patients with heart disease. Although implantable defibrillators are generally first line therapy in this patient population, a substantial number of patients require additional therapy with either antiarrhythmic drugs, ablation, or both. Studies of mapping and ablation have ...
Yamada Takumi - - 2008
A 10-year-old boy with a supraventricular tachycardia was referred for catheter ablation. An electrophysiologic study revealed a left lateral concealed accessory pathway (AP). A few radiofrequency (RF) applications targeting the AP resulted in an inadvertent intra-atrial conduction block at the mitral isthmus without any damage to the AP. Adenosine was ...
Nadji G - - 2008
Transcatheter cryoablation is an alternative option for the treatment of supraventricular tachycardia, due to its very low risk of permanent atrio-ventricular block. However, the overcost of cryocatheter and the high recurrence rate of this emerging technology braked its large use. This study reports the results of an approach using cryoablation ...
Gami Apoor S - - 2008
Atrial tachycardias have been successfully ablated from the noncoronary cusp of the aortic valve. The anatomical substrate responsible for the arrhythmia in these patients is unknown. We report a case of intracardiac ultrasound confirmed ablation in the right coronary cusp of the aortic valve. Pacing maneuvers performed in this case, ...
Benussi Stefano - - 2008
OBJECTIVE: Despite its efficacy and swiftness, bipolar radiofrequency is generally not used on the left isthmus for concern of injuring a coronary branch. Incomplete lesion sets or use of an additional unipolar device are often considered. We report a technique to perform a full left lesion set involving the mitral ...
Saul J Philip - - 2008
Patients who have undergone repair of congenital heart disease are at risk for atrial and ventricular tachyarrhythmias and sudden death, both because of altered substrate for arrhythmias and an altered hemodynamic response. Despite an armamentarium of arrhythmia management tools, including drug therapy, antibradycardia, pacing, antitachycardia pacing, surgical ablation and catheter ...
Dipen Shah
Typical atrial flutter and atrial fibrillation are frequently observed to coexist(1) .&nbsp; In the current context of interventional electrophysiology, curative or at least definitive ablation is available for both arrhythmias. Despite their coexistence, it is not clear whether typical flutter ablation is necessary in all patients undergoing catheter ablation of ...
James C. Hansen
Case:&nbsp; A 64-year-old woman presented with palpitations.&nbsp; Her 24-hour Holter monitor revealed runs of presumed atrial fibrillation (AF).&nbsp; The patient was referred for EP study and AF ablation. EPS:&nbsp; At EPS, an anterograde A-H jump was noted.&nbsp; Spontaneous bursts of tachycardia were seen, consisting of sinus atrial beats with dual ...
Sanjay Dixit
Catheter based ablation has become a popular treatment strategy in the management of patients with atrial fibrillation (AF). Although patients undergoing AF ablation can expect success rates in excess of 80%, 1-3 the procedure is associated with a small risk of complications, the commonest of which is the development of ...
Hokimoto Seiji - - 2008
A 53-year-old man was admitted to our hospital for dyspnea, associated with atrial tachycardia. He underwent mitral valve replacement and Maze operation for mitral regurgitation and atrial fibrillation and since then he suffered from drug refractory atrial tachycardia followed by cardiogenic shock with systolic heart failure. Atrial tachycardia with rapid ...
Shan Qijun - - 2008
We report a 30 year old male without structural heart disease who presented with recurrent nocturnal syncope and aborted sudden cardiac death. 12-lead ECG showed elevated ST in inferior leads and short coupled premature ventricular complexes (PVCs). Propafenone challenge suggested a diagnosis of an atypical Brugada syndrome. Two morphological types ...
Roshan John - - 2008
Coronary sinus cannulation during an electrophysiology study can be quite challenging. This article describes a new technique that we use to cannulate the coronary sinus in cases where cannulation is not easy. The technique involves using a deflectable quadripolar catheter as a buddy to enable the decapolar catheter to slip ...
Chakravarthy Murali - - 2008
The intraaortic balloon pulsation (IABP) catheter is commonly used to treat left ventricular failure. The abnormality of the descending thoracic and abdominal aorta is considered as a relative contraindication for its insertion. We present here a patient with acute myocardial infarction with a post-infarct ventricular septal defect who presented with ...
Haghjoo Majid - - 2008
BACKGROUND: Prediction of accessory pathway (AP) location before radiofrequency ablation has become increasingly important for patients with AP; this is especially true for posteroseptal (PS) APs. OBJECTIVE: To identify electrocardiographic and electrophysiologic predictors of pathway location in patients with manifest posteroseptal AP. METHODS: A detailed electrocardiographic analysis, electrophysiologic study, and ...
Bonakdar Hamid Reza - - 2008
The coronary sinus activation pattern is an important clue for the detection of arrhythmia mechanisms and/or localization of accessory pathways. Any change in this pattern during radiofrequency ablation should be evaluated carefully to recognize the presence of another accessory pathway or innocence of the accessory pathway during arrhythmia. Intra-atrial conduction ...
Bhakta Deepak - - 2008
Electrophysiologic testing and radiofrequency ablation have evolved as curative measures for a variety of rhythm disturbances. As experience in this field has grown, ablation is progressively being used to address more complex rhythm disturbances. Paralleling this trend are technological advancements to facilitate these efforts, including electroanatomic mapping (EAM). At present, ...
Reddy Vivek Y VY Cardiac Arrhythmia Service, Massachusetts General Hospital, Boston, - - 2007
For patients who have a ventricular tachyarrhythmic event, implantable cardioverter-defibrillators (ICDs) are a mainstay of therapy to prevent sudden death. However, ICD shocks are painful, can result in clinical depression, and do not offer complete protection against death from arrhythmia. We designed this randomized trial to examine whether prophylactic radiofrequency ...
Weber Reinhold - - 2008
BACKGROUND: More extensive ablation strategies for the treatment of atrial fibrillation (AF) have increased success rates but are associated with new and sometimes serious complications. We describe a new complication after extensive radiofrequency (RF) ablation in the left atrium (LA) for persistent AF. METHODS AND RESULTS: Electroanatomic guided circumferential ablation ...
Rao Liyun - - 2008
Multiple imaging modalities are employed independent of one another while managing complex cardiac arrhythmias. To combine electrical, anatomical, and functional imaging in a single catheter system, we developed a balloon catheter that carried 64 electrodes on its surface and an intracardiac echocardiography (ICE) catheter through a central lumen. The catheter ...
Ad Niv - - 2007
Atrial fibrillation (AF) may be associated with significant morbidity and mortality, which are directly related to its detrimental sequelae: significant symptoms, tachycardia-induced cardiomyopathy, and systemic thromboembolism. In recent years, symptomatic patients are being referred to have either catheter-based ablation or surgical ablation. In this report, the history, results, and predictors ...
Kaseno Kenichi - - 2007
A patient underwent radiofrequency (RF) catheter ablation for a drug-refractory ventricular tachycardia, but RF energy application at an endocardial site of the left ventricular outflow tract and at the left sinus of Valsalva could not eliminate the tachycardia. The earliest ventricular activation during the arrhythmia, which preceded the onset of ...
Garcia F C - - 2007
Ablation is an important management tool for the treatment of ventricular arrhythmias. Even at experienced centers ventricular tachycardia ablation carries a minor but significant risk for potential complications, including vascular and thromboembolic complications, air embolism, volume overload and the precipitation of congestive heart failure, cardiac tamponade from catheter perforation or ...
Whitehead William E - - 2007
The authors present a technique in which real-time ultrasound monitoring is used to aid the insertion of cerebrospinal fluid (CSF) shunt ventricular catheters in children without patent fontanelles. Experience with the technique is reviewed. Intraoperative ultrasound is used to identify the compartments of the lateral ventricles and the choroid plexus ...
Li Xiao Kui - - 2007
OBJECTIVE: We have developed an integrated high-resolution intracardiac echocardiography (ICE) catheter for electrophysiology (EP) testing, which can be coregistered in 3-dimensional space with EP testing and ablation catheters using electrofield sensing. METHODS: Twelve open-chest pigs (34-55 kg) and 3 closed-chest pigs were studied. After introduction from the jugular or femoral ...
Bhavani Sekar Sangameswaran - - 2007
Ventricular tachycardia (VT) is most often treated with antiarrhythmic drug therapy. When standard drugs fail, percutaneous, endocardial ablation guided by electroanatomic mapping is usually curative. Occasionally, these options are either unsuccessful or are not feasible, and surgical ablation is required. Surgical ablation of VT employs electroanatomic mapping and a variety ...
Gillinov A Marc - - 2007
Surgical ablation of atrial fibrillation has gained widespread acceptance, particularly in patients having concomitant cardiac surgery. Today, surgeons can choose from a variety of ablation technologies to facilitate operations intended to treat atrial fibrillation. Evidence suggests that virtually all of the available energy sources are effective at creating lines of ...
Voss Frederik - - 2008
BACKGROUND: Once chamber geometry is determined, the EnSite 3000 noncontact mapping system can create a voltage map during a single cardiac cycle. The EnSite uses an inverse solution to the Laplace equation to process the amplified far-field signals from the noncontact catheter. This process creates a three-dimensional endocardial potential map ...
Strohmer Bernhard - - 2007
The authors describe a 22-year-old woman with regular and irregular arrhythmias exhibiting left bundle branch block (LBBB) morphology at various heart rates. An atriofascicular fiber was diagnosed as the underlying mechanism for the antidromic reciprocating tachycardia. In addition, spontaneous automaticity of the Mahaim fiber was present during electrophysiologic study. The ...
Bauernfeind T - - 2007
OBJECTIVES: We aimed to test the maximum voltage-guided cavotricuspid isthmus (CTI) ablation technique during ongoing atrial flutter. BACKGROUND: Former pathological and electrophysiological studies clarified that the cavotricuspid isthmus is composed of distinct muscular bundles, which are responsible for the conduction of electrical activation. Based on this observation, a maximum voltage-guided ...
Kautzner J - - 2007
Intracardiac echocardiography (ICE) broadens the spectrum of echocardiographic techniques. Modern 10F sector echocardiographic catheters introduced into the right atrium allow high quality imaging of all cardiac structures, including pulse and continuous wave Doppler and/or color Doppler. The main indication for ICE appears to be monitoring of catheter ablation of complex ...
Lamberti Filippo - - 2007
Monomorphic premature ventricular contractions (PVCs) are a benign phenomenon in patients without structural heart disease. The focal source is usually localised in the right ventricular outflow tract and more rarely in the left ventricular outflow tract. We report two cases of frequent isolated PVCs treated with radiofrequency catheter ablation. Ventricular ...
Papagiannis John - - 2007
INTRODUCTION: Atrial tachycardias are a common problem following the surgical repair of complex congenital heart defects (CHD) and have a poor response to medication. The aim of this study was to describe the results of the treatment of such tachycardias with radiofrequency ablation in our hospital. METHODS: A retrospective study ...
Cho Yun-Hyeong - - 2007
Entrapment of a guidewire is a rare event, but it could happen especially in severe calcified stenotic lesion. This complication is life-threatening because it can lead to myocardial ischemia, infarction, or lethal arrhythmia due to intracoronary thrombosis. In the event of failed retrieval and persistent signs of ischemia, patients should ...
Broadhurst Paul - - 2007
We report a case of supraventricular tachycardia associated with left bundle branch block due to a slowly conducting right sided accessory pathway. Preexcitation of the ventricles could not be demonstrated during sinus rhythm or incremental atrial pacing but its presence was confirmed during antedromic tachycardia with critically timed atrial extrastimuli. ...
Di Biase Luigi - - 2007
INTRODUCTION: We report the case of a 49-year-old male patient with recurrent palpitations and two different supraventricular reciprocating tachycardias due to atrioventricular (AV) nodal reentry and orthodromic AV reentry sustained by a left-sided, concealed AV accessory pathway (AP). METHODS AND RESULTS: During the baseline electrophysiological study, dual AV nodal conduction ...
Andrew Peter - - 2007
Atrial flutter (AFl), a re-entrant atrial tachycardia, is a cardiac rhythm disturbance that arises in the upper chambers of the heart. This usually non-life-threatening condition can be treated by a number of medical intervention strategies, which include electrical cardioversion, pharmacological therapy, and catheter ablation. These options have been available in ...
Stan H - - 2007
The authors present the management of non-obstructive hydrocephalus using two surgical procedures, both at the same time: first, we perform an endoscopic third ventriculostomy and second, we place the ventricular catheter of the ventriculo-peritoneal shunt in the prepontine cistern under endoscopic guidance. The main rationale is the fact that the ...
Vijayaraman Pugazhendhi - - 2007
BACKGROUND: Atrioventricular nodal reentrant tachycardia (AVNRT) is a common form of supraventricular tachycardia (SVT). Rarely, patients may present with an unusual form of atrioventricular nodal reentrant arrhythmia (AVNRA) with a cycle length greater than 600 ms. We describe the clinical presentation, electrophysiology characteristics, and response to radiofrequency ablation in a ...
Quinn F Russell - - 2008
True nodoventricular (NV) accessory connections, as originally described by Mahaim, are rare entities, with the majority of previously reported cases now recognized as being due to decremental atriofascicular pathways. Here, we present a patient with incessant narrow and wide QRS complex tachycardia occurring in the setting of prior complete heart ...
Ito Sachiko - - 2008
We report a case of a patient with idiopathic right ventricular tachycardia who underwent radiofrequency (RF) catheter ablation. Shortly after the delivery of the RF energy, a nonsustained VT cluster occurred, and eventually resulted in VF, requiring cessation of the RF delivery and a 200 J transthoracic external cardioversion delivery.
Orme R M L'E - - 2007
We present a case of fatal cardiac tamponade that occurred in association with a peripherally inserted central catheter (PICC) inserted from the right antecubital fossa. Migration of the catheter from the right atrium within 24 h of insertion lead to the administration of a potassium-enriched sodium chloride solution into the ...
Zoppo Franco - - 2007
We present a case of a patient treated with catheter ablation for atrial fibrillation aiming to pulmonary veins isolation. During ablation, atrial fibrillation organized into a left atrial flutter. Electroanatomic and electrophysiologic mapping revealed the anterior left atrium area between the mitral annulus and left atrium septum as a critical ...
Lim Kang-Teng - - 2007
The seminal observation that ectopics from the pulmonary veins may initiate paroxysmal atrial fibrillation (AF) heralded an era of potentially curative catheter ablation therapy for AF. In recent years, catheter ablation has been performed for not only paroxysmal but also persistent and permanent AF. It is anticipated that the number ...
Clementy Nicolas - - 2007
Nonreentrant atrioventricular (AV) nodal tachycardia is a rare form of arrhythmia due to simultaneous anterograde conduction in dual AV pathways, one atrial impulse triggering two ventricular complexes. We report the case of a 74-year-old man referred for incessant palpitations resistant to antiarrhythmic medication, and effort dyspnea. A nonreentrant AV nodal ...
Kistler Peter M - - 2007
BACKGROUND: Pharmacological management of arrhythmias is not curative, is sometimes difficult, and may be associated with significant morbidity. OBJECTIVE: This article discusses the place of catheter ablation in the treatment of arrhythmias. DISCUSSION: Supraventricular and typical atrial flutter can be cured with catheter ablation in approximately 95% of cases with ...
Oswald Hanno - - 2007
BACKGROUND: Markers of myocardial injury and inflammation have been shown to be elevated following radiofrequency (RF) ablation. This study aimed to compare RF ablation and cryoablation for their impact on markers for myocardial injury and inflammation. METHODS: Nineteen patients received catheter ablation for atrial flutter by either cryoablation (10 patients) ...
Otsuka Ryo - - 2007
BACKGROUND: High-intensity focused ultrasound (HIFU) produces immediate focal lesions without direct tissue contact. Previously, we reported the HIFU potential for cardiac ablation. The purpose of this study was to evaluate the possibility of myocardial ablation in the left ventricle of beating dog hearts with monitoring by 2-dimensional echocardiography. METHODS: The ...
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