Search Results
Results 251 - 300 of 1872
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Shalganov Tchavdar Nikolov - - 2006
A case of a patient with narrow QRS tachycardia and without structural heart disease is presented. The electrophysiologic study revealed an atrial tachycardia in the presence of dual atrioventricular (AV) nodal physiology and AV block at suprahisian level, the latter two leading to an unusual Wenckebach periodicity. The entire septal ...
Yeo Khung Keong - - 2006
Elevations in serum cardiac troponins are used to diagnose myocardial infarction caused by ischemic heart disease. Several other conditions result in elevated cardiac makers in the absence of significant coronary artery disease. While not commonly recognized elevations of troponin I (TNI) may be seen in patients with protracted arrhythmias. We ...
Reithmann Christopher - - 2006
Simultaneous epicardial and endocardial mapping demonstrated that in a substantial number of ventricular tachycardias (VTs) endocardial, intramural, and epicardial structures are involved in the substrate of the reentrant circuits. Both right and left ventricular breakthrough has also been described during VT originating in the interventricular septum. We report the case ...
Rami Tapan G - - 2006
Cardiac resynchronization therapy is an effective tool for the treatment of drug-refractory heart failure in patients with left ventricular dysfunction and inter/intra ventricular conduction delay. Supraventricular tachycardias may prevent effect delivery of this therapy. We report three cases in which effective therapy was limited by asymptomatic supraventricular tachycardia. Diagnostic pacing ...
Galea Nathalie - - 2006
INTRODUCTION: Repaired tetralogy of Fallot is usually conducive to a normal and unrestricted lifestyle. However, occasionally, late sudden death occurs due to ventricular tachycardia. This is thought to be due to a combination of factors, including both left and right ventricular dilation, which may be associated with valvular incompetence and ...
Ozeke Ozcan - - 2006
Exercise-induced monomorphic ventricular tachycardia originating in the right ventricular outflow tract without evidence of structural heart disease can be idiopathic or can be the harbinger of structural abnormalities such as arrhythmogenic right ventricular dysplasia. Recently, the so-called variant Brugada syndrome has been reported in very few cases in the literature ...
Tsuji Yukiomi - - 2006
BACKGROUND: Sustained heart rate abnormalities produce electrical remodeling and susceptibility to arrhythmia. Uncontrolled tachycardia produces heart failure and ventricular tachyarrhythmia susceptibility, whereas bradycardia promotes spontaneous torsade de pointes (TdP). This study compared arrhythmic phenotypes and molecular electrophysiological remodeling produced by tachycardia versus bradycardia in rabbits. METHODS AND RESULTS: We evaluated ...
Topilski Ian - - 2006
OBJECTIVES: We sought to assess the frequency of spontaneous or inducible atrioventricular nodal reentry tachycardia (AVNRT) in patients referred for radiofrequency ablation (RFA) of idiopathic outflow tract ventricular arrhythmias. BACKGROUND: In patients with no obvious heart disease, AVNRT and outflow tract ventricular tachycardia (VT) are the most frequently encountered supraventricular ...
Scheinman Melvin M - - 2006
We review the clinical and genetic disorders associated with exercise-induced ventricular arrhythmias in patients with normal hearts. Foremost are those with catecholaminergic polymorphic ventricular tachycardia due to abnormalities in either the ryanodine receptor 2 genes (RyR2) or the calsequestrin genes (CASQ). These patients manifest ventricular premature beats and polymorphic ventricular ...
Vijayaraman Pugazhendhi - - 2006
BACKGROUND: The sequence of atrial and ventricular electrograms following termination of ventricular pacing during supraventricular tachycardia has been shown to reliably differentiate atrial tachycardia from atrioventricular nodal reentrant tachycardia (AVNRT) and atrioventricular reentrant tachycardia (AVRT). However in patients with long HV intervals, this may be misleading due to a pseudo ...
Arya A - - 2006
Few reports have described tachycardia-induced cardiomyopathy secondary to ventricular tachycardia. We present a 12-year-old boy with dilated cardiomyopathy and incessant verapamil-sensitive idiopathic left ventricular tachycardia. Twelve-lead electrocardiogram showed right bundle branch block QRS morphology with superior axis during tachycardia. Electrophysiology study confirmed the diagnosis, and radiofrequency ablation was done and ...
Tranquillo Joseph V JV Biomed. Eng. Program, Bucknell Univ., Lewisburg, PA 17837, USA. - - 2006
Attempts to terminate monomorphic tachycardia by rapid pacing occasionally lead to acceleration of the tachycardia rate followed by fibrillation. Previous experimental studies have shown that rapid pacing can convert a single-wave functional reentry into a stable multi-wave reentry with accelerated rate, but only when the single spiral rate is significantly ...
Petrac Dubravko - - 2005
AIM: To evaluate prospectively the impact of atrioventricular (AV) node ablation and consequent pacing therapy on clinical course in patients with permanent atrial fibrillation and unstable ventricular tachycardia induced by rapid ventricular response. METHODS: One hundred four patients with permanent atrial fibrillation and uncontrolled ventricular rate resistant to drug therapy ...
Marill Keith A - - 2006
STUDY OBJECTIVE: It is hypothesized that intravenous (IV) amiodarone is poorly effective for the acute termination of sustained monomorphic ventricular tachycardia because of the relatively slow onset of its Vaughn-Williams class III effect to prolong myocardial depolarization and the refractory period. This study is designed to determine the effectiveness and ...
Yokoshiki Hisashi - - 2006
We report a case of complex supraventricular tachycardia manifested by radiofrequency delivery. Initially, the patient presented with orthodromic atrioventricular reentrant tachycardia via a left-sided accessory pathway that was successfully eliminated. Atrial tachycardia originating from coronary sinus ostium was also induced. Radiofrequency delivery at the coronary sinus ostium induced a narrow ...
Crandell John M - - 2005
A 5-year-old, 29-kg, female Labrador retriever developed tachypnea, tachycardia, and ataxia following ingestion of approximately 48 mg/kg of phenylpropanolamine. Initial diagnostic tests showed multiform ventricular tachycardia, left ventricular dilatation with a focal dyskinetic region in the dorsal interventricular septum, and elevations in creatinine kinase and cardiac troponin I. All abnormalities ...
Schenk S - - 2005
A 68-year-old woman with known proximal myotonic myopathy was transferred to our hospital for further diagnostic and therapeutic evaluation after successful termination of an episode of sustained ventricular tachycardia. In 2001, the myopathy was diagnosed after symptomatic weakness of the hip flexors. A cardiomyopathy with slight reduction of systolic left ...
Atienza Felipe - - 2005
Idiopathic ventricular tachycardia (IVT) in patients without structural heart disease commonly arises from the right or left outflow tracts, but there remain arrhythmias that can only be ablated by an epicardial approach. We report a case of an epicardial ventricular tachycardia originating within the left main coronary artery ostium area, ...
Toal Satish C - - 2005
Cardiomyopathy due to various ventricular and supraventricular arrhythmias, including isolated cases of atypical atrioventricular nodal reentrant tachycardia, have been described. In this case report typical slowfast atrioventricular nodal reentrant tachycardia resulting in cardiomyopathy is being documented for the first time. In the setting of depressed left ventricular function, an episode ...
Hollowell Heather - - 2005
Wide-complex tachycardia (WCT) is defined as a rhythm disturbance with a rate greater than 100 beats/min and a QRS complex duration of 0.12 seconds or more in the adult patient; in the pediatric patient, both rate and QRS complex width are age related. In evaluating this type of tachycardia, there ...
Nazarian Saman - - 2005
Patients with left ventricular dysfunction have an elevated risk of sudden cardiac death. However, the substrate for ventricular arrhythmia in patients with nonischemic cardiomyopathy remains poorly understood. We hypothesized that the distribution of scar identified by MRI is predictive of inducible ventricular tachycardia. Short-axis cine steady-state free-precession and postcontrast inversion-recovery ...
Noda Takashi - - 2005
OBJECTIVES: The aim of this study was to assess the clinical characteristics and the efficacy of radiofrequency catheter ablation (RFCA) for idiopathic ventricular fibrillation (VF) and/or polymorphic ventricular tachycardia initiated by ventricular extrasystoles originating from the right ventricular outflow tract (RVOT). BACKGROUND: Ventricular fibrillation and/or polymorphic ventricular tachycardia are occasionally ...
Jaeggi Edgar T - - 2005
Sustained bradyarrhythmias are typically the result of symptomatic sinus bradycardia, atrial bigeminy or complete atrioventricular (AV) block. Fetal tachyarrhythmias relate to sinus tachycardia, atrial flutter and supraventricular tachycardia as the main aetiology. Ultrasound is essential to understand the underlying arrhythmia mechanism, to study the impact on cardiac function, to exclude ...
Bradbum Christopher - - 2005
Establishing the etiology of tachycardia in a trauma patient is often difficult. Pediatric trauma patients present an even tougher challenge. Cardiac contusion should be suspected when other more common traumatic injuries that produce hypoxia and blood loss are excluded. The diagnosis of cardiac contusion is notoriously difficult to make largely ...
Bae Eun-Jung - - 2005
Radiofrequency catheter ablation (RFCA) has recently become a management option for pediatric tachycardia. We reviewed the records of a total of 100 patients (aged 10 months to 19 yr) who had undergone RFCA, from March 2000 to June 2004. Types of arrhythmia (age, acute success rate) were as follows: atrioventricular ...
Weng Ken-Pen - - 2005
A healthy 15-year-old male patient presented with a 6-month history of recurrent attacks of palpitations. On multiple emergency room visits, a sustained wide QRS complex tachycardia with a right bundle branch block and northwest axis deviation was documented. The tachycardia was not terminated by intravenous adenosine, but was suppressed with ...
Roberts-Thomson Kurt C - - 2005
Atrial tachycardia is an uncommon arrhythmia and may be focal or macroreentrant. This review concentrates on focal atrial tachycardia. Over the last decade there have been a number of advances in delineating the mechanism and anatomic locations of focal atrial tachycardia. The lack of efficacy of antiarrhythmic therapy and the ...
Paraskevaidis Stelios - - 2005
We present a case of inappropriate detection and therapy in a patient with an implantable cardioverter defibrillator. The device interpreted a supraventricular tachycardia as ventricular tachycardia due to unsensed P waves as a result of a relatively high level of atrial sensitivity setting. Subsequently, inappropriate therapy was delivered. The problem ...
Bottoni Nicola - - 2005
The simultaneous occurrence of narrow and wide QRS complex tachycardias was observed in 2 patients evaluated at our electrophysiological centers. Electrophysiological testing revealed the coexistence of two types of arrhythmia (atrioventricular nodal reentrant tachycardia and verapamil-sensitive left ventricular tachycardia) in one patient and of three types of arrhythmia (atrioventricular nodal ...
Hirakubo Y - - 2005
We report a patient with prenatally diagnosed tuberous sclerosis. Fetal ultrasonography demonstrated multiple cardiac tumors and arrhythmia. After birth, because of frequent supraventricular extrasystoles, the infant was admitted to the neonatal intensive care unit. Findings on 24-hour ambulatory electrocardiogram (ECG) showed frequent supraventricular tachycardia and ventricular tachycardia with four beats ...
Nielsen Berit Dalsgaard - - 2005
A single coronary artery was found in a 55-year-old woman undergoing coronary angiography. The left coronary had a normal distribution, with the right coronary originating as a continuation of the distal left circumflex (L-I subtype). The patient had a 5-month history of chest pains of short duration accompanied by a ...
Bloch Thomsen Poul Erik - - 2005
BACKGROUND: Ventricular extrasystoles are characterized by a fixed coupling interval to the last QRST complex preceding it. OBJECTIVES: We hypothesized that this QRST complex differed from QRST complexes of other sinus beats not followed by ventricular extrasystoles. Further, we investigated whether phase 2 reentry, demonstrated in animal experiments to initiate ...
Calò Leonardo - - 2005
Tachycardia-induced cardiomyopathy is a reversible form of heart failure. An early diagnosis and an effective cure of the underlying tachycardia are crucial for a favorable outcome. Different kinds of atrial and ventricular arrhythmias may induce tachycardiomyopathy. Focal atrial tachycardia may be easily suppressed by means of transcatheter ablation. Relationships between ...
Satish Oruganti Sai - - 2005
Ventricular tachycardia originating from the right ventricular septum is very uncommon. In a 54-year-old male patient with right ventricular tachycardia, the focus of the ventricular tachycardia was localized to the subtricuspid septum of the right ventricle, which could be successfully eliminated with radiofrequency catheter ablation. The patient's echocardiogram and coronary ...
Koos R - - 2005
Due to the increasing number of patients and complexity of modern tachycardia devices, efficient therapy surveillance as offered by Home Monitoring (HM) is of increasing importance. We report of an ICD patient with incessant ventricular tachycardia, in whom immediate arrhythmia transmission by HM permitted hospitalization and change of medication without ...
Bhatia Lokpal - - 2005
We report the case of an elderly lady with Parkinson's tremor whose electrocardiographic (ECG) appearance simulated ventricular tachycardia. As a result she underwent unnecessary clinical intervention. We also highlight the difficulty in correctly identifying a tremor-induced ECG artefact with regard to Parkinson's disease, due to the diverse range of possible ...
Cao Kejiang - - 2005
A 30-year-old man presented with narrow QRS tachycardia. The intracardiac electrocardiogram showed an atrial-HIS (AH) interval of 75 msec and a HIS-ventricular (HV) interval of 44 msec during baseline. Atrial incremental pacing revealed HV shortening, with apparent incomplete right bundle branch block (RBBB) morphology without QRS complex axis deviation. The ...
Owada Shingen - - 2005
BACKGROUND: During ventricular extrastimulation, His bundle potential (H) following ventricular (V) and followed by atrial potentials (A), i.e., V-H-A, is observed in the His bundle electrogram when ventriculo-atrial (VA) conduction occurs via the normal conduction system. We examined the diagnostic value of V-H-A for atypical form of atrioventricular nodal reentrant ...
Krasteva Vessela - - 2005
The reliable recognition and adequate electrical shock therapy of life-threatening cardiac states depend on the electrocardiogram (ECG) descriptors which are used by the defibrillator-embedded automatic arrhythmia analysis algorithms. We propose a method for real-time ECG processing and parameter set extraction using band-pass digital filtration and ECG peak detection. Twelve parameters ...
Yamabe Hiroshige - - 2005
We examined the electrophysiologic characteristics and mechanisms of verapamil-sensitive atrial tachycardia (AT) originating from the atrioventricular (AV) annulus in 18 patients. AT originated from the AV node vicinity (AV nodal AT, 10 patients) and the area distant from the AV node (non-AV nodal AT, 8 patients). There was no significant ...
Yusuf Shamil - - 2005
Sinus tachycardia is the most common rhythm disturbance encountered in clinical practice. Primary sinus tachycardia without an underlying secondary cause, despite often being associated with troublesome symptoms, is often neglected leading to multiple consultations and frustration on part of both the practitioner and the patient. The fact that primary sinus ...
Ciaccio Edward J - - 2005
BACKGROUND: Successful prediction of reentrant ventricular tachycardia duration and form from sinus-rhythm electrogram signals in canine hearts is relevant to clinical studies, to potentially improve catheter ablation treatment during EP study. METHODS/RESULTS: Following LAD ligation of canine hearts, activation maps were constructed from 312 border zone sites 4-5 days postinfarction. ...
Dong Jun - - 2005
BACKGROUND: Experience in catheter ablation of left atrial (LA) focal tachycardia and information about interatrial electrical connections during LA focal tachycardia are limited. OBJECTIVES: The purpose of this study was to describe our experience in electroanatomic mapping-guided catheter ablation of LA focal tachycardia and to investigate interatrial electrical connections during ...
Ridley Daryl P - - 2005
BACKGROUND: Inappropriate shocks from implantable cardioverter defibrillators (ICD) remain a significant clinical problem despite device discrimination algorithms. The atrial response to antitachycardia pacing (ATP) may determine the mechanism of 1:1 A:V tachycardia. METHODS: For this study we refer to sinus tachycardia, atrial tachycardia (AT), atrial fibrillation, and flutter as atrial ...
Ciaccio Edward J - - 2005
BACKGROUND: During electrophysiologic study, induction and mapping of clinical reentrant ventricular tachycardia can be difficult. Hence, analysis of sinus-rhythm electrograms for reentry localization is of potential clinical relevance. Herein is described a method of sinus-rhythm electrogram shape analysis, that does not require arbitrary threshold values, for localization of double-loop reentrant ...
Boulos Monther - - 2005
Differentiation between the different right ventricular rhythm disorders and specifically between arrhythmogenic right ventricular dysplasia (ARVD) and right ventricular outflow tract (RVOT) tachycardias has important clinical implications but remains a clinical challenge. We tested the hypothesis that the spatial association of local electrographic parameters may be used to discriminate between ...
Zacharias Joseph - - 2005
OBJECTIVE: Right ventricular disarticulation (RVD) is an accepted procedure in the treatment of ventricular tachycardia of right ventricular origin. We set out to review the long-term outcomes with RVD at our institution for patients with arrhythmogenic right ventricular dysplasia (ARVD) or refractory tachycardia. A renewed interest in this operation has ...
Yeh Yung-Hsin - - 2005
Idiopathic left ventricular tachycardia (ILVT) is a distinct entity that arises in the left ventricle, may have reentrant mechanism and is verapamil-sensitive. Pleomorphism as defined by multiple ventricular tachycardia morphologies is usually associated with either coronary artery disease or cardiomyopathy but very rare in cases of ILVT. In this case ...
Matsuoka Koji - - 2005
A 71-year-old male was referred to another hospital for dizziness. A bradycardia -tachycardia syndrome and Cor triatriatum were detected, and an operation to resect the membrane in the left atrium and implant a pacemaker epicardially was performed. However, no suitable site could be found on either atria and therefore, a ...
Jongbloed M R M - - 2005
Atriofascicular accessory bundles with AV-node like conduction properties can sustain atrioventricular (AV) re-entrant tachycardia (Mahaim tachycardia). During early embryogenesis, the AV canal is situated above the primitive left ventricle (LV), and a right AV connection has not been achieved yet. We studied the formation of the right ventricular (RV) inflow ...
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