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Results 301 - 350 of 1280
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Alegret J M - - 2001
INTRODUCTION: There is scant information about the effects of thrombolysis in the evolution of right bundle-branch block (RBBB) in the setting of acute anterior myocardial infarction. The aim of this study has been to analyse these effects and its impact on prognosis. METHODS: We studied 54 patients who presented a ...
Coghlan H C - - 2001
The study of the dissemination of the electric impulse throughout the ventricular myocardium, which gave rise to the current theories, was performed without taking into consideration the complex architecture of the cardiac muscle elucidated by more recent researchers. We propose a novel hypothesis based on the special macroscopic structure of ...
Nguyen N - - 2001
A variety of atrial and ventricular arrhythmias are encountered in patients with acute coronary syndromes. These include both brady and tachyarrhythmias of supraventricular and ventricular origin. Sinus bradycardia and atrial fibrillation are the most common of supraventricular origin. Ventricular arrhythmias that merit consideration include premature ventricular complexes, accelerated idioventricular rhythm, ...
Dudek D - - 2001
BACKGROUND: Deterioration of left ventricular function during follow-up was reported in some patients with syndrome X and concomitant left bundle branch block. The patients with syndrome X and left bundle branch block has been frequently presented with elevated Endothelin-1 (ET-1) level while brain natriuretic peptide (BNP) (a sensitive marker of ...
Neri G - - 2001
The effects of biventricular pacing on myocardial wall function are well known, but, at the moment, its real effects on myocardial metabolism are unclear. In patients affected by left bundle branch block, at positron emission tomography a septal defect of the uptake of 18F-fluorodeoxyglucose (FDG) was referred. There were no ...
Pudil R - - 2001
Complete right and left bundle branch block and advanced atrioventricular block present on admission electrocardiograms of patients with acute myocardial infarction, are associated with poor short and long-term outcome. Little is known about the impact of intermediate QRS prolongation (0.09-0.11 s) on the prognosis of acute myocardial infarction. In this ...
Chiladakis J A - - 2001
Dysrhythmic causes of syncope may elude diagnosis in postinfarction patients despite elaborate testing, including electrophysiologic study. For a correct diagnosis, capture of cardiac rhythm during patient's typical symptoms is crucial. This report describes a patient with coronary artery disease and decreased left ventricular ejection fraction who experienced recurrent syncopal episodes ...
Melgarejo-Moreno A - - 2001
BACKGROUND: The presence of bundle-branch block (BBB) is associated with high mortality rates and is considered an important predictor of poor outcome in patients with acute myocardial infarction (AMI). HYPOTHESIS: The objective of this study was to assess the prognostic significance of BBB in patients with AMI depending on its ...
Barold S S - - 2001
2:1 AV block can occur in either the AV node or the His-Purkinje system and cannot be classified into type I or type II second-degree AV block because there is only one PR interval to examine before the blocked P wave. It is inappropriate to use terms such as 2:1 ...
Bauer A - - 2001
BACKGROUND: Structural complexities of the intact ventricular wall cause a very complex spread of activation. The effects of regional tissue damage and of antiarrhythmic drugs on directional differences in activation should help to further elucidate intramural conduction patterns. METHODS AND RESULTS: In 10 healthy dogs and in 5 dogs with ...
Gunnarsson G - - 2001
BACKGROUND: The diagnosis of acute myocardial infarction in the presence of left bundle branch block is difficult. Recently a diagnostic ECG scoring system was suggested, showing good diagnostic abilities. This scoring system has never been tested in a prospective manner; we have done so and investigated if it might bear ...
Franco D - - 2001
OBJECTIVES: Within the adult heart, it is convention to distinguish the conduction system and working (atrial and ventricular) myocardium. The adult conduction system (CS) comprises the sinoatrial (SAN), and atrioventricular (AVN) nodes, the atrioventricular bundle (AVB), the bundle branches and the peripheral Purkinje fibers, each of which display distinct functional ...
Yoshida H - - 2001
We report a case of fetal congenital heart block treated with maternal administration of beta-sympathomimetics. The case was diagnosed as fetal complete heart block associated with maternal anti-Ro/SS-A antibody at 22 weeks of gestation. By fetal sonography, the ventricular rate was revealed to be 60 beats/min and mild cardiomegaly was ...
Kucera J P - - 2001
Under physiological conditions, slow conduction is essential for the function of the atrioventricular (AV) node, whereas, under pathophysiological conditions, slow conduction contributes importantly to the generation of life-threatening reentrant arrhythmias. This article addresses characteristics of slow conduction at the cellular network level during (a) a reduction of excitability, (b) a ...
Ishikawa T - - 2001
It has been reported that cardiac function can be improved by implanting a DDD pacemaker (PM) and setting a short atrioventricular (AV) delay in patients with impaired cardiac function. A previous report found that the critical AV delay that induces diastolic mitral regurgitation (MR) may represent the upper limit of ...
Barold S S SS Electrophysiology Institute, Broward General Hospital, Ft Lauderdale, Fla., USA. - - 2001
In this review, we discuss the various forms and causes of second-degree atrioventricular (AV) block and the reasons they remain poorly understood. Both type I and type II block characterize block of a single sinus P wave. Type I block describes visible, differing, and generally decremental AV conduction. Type II ...
Villacastin J - - 2000
BACKGROUND: RS morphology of the unipolar electrogram is associated with propagation of the wave front through the exploring electrode, whereas positive uniphasic (R) unipolar electrograms are characteristic of the end of activation. METHODS AND RESULTS: Unipolar electrograms were recorded in 45 consecutive patients with atrial flutter who were undergoing radiofrequency ...
Gunnarsson G - - 2000
OBJECTIVE: To study early diagnosis, treatment and outcome in patients with bundle branch block and clinically suspected acute myocardial infarction. DESIGN: A prospective multicenter study including 14 Swedish coronary care units. The study included 257 consecutive patients with bundle branch block and clinical suspicion of acute myocardial infarction. RESULTS: Left ...
Laurin E G - - 2000
OBJECTIVE: To compare rocuronium and succinylcholine for rapid-sequence intubation (RSI) in the emergency department (ED). METHODS: A one-year prospective cohort comparison study was performed using a data collection form completed at the time of intubation. Data collected included the reason for the neuromuscular-blocking agent (NMBA) chosen, the time to onset ...
Isotalo P A - - 2000
Systemic metastatic calcification is a common complication of chronic renal failure. Cardiac involvement is particularly ominous, especially when the cardiac conduction system is affected. Conduction defects, arrhythmias, and sudden death have all been reported with conduction system calcification; however, these are relatively under-reported or unrecognized causes of cardiac morbidity and ...
Auricchio A - - 2000
Ventricular dysfunction is a hallmark of heart failure, and is often linked to ventricular dilatation and ventricular conduction delays. Recent studies have demonstrated that systolic function can be improved in patients with left bundle branch block by pre-exciting the site of late activation, usually the left ventricular free wall. Furthermore, ...
Adhiyaman V - - 2000
A 68-year-old woman presented with active rheumatoid arthritis (RA) and severe extra-articular manifestations. During the course of her treatment, her electrocardiogram (ECG) transformed from normal sinus rhythm to left bundle branch block and finally to complete heart block (CHB). Investigations ruled out an ischaemic event. A permanent pacemaker was inserted ...
Ortega-Carnicer J - - 2000
A concept generally accepted in clinical electrocardiography is the assumption that a right bundle branch block (RBBB) does not alter significantly the initial portion of the QRS complex and because the left bundle branch is intact, the septum is activated normally in a left-to-right direction. We report a woman with ...
Bõhm A - - 2000
A 57-year-old female was implanted with a Biotronik Pikos VVI pulse generator. During her follow-up period right bundle-branch block was observed. Therefore further posteroanterior and lateral chest X-ray and echocardiography were performed. Only the transoesophageal echocardiography showed exactly the abnormal pathway of the electrode through the foramen ovale apertum to ...
Itoh H - - 2000
Two women with myotonic dystrophy underwent dipyridamole thallium-201 (201Tl) myocardial perfusion imaging, after which one patient developed flat T waves in lead I and aV(L), and inverted T waves in leads V(2-6). The other patient developed a nonspecific intraventricular block that progressed to complete left bundle branch block and was ...
Di Lisi R - - 2000
During early cardiac development the atrial myocardium is continuous with the ventricular myocardium throughout the atrioventricular canal. The atrioventricular canal undergoes complex remodelling involving septation, formation of atrioventricular valves and insulation between atria and ventricles except at the level of the atrioventricular node. Understanding of these processes has been hampered ...
Ohno T - - 2000
The authors report a patient of pure apraxic agraphia with normal praxis due to left thalamic infarction. 15O-gas-PET showed reduced oxygen metabolism in the left thalamus and the left dorsolateral premotor area, while MRI and 11C-fulumazenil-PET showed no remarkable lesions in the frontal cortex. The patient's word imaging remained normal. ...
Upshaw C B CB - - 2000
Using an isolated frog heart preparation with ligatures around the atria, Luigi Luciani, an Italian physiologist working in 1873 in Carl Ludwig's famous laboratory in Leipzig, was the first to demonstrate cardiac group beating, which he named periodic rhythm. He attributed this to increased resistance to impulse propagation between the ...
Niu W Z - - 2000
The purpose of this study was to examine the effects of calcitonin gene-related peptide (CGRP) on coronary flow and various parts of cardiac conduction system (CCS) in the isolated guinea pig heart by recording the cardiac electrogram and His bundle activity simultaneously. The coronary flow (CF) was measured and the ...
Arce Humberto - - 2000
Life-threatening arrhythmias such as ventricular tachycardia and fibrillation often occur during acute myocardial ischemia. During the first few minutes following coronary occlusion, there is a gradual rise in the extracellular concentration of potassium ions ([K(+)](0)) within ischemic tissue. This elevation of [K(+)](0) is one of the main causes of the ...
Kaneko Y - - 2000
We report the case of a patient with bundle branch reentrant ventricular tachycardia having two distinct components of the QRS complex due to simultaneous dual transseptal conduction. The macroreentrant circuit consisted of anterograde conduction down the left bundle branch and retrograde conduction up the right bundle branch. Extensively injured myocardium ...
Sarter B H - - 2000
Isthmus conduction block, demonstrated with the use of multipolar catheter recordings, is considered the preferred endpoint for ablation of type I atrial flutter. This study investigated the feasibility of using recordings from the His and coronary sinus (CS) to document isthmus conduction block. Isthmus conduction block was produced with linear ...
Ho S Y - - 2000
OBJECTIVE: To review the anatomical structure of the right atrioventricular junction, including the specialised atrioventricular conduction system, in hearts with Ebstein's malformation, to identify potential substrates for the abnormalities in conduction. METHODS: Five heart specimens representing the morphological spectrum of Ebstein malformation were examined grossly and histologically. RESULTS: On the ...
Horváth Z - - 2000
Primary intraventricular hematomas account for approximately 6% of all intracerebral hematomas. If the clot blocks cerebrospinal fluid (CSF) pathways, surgical intervention, which may be of different types, can be life-saving. In the case reported here, after careful preoperative planning the use of two rigid endoscopes permitted the removal of most ...
Shimoike E - - 2000
Idiopathic left ventricular (LV) tachycardia usually exhibits right bundle branch block morphology. There are only a few sporadic cases that exhibit left bundle branch block (LBBB) morphology. We report a patient whose QRS complex during ventricular tachycardia (VT) was relatively narrow (100 msec) and exhibited LBBB (precordial R wave transition ...
Brady W J - - 2000
The 12-lead electrocardiogram (EKG), a powerful tool used in evaluating the chest pain patient, has its shortcomings. One such failing is encountered in a patient with one of the following electrocardiographic patterns: left bundle branch block (LBBB), ventricular paced rhythm (VPR), and left ventricular hypertrophy (LVH). These patterns reduce the ...
Smith N P - - 2000
A discrete anatomically accurate finite element model of the largest six generations of the coronary arterial network is developed. Using a previously developed anatomically accurate model of ventricular geometry the boundaries of the coronary mesh are defined from measured epicardial coronaries. Network topology is then generated stochastically from published anatomical ...
Goadsby P J - - 1999
The pharmacotherapy of migraine has advanced in parallel with our understanding of the pathophysiology of the disease. It is likely that it is the gap in our knowledge of the pathogenesis as opposed to the pathophysiology of migraine which hinders development of preventative agents. This century has seen the shift ...
Delgado-Molina E - - 1999
OBJECTIVE: The purpose of this study was to evaluate the detection of intravascular injection or hematic aspiration in relation to (a) the particular combination of syringe system and needle (there being 3 different syringe systems [2 self-aspirating and 1 non-self-aspirating] and 3 different needles); (b) the anesthetic technique used (direct ...
Finzi A - - 1999
BACKGROUND: Whether tachycardia-dependent paroxysmal AV block, an uncommon complication of exercise stress testing in patients with infranodal conduction disturbances, can result from acute ischemia of the conduction system is still speculative, and is based on post-hoc evidence of right coronary artery disease and abolition of block after coronary angioplasty. METHODS ...
Eriksson P - - 1999
BACKGROUND: Patients with the combination of bundle-branch block and ischemic heart disease have a poor outcome. There is no established criterion for detection of transient ischemia when bundle-branch block is present. OBJECTIVE: To elucidate vectorcardiographic changes during coronary angioplasty of patients with bundle-branch block. DESIGN AND METHODS: The QRS complex ...
Vanpee D - - 1999
We report on the case of a 33-year-old man with recurrent syncopes appearing suddenly due to sustained monomorphic ventricular tachycardias. The electrocardiogram (ECG) showed a right bundle branch block pattern and ST segment elevation in the precordial leads V1 to V2, not explained by ischemia, electrolyte disturbances, toxic ingestion, or ...
Rohr S - - 1999
It has long been established that slow conduction constitutes one of the key mechanisms in the generation of cardiac arrhythmias. Also, it has been recognized that alterations in the cellular architecture of cardiac tissue can contribute to slow conduction. Based on the recent development of an experimental system permitting both ...
Agarwal A K - - 1999
Ten dissimilar electrocardiographic (ECG) patterns associated with right bundle branch block (RBBB) are presented. Electrophysiologic basis of the changes is discussed and possible causes for such diversity outlined. We have not found any aetiological association to this variation. The morphological diversity in RBBB patterns is likely to be related to ...
Racker D K - - 1999
There is little detailed knowledge of the architecture of the AV junction region, the cytoarchitecture of the AV node or of its atrial connections. In the present study, the gross anatomy and topography of intracardiac structures in 21 adult canine hearts were photographically compared in whole and dissected hearts and ...
Okamoto H - - 1999
Despite the clinical importance of cardiac involvement in the prognosis of sarcoidosis, it is often overlooked because of the subclinical disease progression and difficulty in diagnosis. We report here five patients with cutaneous sarcoidosis lesions where cardiac involvement was detected with the appearance of mild cardiac symptoms on a careful ...
Geelen P - - 1999
BACKGROUND: The delayed rectifier potassium current, which comprises both a rapid (I(Kr)) and as slow (I(Ks)) component, is a major outward current involved in repolarization of cardiac myocytes. I(Kr) is the target of most drugs that prolong repolarization, whereas electrophysiological effects resulting from combined block of I(Kr) and I(Ks) still ...
Ohkawa S - - 1999
A 61-year-old female who had shown Raynaud's phenomenon and articular swelling for 10 years, was admitted to hospital because of fever of unknown origin (FUO) and dry cough. She was diagnosed by skin biopsy to have a collagen disease or overlap syndrome. Anemia developed rapidly and FUO persisted, but blood ...
Hung C L - - 1999
Neonatal lupus erythematosus is an uncommon syndrome characterized by a congenital heart block and/or cutaneous lesion. We report a male newborn with neonatal lupus erythematosus presenting with complete heart block, cutaneous lesions, and hydrops. Transplacental passage of anti-SSA/Ro and anti-SSB/La antibodies were positive. Under the regimens of steroid for maternal ...
Kiatchoosakun S - - 1999
The resting 12 leads electrocardiogram was recorded in 3,822 men and 4,969 women (aged 30 years or over), who participated in the First National Health Examination Survey of Thailand and the data was used to determine the prevalence of cardiac arrhythmias. In this apparently normal population 362 subjects (the standard ...
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