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Reddy Vivek Y - - 2003
INTRODUCTION: Para-Hisian pacing during sinus rhythm can help to identify the presence of an accessory pathway (AP). In this maneuver, the retrograde activation time and pattern are compared during capture and loss-of-capture of the His bundle while pacing from a para-Hisian position. However, identification of a retrograde AP does not ...
Izawa Atsushi - - 2003
A 67-year-old man was transferred to hospital because of acute circulatory failure resulting from sustained left ventricular tachycardia (LVT) and dysfunction. Transthoracic echocardiography revealed severely impaired left ventricular contraction and dyskinesis of the apical wall. Neither anti-arrhythmic agents nor direct current cardioversion was effective; the patient was resuscitated by immediate ...
Reek Sven - - 2003
Treatment of ventricular tachyarrhythmias in the setting of chronic myocardial infarction requires accurate characterization of the arrhythmia substrate. New mapping technologies have been developed that facilitate identification and ablation of critical areas even in rapid, hemodynamically unstable ventricular tachycardia. A noncontact mapping system was used to analyze induced ventricular tachycardia ...
O-uchi Jin - - 2003
We thoroughly examined a 26-year-old Japanese male who experienced perioperative ventricular tachycardia. After inhaling sevoflurane, his nasal cavity was soaked with 1:100,000 epinephrine and he was intubated through the nose. Junctional tachycardia occurred five minutes after intubation, changing to ventricular tachycardia. Six-time cardioversion was required to stop the ventricular tachycardia. ...
Ferreira Alexandre Cesar - - 2003
Arrhythmogenic right ventricular dysplasia (ARVD) is a form of cardiomyopathy characterized by fibrofatty infiltration of the right ventricle that leads to cardiac arrhythmias, usually sustained ventricular tachycardia or ventricular fibrillation. ARVD typically becomes recognized in young adults. The authors report a case of an octogenarian in whom third-degree atrioventricular block, ...
Schrepfer Sonja - - 2003
We report the case of a 31-year-old woman with a 4-year history of recurrent palpitations, presenting with an increased frequency of paroxysms caused by ventricular tachycardias during pregnancy. A cardiac tumor of unknown origin infiltrating the right ventricle was diagnosed. Three weeks after prophylactic abrasion the tumor was totally excised ...
Hudson Korin B - - 2003
Ventricular tachycardia is a serious rhythm disturbance that originates from any part of the myocardium or conduction system below the atrioventricular node. Ventricular tachycardia (VT) presents with a wide QRS complex and a rate greater than 120 beats/min. Ventricular tachycardia is frequently encountered as a complication of coronary artery disease ...
Prystowsky Eric N - - 2003
The aim of this study was to evaluate tecadenoson safety and efficacy during conversion of paroxysmal supraventricular tachycardia (PSVT) to sinus rhythm. Tecadenoson (CVT-510), a novel adenosine receptor (Ado R) agonist, selectively activates the A1 Ado R and prolongs atrioventricular (AV) nodal conduction at doses lower than those required to ...
Wellens Hein J J - - 2003
The introduction of programmed electrical stimulation of the heart and intracardiac activation mapping 35 years ago made it possible to study the site of origin or pathway of a supraventricular tachycardia and to gain insight into the tachycardic mechanism. Information from these studies has been the basis for the development ...
Wang Jiaan-Der - - 2003
Idiopathic ventricular tachycardia is rare, especially in infants. We report here on an 8 month-old female infant who presented with tachycardia with a heart rate of 186 beats/ min. An electrocardiogram showed a right bundle branch block pattern, a QRS duration of 80 msec, a superior QRS axis, atrioventricular dissociation, ...
Donoghue Mary - - 2003
Angiotensin converting enzyme related carboxypeptidase (ACE2) is a recently discovered homolog of angiotensin converting enzyme with tissue-restricted expression, including heart, and the capacity to cleave angiotensin peptides. We tested the hypothesis that cardiac ACE2 activity contributes to features of ventricular remodeling associated with the renin-angiotensin system by generating transgenic mice ...
Evans Sally A - - 2003
INTRODUCTION: In 1997 an autopsy on a professional pilot killed in an aircraft accident demonstrated myocardial fibrosis, thought to be the result of previous anthracycline treatment. The United Kingdom (UK) Civil Aviation Authority (CAA) was tasked with investigating the possible dangers to flight safety of treatment with this type of ...
Wellens Hein J J - - 2003
The introduction of programmed electrical stimulation of the heart and intracardiac activation mapping 35 years ago made it possible to study the site of origin or the pathway of a supraventricular tachycardia and to obtain insight into the mechanism of the tachycardia. Information from these studies has been the basis ...
Rezkalla Shereif H - - 2003
A 34-year-old man reported heart fluttering and near syncope a few hours after marijuana smoking. In the emergency department, he was found to have a right bundle-branch-type ventricular tachycardia. The patient underwent a successful electric cardioversion. Coronary angiography showed no pericardial artery stenosis yet very slow coronary blood flow. Clinical ...
Pinto Duane S - - 2003
BACKGROUND: The emergency department diagnosis of sinus versus nonsinus tachycardia is an important clinical challenge. The objective of this study was to identify subjects with a high prevalence of nonsinus tachycardia. METHODS: Heart rate and cardiac rhythm were prospective reviewed in 500 consecutive patients with heart rate > or = ...
Cleary-Goldman J - - 2003
Verapamil-sensitive idiopathic left ventricular tachycardia is a rare diagnosis. A 31-year-old multiparous woman presented with shortness of breath, palpitations and new-onset, wide complex tachycardia at approximately 28 weeks' gestation. Multiple antiarrhythmic agents were administered without resolution of the arrhythmia. Verapamil-sensitive idiopathic left ventricular tachycardia was diagnosed on the basis of ...
Sahara Makoto - - 2003
A patient with 3-vessel coronary artery disease and left ventricular aneurysm underwent coronary artery bypass grafting combined with the Dor approach. Five days later, ventricular tachycardia following short-coupled ventricular premature contractions suddenly occurred and was not responsive to class IB drugs (lidocaine and mexiletine), requiring frequent electrical cardioversion. After the ...
Kertesz N J - - 2003
BACKGROUND: Arrhythmias in adult orthotopic heart transplant (OHT) recipients are common and have been used as predictors of rejection. Because of the paucity of information in pediatric OHT recipients, the purpose of this study was to determine the incidence and correlation of arrhythmias with rejection or with coronary artery disease ...
Feillet F - - 2003
We report the case of a 33-year-old man who presented with headaches and vomiting. Soon after admission he became drowsy and agitated, developed ventricular tachycardia and his neurological state worsened (Glasgow coma score 6). Blood analysis showed respiratory alkalosis, hyperlactacidemia (8 mmol/l), hyperammonemia (390 micro mol/l) and hypoglycaemia (2.4 mmol/l). ...
Tanner M A - - 2003
A 31-year-old white man was referred for investigation of a persistent sinus tachycardia. His only significant past medical history was of chronic schizophrenia for which he had been taking clozapine for six years. An electrocardiogram demonstrated sinus tachycardia, voltage criteria for left ventricular hypertrophy, and a prolonged QTc. Echocardiographic findings ...
Gorenek Bulent - - 2003
At least 2 distinct patterns of sustained monomorphic ventricular tachycardia (MVT) have been ascribed during analysis of stored intracardiac electrograms retrieved from implantable cardioverter defibrillators and Holter recordings in patients with ventricular arrhythmia. We aimed to investigate the electrophysiological features of MVT with different initiation patterns in patients with implantable ...
Janse Michiel J - - 2003
Mechanical stimuli delivered to the precordium can, if strong enough and timed at the beginning of the T-wave, induce ventricular premature beats or runs of ventricular tachycardia and even fibrillation. On the other hand, there are reports that a properly timed "chest thump" can terminate ventricular tachycardia, or can act ...
Jaeggi Edgar T - - 2003
The value of the electrocardiogram (ECG) in children with supraventricular tachycardia (SVT) is unclear. The noninvasive differentiation of typical atrioventricular node reentrant tachycardia (AVNRT) and atrioventricular reciprocating tachycardia (AVRT) mediated by concealed accessory pathway conduction is clinically important, as it helps in counseling and potentially facilitates ablation procedures. One hundred ...
Hélie François - - 2003
During the transition from a slow to rapid depolarization rhythm, rate-dependent sodium channel blockade develops progressively and increases from beat to beat under procainamide but more abruptly under lidocaine. We investigated the consequences of such differences on the dynamic course and stability of reentrant tachycardias at their onset. Procainamide and ...
Tsui K L - - 2003
Isolated ventricular non-compaction is a rare congenital cardiomyopathy, manifested morphologically as prominent myocardial trabeculations and deep inter-trabecular recesses that communicate with the ventricular cavity. Heart failure is the most common presenting condition. Other manifestations include arrhythmia and cardioembolic events. This report is illustrative of isolated ventricular non-compaction in a 78-year-old ...
Bostan Ozlem M - - 2003
Ventricular tachycardia is rare in children. In the absence of structural heart disease, ventricular tachycardia is known as idiopathic ventricular tachycardia and carries a good prognosis. We report a 14-month-old male child with right bundle branch block incessant ventricular tachycardia without structural heart disease. In this patient ventricular tachycardia was ...
Nelson James A - - 2003
Tachycardia with a wide QRS complex is usually due to ventricular tachycardia (VT), supraventricular tachycardia (SVT) with aberrant intraventricular conduction, or an accessory pathway-mediated dysrhythmia. The most common type of accessory pathway causing a wide complex tachycardia is the atrioventricular bypass tract. Distinguishing the accessory pathway-mediated tachycardia from VT or ...
Patterson Eugene - - 2003
OBJECTIVE: The anatomic and electrophysiologic bases for multiple forms of sustained AV nodal tachycardia were determined in the rabbit. METHODS: Intracellular microelectrode recordings were used to identify antegrade and retrograde conduction limbs of sustained tachycardias observed in 23 of 152 superfused rabbit AV junctions. RESULTS: Slow:slow tachycardias (196 +/- 12 ...
Akashi Yoshihiro J - - 2003
A 67-year-old female with recurrent syncope and no obvious heart disease developed ventricular dysfunction, known as takotsubo cardiomyopathy, following a 90 s episode of polymorphic ventricular tachycardia originating from a ventricular extrasystole with a short coupling interval. Cardiac catheterization performed 30 min after the arrhythmic event revealed angiographically normal coronary ...
Carceles M D - - 2003
BACKGROUND AND OBJECTIVE: This study was designed to compare the haemodynamic, electrophysiological and pharmacodynamic effects of three selective inhibitors of the different isoenzyme forms of phosphodiesterase (PDE) on ischaemia-induced dysrhythmias in the anaesthetized rat. The drugs used were pimobendan, a selective PDE III inhibitor, rolipram, a selective PDE IV inhibitor, ...
Yamashiro Satoshi - - 2003
A 60-year-old woman without any risk factors for coronary artery disease presented with symptomatic, recurrent, non-sustained ventricular tachycardia. She was found to have a postero-lateral left ventricular aneurysm. Coronary angiography revealed normal coronary arteries. The 12-lead electrocardiogram showed sinus rhythm with frequent premature ventricular contraction. Her non-sustained ventricular tachycardia was ...
Sharada K - - 2003
Supraventricular tachycardias (SVTs) present as recurrent palpitations. Unlike ventricular tachycardias, these arrhythmias usually carry a benign prognosis. It is important to exclude structural heart disease in these patients. Though vagal manoeuvres and drug therapy are useful for acute termination of SVTs, recurrences are common. Catheter ablation is safe, highly effective ...
Börjesson M A - - 2003
The following case illustrates several important features: firstly, the occurrence of tachycardia-induced cardiomyopathy during sustained atrial tachycardia at a relatively modest heart rate of 130 beats per minute, in an elite athlete. Secondly, tachycardia may induce severe and occasionally life-threatening impairment of the systolic ventricular function without a history of ...
Serés Luis - - 2003
A 57-year-old woman with syncope was admitted. She had a family history of sudden death: two brothers had died suddenly at the age of 47. Transesophageal echocardiography showed numerous prominent trabeculations and deep intertrabecular recesses in the anterior and lateroapical zones. Isotopic left ventricular ejection fraction was 46%. Cardiac catheterization ...
Slovis Corey M - - 2003
Arrhythmias are commonly encountered by emergency medical services (EMS) personnel. The potential seriousness of acute symptomatic arrhythmias necessitates thorough up-to-date training of EMS personnel. The three most common acute tachyarrhythmias, not linked to cardiac arrest, that are observed outside the hospital are paroxysmal supraventricular tachycardia (PSVT), atrial fibrillation with rapid ...
Boriani Giuseppe - - 2003
Morphology Discrimination is a discriminator based on QRS morphology analysis that has been recently implemented in dual chamber implantable cardioverter defibrillators (ICDs). Detected events are initially classified according to median atrial and ventricular rates (Rate Branch). Then, a series of discriminators (Morphology Discrimination, Stability, Sudden Onset) analyze the rhythm according ...
Umana Ernesto - - 2003
Systolic dysfunction associated with chronic tachyarrhythmias, known as tachycardia-induced cardiomyopathy, is a reversible form of heart failure characterized by left ventricular dilatation that is usually reversible once the tachyarrhythmia is controlled. Its development is related to both atrial and ventricular arrhythmias. The diagnosis is usually made following observation of a ...
Ciaccio Edward J - - 2002
During clinical electrophysiological study for treatment of reentrant ventricular tachycardia, activation maps constructed from the acquired electrophysiological data can be difficult to interpret when the reentrant circuit is changing from one cardiac cycle to the next. Reduction of complexity would be beneficial but has been difficult. A new technical method ...
Uchida Fumiya - - 2002
A 39-year-old Japanese woman presented with an idiopathic left ventricular aneurysm manifesting as recurrent episodes of palpitation. She was referred to our hospital for evaluation of sustained ventricular tachycardia. Echocardiography disclosed a dyskinetic well-defined wall bulge during both systole and diastole at the basal region of the interventricular septum, and ...
Shen Win-Kuang - - 2002
Inappropriate sinus tachycardia is an ill-defined clinical syndrome with diverse clinical manifestations. Clinical symptoms can range from intermittent palpitations to multisystem complaints. Although there is a general consensus that when the heartbeat exceeds 100 beats per minute at rest or with minimal physiologic challenge, it is considered "inappropriate," this quantitative ...
Iwai Sei - - 2002
BACKGROUND: We previously proposed that adenosine has mechanism-specific effects on atrial tachycardia (AT), such that adenosine terminates AT attributable to triggered activity, transiently suppresses automatic rhythms, and has no effect on macroreentrant AT. This, however, remains controversial, because other studies have reported that adenosine terminates reentrant AT. To clarify this ...
O'Donnell D - - 2002
OBJECTIVES: This report presents the largest consecutive series to date of radiofrequency ablation in the treatment of post infarction ventricular tachycardia. METHODS: One hundred and twelve consecutive patients were studied, with an average of 12 documented episodes of ventricular tachycardia in the month preceding the radiofrequency ablation. Seventy-four percent of ...
Harris Jean - - 2002
Cardiac arrhythmias are a well known cause of mortality for patients with heart disease. However, sinus tachycardia is a more unusual arrhythmia which can lead to serious heart damage or death. Even young patients with structurally normal hearts may become gravely ill. This case study outlines the condition of sinus ...
Link Mark S - - 2002
INTRODUCTION: Ventricular fibrillation and ventricular flutter (cycle length < or = 230 msec) induced at electrophysiologic studies are thought to be nonspecific findings in patients presenting with syncope of unknown origin. However, there are limited data on the prognosis of these patients in long-term follow-up. METHODS AND RESULTS: We followed ...
Ohkusu Yasuo - - 2002
We investigated whether anti-tachycardia therapy might improve the altered cardiac adrenergic and systolic function in tachycardia-induced cardiomyopathy (TC) in contrast to dilated cardiomyopathy (DCM). The subjects were 23 patients with heart failure, consisting of 8 patients with TC (43.6 +/- 10.0 yrs) and 15 with DCM (45.3 +/- 8.2 yrs). ...
Pellizzón Oscar A - - 2002
BACKGROUND: Sudden cardiac death is a major cause of mortality in western countries and the ventricular tachyarrhythmias are mainly involved in this regard. The adrenergic autonomic nervous system has influences in provoking life-threatening arrhythmias, and the prevention of such arrhythmias with beta-blockers supports this viewpoint. To evaluate the effect of ...
Wen Ming-Shien - - 2002
A low frequency slow potential preceding the Purkinje spike was recorded at the midseptum during tachycardia in a 69-year-old man with verapamil-sensitive left ventricular tachycardia. This potential was characteristically absent during sinus rhythm before radiofrequency ablation, but became evident following the QRS complex after successful ablation at the tachycardia exit ...
Ciaccio Edward J - - 2002
It was hypothesized that quantitative sinus rhythm electrogram measurements could be used to predict conduction events that result from premature stimulation and reentrant ventricular tachycardia inducibility. Sinus rhythm activation and electrogram-duration maps were constructed from bipolar electrograms acquired at 196-312 sites in the epicardial border zone of 43 canine hearts ...
Storey James - - 2002
Idiopathic left ventricular outflow tract (LVOT) tachycardia has been shown to originate from a supravalvular site in some patients. Considerable attention recently has focused on identifying this variant of LVOT tachycardia on 12-lead ECG. We report the case of 15-year-old boy in whom a noncontact three-dimensional mapping electrode deployed in ...
Vlay Stephen C - - 2002
Nonsustained ventricular tachycardia was the initial and only clinical manifestation of myocardial ischemia in a 64-year-old woman evaluated for new onset palpitations. There was no ECG or echocardiographic evidence of ischemia but emergent coronary angiography revealed critical lesions. After angioplasty and stenting of the right coronary artery, ventricular ectopy disappeared. ...
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