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Results 201 - 250 of 1782
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Udink Ten Cate Floris Ea - - 2010
A subset of children and adults with Wolff-Parkinson-White (WPW) syndrome develop dilated cardiomyopathy (DCM). Although DCM may occur in symptomatic WPW patients with sustained tachyarrhythmias, emerging evidence suggests that significant left ventricular dysfunction may arise in WPW in the absence of incessant tachyarrhythmias. An invariable electrophysiological feature in this non-tachyarrhythmia ...
Tu Chung-Ming - - 2010
The diagnosis of Wolff-Parkinson-White syndrome is typically reserved for patients who experience ventricular pre-excitation and symptoms that are related to paroxysmal supraventricular tachycardia, such as chest pain, dyspnea, dizziness, palpitations, or syncope. Herein, we report the case of a 38-year-old woman who presented at our outpatient department because of exercise ...
Mokabberi Rasoul - - 2010
A 58-year-old female underwent PVC ablation within the right coronary cusp for symptomatic PVCs and suspected PVC-induced cardiomyopathy. Immediately after the procedure, she started to complain about feelings of impending doom, disorientation to time and place, and amnesia regarding the procedure. No sensory or motor deficits could be elicited. A ...
Bortone Agustin - - 2010
We report on an atrial tachycardia (AT), emanating from the non-coronary (NC) aortic cusp, ablated with the aid of an electro-anatomical navigation system. In this setting, the electrocardiographic, electrophysiologic (EP), anatomical, and ablative considerations are discussed.Although NC aortic cusp focal ATs are an uncommon EP finding, their ablation is effective ...
Sehar Nandini - - 2010
After initial documentation of excellent efficacy with radiofrequency ablation, this procedure is being performed increasingly in more complex situations and for more difficult arrhythmia. In these circumstances, an accurate knowledge of the anatomic basis for the ablation procedure will help maintain this efficacy and improve safety. In this review, we ...
Wong Dennis T L - - 2010
A 75-year-old man with history of paroxysmal atrial fibrillation developed acute pulmonary oedema immediately after permanent pacemaker insertion for symptomatic bradycardia and was transferred to our institution. Echocardiography prior to pacemaker insertion showed normal left ventricle (LV) function and mild mitral regurgitation (MR). A single-chamber pacemaker had been inserted with ...
Farré Jerónimo - - 2010
Cardiac anatomy is complex and its understanding is essential for the interventional arrhythmologist. The first difficulty is the terminology used to describe the location of sites of mapping and ablation. For many years, electrophysiologists have named these positions following the conventional electrocardiographical vocabulary, or the terminology used by surgeons performing ...
Abuissa Hussam - - 2010
Ablation for ventricular tachycardia remains a challenge with suboptimal procedural success rates. One of the major causes of difficulty is precipitous hypotension when ventricular tachycardia is induced precluding even rapid mapping of the arrhythmia. We report the successful use of the Impella microcirculatory axial blood flow pump in 3 patients ...
Brembilla-Perrot Beatrice - - 2010
We report the case of a 51-year-old patient who developed a complete atrioventricular (AV) block during the isthmic radiofrequency catheter ablation of a typical atrial flutter. The cause was an acute occlusion of the segment three of the right coronary artery. His recanalization was associated with the immediate restoration of ...
Luik Armin - - 2010
BACKGROUND: Catheter ablation of persistent and long-standing persistent atrial fibrillation (AF) is still challenging. So far different ablation techniques have been reported, including pulmonary vein isolation, additional linear lesions, ablation of complex fractionated atrial electrograms (CFAE), and combinations of these techniques. During ablation of CFAE, the occurrence of left atrial ...
Bulava Alan - - 2010
We report on our experience with complete mitral isthmus conduction block achieved inadvertently during radiofrequency (RF) catheter ablation for a left lateral concealed accessory pathway (AP) mimicking concentric retrograde activation. This rare condition should be acknowledged to avoid misdiagnosis of another concomitant AP and to avoid RF applications in inappropriate ...
Nademanee Koonlawee - - 2010
Cardiologists and physicians have witnessed a significant change in the management of atrial fibrillation (AF): antiarrhythmic agents are no longer considered more effective than just merely using compounds that control ventricular response of the arrhythmia with anticoagulation in high-risk patients. Catheter ablation has grown into wider acceptance as an important ...
Katritsis Demosthenes G - - 2010
A new technique for ablation of persistent ectopic activity with atypical electrocardiographic characteristics at the vicinity of the right ventricular outflow tract is described. A new circular mapping and ablation catheter initially designed for pulmonary vein ablation was used. Abolition of ectopic activity was achieved with minimal fluoroscopy and ablation ...
Maury Philippe - - 2010
Concealed left superior accessory pathways are very infrequent and can be difficult to diagnose and ablate. We describe here the case of a patient presenting with reciprocating tachycardia involving superior and inferior left accessory pathways. Left superior accessory pathway was suspected because of the simultaneous retrograde atrial activation at the ...
Tubbs R Shane - - 2009
OBJECT: Cadavers are often used in the teaching of various neurosurgical procedures. One aspect of this resource that has not been previously explored is the postmortem dilation of the ventricular system, which is often collapsed, for the purpose of training neurosurgeons in the use of intraventricular endoscopy. METHODS: Nine adult ...
Tubbs R Shane - - 2009
OBJECT: Emergency access to the ventricular system is sometimes necessary for the treatment of raised intracranial pressure with ensuing herniation. One procedure described in the literature is a transorbital approach performed using a spinal needle. Because past publications have been case reports with minimal definition of external landmarks, the present ...
Piorkowski Christopher - - 2009
BACKGROUND: In this study, a new method of contact assessment based on the measurement of the local electrical properties at the catheter tip-to-tissue interface was validated in a blinded fashion in vivo in the human left atrium. METHODS: Using a 3-terminal circuit model, local resistance and reactance between catheter tip ...
Ferguson John D JD Department of Medicine, Division of Cardiovascular Medicine, University of Virginia, Charlottesville, VA 22908, USA. - - 2009
Catheter ablation of atrial fibrillation is currently guided by x-ray fluoroscopy. The associated radiation risk to patients and medical staff may be significant. We report an atrial fibrillation ablation technique using intracardiac echocardiography (ICE) and electroanatomic mapping without fluoroscopy. Twenty-one patients with atrial fibrillation (age, 42 to 73 years; 14 ...
McCready James W - - 2010
We report a case of an iatrogenic atrial septal defect following left atrial ablation for persistent atrial fibrillation in a patient with a Fontan circulation. Transseptal puncture was performed with two sheaths across a single puncture and left atrial ablation undertaken. Post procedure the patient became cyanosed with right to ...
Shapira Adam R - - 2009
Supraventricular arrhythmias are relatively common, often persistent, and rarely life-threatening cardiac rhythm disturbances that arise from the sinus node, atrial tissue, or junctional sites between the atria and ventricles. The term "supraventricular arrhythmia" most often is used to refer to supraventricular tachycardias and atrial flutter. The term "supraventricular tachycardia" commonly ...
Steven Daniel - - 2010
BACKGROUND: Catheter ablation procedures for atrial fibrillation (AF) often involve circumferential antral isolation of pulmonary veins (PV). Inability to reliably identify conduction gaps on the ablation line necessitates placing additional lesions within the intended lesion set. OBJECTIVE: This pilot study investigated the relationship between loss of pace capture directly along ...
Toutouzas Konstantinos - - 2011
Alcohol septal ablation is an emerging technique for the reduction of the subaortic gradient in hypertrophic obstructive cardiomyopathy. The selection of the branch to be ablated is not always obvious, however, and the use of Myocardial Contrast Echocardiography assists in the proper localization of the perfusion area of each branch. ...
Habib Ammar - - 2009
Cardiac electrophysiologists' use of the coronary sinus (CS) to map and ablate accessory pathways and implant left ventricular leads has emphasized the need for understanding CS anatomy. In this review, we briefly examine the developmental and radiological anatomy of the CS and discuss in detail the gross anatomy of this ...
Doppalapudi Harish - - 2009
Complications are inherent to any invasive procedure. The list of complications associated with catheter ablation of atrial fibrillation has steadily increased with the increase in complexity and the number of procedures performed over the years. This review focuses on strategies for prevention, and techniques for rapid detection and management of ...
Crawford Thomas - - 2009
Catheter ablation has evolved as an effective treatment modality in patients with AF. In this review, the rationale and outcomes of ablation strategies targeting various mechanisms of AF based on our current understanding are discussed. Likely mechanisms responsible for the therapeutic effects of these approaches are reviewed.
Tai Ching-Tai - - 2009
The cavotricuspid isthmus (CTI) had a complex architecture with an anisotropic conduction property. An incremental pacing from the low right atrial isthmus produced a conduction delay and block, and initiated atrial flutter. Radiofrequency catheter ablation of the CTI was very effective in eliminating the typical atrial flutter. However, atrial fibrillation ...
Sorgente Antonio - - 2010
A 55-year-old man with a 2-year history of recurrent paroxysmal palpitations and with an electrocardiogram documentation of atypical atrioventricular nodal re-entrant tachycardia (AVNRT) was referred to us for catheter ablation. After an initial ablation attempt, several episodes of atypical AVNRT were induced. During one of these episodes, we documented a ...
Abouezzeddine Omar - - 2010
Radiofrequency (RF) ablation for ventricular tachycardia (VT) has high failure rates. Whether endocavitary structures (ECS) such as the papillary muscles (PMs), moderator bands (MBs), or false tendons (FTs) impact VT ablation is unknown. We retrospectively reviewed records of 190 consecutive patients presenting for VT ablation and identified 46 (24%) where ...
Yamada Takumi - - 2010
BACKGROUND: Idiopathic ventricular arrhythmias (VAs) may be amenable to catheter ablation within or adjacent to the left sinus of Valsalva (LSOV). However, features that discriminate these sites have not been defined. The purpose of this study was to determine the electrocardiographic and electrophysiological features of VAs originating within or adjacent ...
Yamada Takumi - - 2009
A 68-year-old man with symptomatic idiopathic premature ventricular contractions (PVCs) underwent electrophysiological testing. Radiofrequency catheter ablation was unsuccessful at the earliest endocardial ventricular activation site in the left coronary cusp. Epicardial mapping via the cardiac veins was then performed. Balloon-occluded coronary sinus venography revealed the small branches of the anterior ...
Yamashina Yoshihiro - - 2010
INTRODUCTION: The precise incidence and characteristics of ventricular arrhythmias originating from the pulmonary artery have not been fully described. The purpose of this prospective study was to clarify these points. METHODS: Thirty-three consecutive patients with an idiopathic left bundle branch block and inferior-axis deviation type ventricular arrhythmia were included. All ...
Yamada Takumi - - 2010
INTRODUCTION: Idiopathic ventricular arrhythmias (VAs) can originate from the left ventricular (LV) papillary muscles (PAMs). This study investigated the prevalence, electrocardiographic and electrophysiological characteristics, and results of catheter ablation of these VAs, and compared them with other LV VAs. METHODS AND RESULTS: We studied 71 patients with VAs originating from ...
Linton Nick W F - - 2009
Mapping of regular cardiac arrhythmias is frequently performed using sequential point-by-point annotation of local activation relative to a fixed timing reference. Assigning a single activation for each electrogram is unreliable for fragmented, continuous, or double potentials. Furthermore, these informative electrogram characteristics are lost when only a single timing point is ...
Bala Rupa - - 2010
INTRODUCTION: Endpoints confirming block in the critical isthmus in sinus rhythm and with pace mapping have not been established. METHODS AND RESULTS: A 44-year-old man with a history of Tetralogy of Fallot presented with recurrent ventricular tachycardia (VT). Entrainment mapping was consistent with a macroreentrant circuit rotating in a clockwise ...
Zhang Fengxiang - - 2009
AIMS: Several electrocardiographic (ECG) algorithms have been developed to identify the site of origin of ventricular premature contractions (VPCs) from right ventricular outflow tract (RVOT) based on pacemapping; however, their accuracy remains unclear. METHODS AND RESULTS: We evaluated the accuracy of these algorithms in 52 consecutive patients (31 female, mean ...
Nordbeck Peter - - 2009
Myocardial scars from heart surgery are a source of tachycardia, eventually causing late morbidity and sudden death. In general, catheter ablation has been shown to be an effective therapy for various rhythm disorders, but it has been rarely described after atrioventricular valve replacement. We report on a 45-year-old man who ...
Jang Sung-Won - - 2009
Posteroseptal accessory pathways are often associated with coronary sinus diverticula. These diverticula contain myocardial coats which serve as a bypass tract. We report a 54-year-old woman who underwent radiofrequency (RF) catheter ablation for Wolff-Parkinson-White (WPW) syndrome. The surface electrocardiography (ECG) demonstrated pre-excitation, indicating a posteroseptal accessory pathway. A catheter ablation ...
Hosaka Yukio - - 2009
Ventricular fibrillation associated with coronary vasospasm developed 8 h after successful radiofrequency (RF) ablation of the right accessory pathway in an 81-year-old male. A segment of the coronary vasospasm was located close to the accessory pathway, where seven RF ablations had been applied. Although rare, physicians should carefully consider the ...
Forleo Giovanni B - - 2011
Atrial tachycardias are relatively common in patients with congenital heart disease. However, complex anomalies involving the heart and the great vessels might compromise the results of the ablation procedure. This report describes a clinical application of the new Cartosound™ module as an adjunctive technology to understand the mechanism of the ...
Takatsuki Seiji - - 2009
BACKGROUND: The coronary sinus (CS) including the great cardiac vein is an important anatomic structure that is considered a landmark for the mitral annulus (MA) and also a target for catheter ablation. OBJECTIVE: This study evaluated the anatomical relationship between the CS and its surrounding structures visualized by multi-detector computed ...
Sarrazin Jean-Francois - - 2009
Frequent idiopathic premature ventricular complexes (PVC) are associated with a reversible form of cardiomyopathy. The effect of frequent PVCs on left ventricular function has not been evaluated in post-infarction patients. This study sought to evaluate the value of post-infarction PVC ablation and possible determinants of a reversible cardiomyopathy. Thirty consecutive ...
Rillig Andreas - - 2009
Whenever common ablation strategies for treatment of cardiac arrhythmias fail, the search for alternative concepts becomes essential. Since it has been proven that the sinus of Valsalva (soV) is situated in close proximity to small regions of the myocardium, difficult to access via endocardial ablation, catheter ablation within the soV ...
Di Biase Luigi - - 2009
INTRODUCTION: Remote magnetic navigation (RMN) has been reported as an effective and safe tool to overcome the need for advanced operator skill in the treatment of complex arrhythmias. We report a series of patients undergoing radiofrequency catheter ablation of ventricular arrhythmias (VAs) using RMN with either a 4-mm catheter tip ...
Di Biase Luigi - - 2010
Uncommon sites of ablation for arrhythmias can be the cause of failed ablations. This series includes 4 cases requiring ablation at the tip of the left atrial appendage after both endocardial and epicardial mapping and ablation failed.
De Filippo Paolo - - 2009
Atrial tachyarhthmias complicating Fontan correction may have a 'malignant' clinical presentation seriously impairing the patient haemodynamic. Current strategies are surgical total cavopulmonary connection with or without antiarrhythmic surgery or transcatheter ablation. We describe the case of a patient who previously underwent atriocaval Fontan correction and later presented with refractory atrial ...
Habib Ammar - - 2010
Calcified amorphous tumors (CAT) of the heart are rare primary cardiac tumors characterized by heavy myocardial and valve apparatus calcification. The relationship of the entity with ventricular arrhythmia, if any, is unknown. We describe a case of cardiac CAT in a 58-year-old woman with prior cardiac arrest and recurrent ventricular ...
Valderrábano Miguel - - 2009
The vein of Marshall (VOM) is a left atrial (LA) vein that contains autonomic innervation and triggers of AF. Its location coincides with areas usually ablated during pulmonary vein (PV) antral isolation (PVAI). This study sought to delineate the safety and ablative effects of ethanol infusion in the VOM during ...
Rausch Peter - - 2009
Catheter ablation of left ventricular outflow tract tachycardia (LVOTT) holds the risk of complications, if foci are located close to the coronary artery orifices. The use of an accurate three-dimensional electro-anatomic approach is necessary to avoid ablation in the coronaries. We report a case in which we demonstrate the value ...
Liang Jin-Jun - - 2009
Radiofrequency catheter ablation (RFCA) has been increasingly used for the treatment of various kinds of cardiac arrhythmias over the past 20 years. RFCA of symptomatic premature ventricular contractions (PVCs) has been reported to be a safe and effective treatment option and may be considered in patients with extremely symptomatic or ...
Nakamura Hirofumi - - 2009
Radiofrequency (RF) catheter ablation is widely applied to tachyarrhythmia associated not only with structurally normal hearts but also with relatively mild cardiac anomalies. We present a case of 35 year-old female complaining of exercise-induced frequent palpitations caused by atrial tachycardia (AT) originating from giant coronary sinus (CS) connected to persistent ...
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