Search Results
Results 401 - 450 of 1280
< 4 5 6 7 8 9 10 11 12 13 14 >
Beversdorf D - - 1997
Migraine has been blamed for a variety of temporary and permanent visual complications. We describe the case of a young woman with migraine who suffered recurrent episodes of retinal infarction, one of which occurred during an attack of migraine. The infarctions resulted from occlusions of branches of the central retinal ...
Chia B L - - 1997
An 80-year-old woman with pre-existing complete right bundle branch block presented with severe chest pain. The 12-lead electrocardiogram, together with right-sided chest leads, showed complete right bundle branch block and ST segment elevation in leads II, III, aVF, V5, V6 and V4R to V6R. These electrocardiographic abnormalities indicate acute 'Q ...
Benvenuti L A - - 1997
Expression and distribution of atrial natriuretic peptide (ANP) were studied immunohistochemically in the conducting system and internodal atrial myocardium of 5 adult human hearts. Myocytes from the sinus node and compact atrioventricular node were usually ANP-negative; only a very few cells exhibited ANP immunoreactivity. These ANP-positive myocytes were small and ...
Jones J - - 1997
Emergency cardiac problems are a frequent and significant occurrence in the daily life of the emergency physician. The first part of this article discusses some of the pearls and pitfalls of caring for the cardiac patient ranging from treating wide-complex tachycardia and troubleshooting pacemaker malfunction to diagnosing acute myocardial infarction ...
Song Y - - 1997
A revised technique is described in which the sino-atrial node, the atrio-ventricular node and the distal part of the His bundle and the bundle brances of the cardiac conduction system are demonstrated in longitudinal sections through cutting of 4-5 blocks. The longitudinal sectioning allows observation of continuity between different components ...
Zivin A - - 1997
INTRODUCTION: Idiopathic left ventricular tachycardia typically has a right bundle branch block configuration. The purpose of this case report is to demonstrate that idiopathic ventricular tachycardia arising in or near the left posterior fascicle also may have a left bundle branch block configuration. METHODS AND RESULTS: A 27-year-old woman underwent ...
De Lima G G - - 1997
A 22-year-old woman with an atrial septal defect surgically corrected during childhood presented with a wide QRS complex tachycardia with left bundle branch block morphology. Electrophysiological study was performed and bundle branch reentrant tachycardia was induced with morphology identical to clinical tachycardia. Radiofrequency catheter ablation of the right bundle branch ...
Yamaya Y - - 1997
The atrioventricular (AV) conductive functions were investigated before and after the pharmacological autonomic nervous blockade (PAB) through the electrophysiological study on six horses (AV block group) in which the dropped beats occurred more frequently (over 200 beats/24 hr) and on five horses (control group) in which the dropped beats occurred ...
Brembilla-Perrot B - - 1997
In patients with latent dual atrioventricular nodal pathways a 2:1 ventriculoatrial block often occurs during ventricular pacing and is generally associated with the concomitant appearance of QRS alternans. This type of QRS alternans is related to retrograde conduction, and a concealed retrograde conduction in the His Purkinje system could explain ...
Englund A - - 1997
AIMS: His-Purkinje block induced by incremental atrial pacing is highly predictive of an impending high degree atrioventricular block in patients with bifascicular block. The His potential is, however, sometimes not measurable or is lost in the ventricular depolarization. The aim of this study was to evaluate whether the comparison of ...
Bolognesi R - - 1997
In 2 young adult women who experienced acute heterocyclic antidepressant intoxication, we found a quite unusual electrocardiographic pattern characterized by abnormal ST-tract elevation in the right precordial leads associated with a marked QRS widening (right bundle branch block and left anterior fascicular block type). Because serum electrolyte imbalance and acute ...
Iacovino J R - - 1997
A twenty year follow up of a selected, community population with complete right and left bundle branch block is reviewed by comparative mortality analysis. In this population, where cases and controls were free of hypertension and heart disease at entry, the presence of complete right bundle branch block does not ...
Phillips M F - - 1997
Cardiac disease is a well-known complication of myotonic dystrophy, understanding of which has been increased by recent advances in both molecular techniques and cardiological investigations. Conduction disturbances and tachyarrhythmias occur commonly in myotonic dystrophy. These have been shown to have a broad correlation in severity with both neuromuscular disease and ...
Okabe M - - 1997
We present here a patient with the unusual combination of a newly developed right bundle branch block (RBBB) and an acute posterior myocardial infarction (MI). A dissecting MI with interventricular septal (IVS) rupture was initially thought to have caused RBBB. However, histologic examination revealed that the right bundle branch (RBB) ...
Midiri M - - 1997
Arrhythmogenic right ventricular dysplasia (ARVD) is a heart disease characterized by a total or partial fat replacement of the myocardium. A total of 30 patients were studied with a suspected diagnosis of ARVD. Clinical criteria used for evaluation of ARVD were: (a) ventricular origin arrhythmias with a left bundle branch ...
Parharidis G - - 1997
Aim of this study was to elucidate the diagnostic significance of left axis deviation (LAD) in patients (pts) with chronic (> 6 months) left bundle branch block (LBBB). We retrospectively studied 2094 consecutive pts who underwent cardiac catheterization. All pts had left heart catheterization and coronary angiography, whereas right heart ...
Kam R M - - 1997
Transient and significant decrease in R wave amplitude, associated with transient right bundle branch block, was noted to occur after defibrillation in a defibrillator patient. The mechanism is probably stunning of the right bundle branch, causing right intraventricular conduction delay and decrease in signal amplitude reaching the endocardial sensing dipoles.
Scheller D - - 1997
Lubeluzole is a neuroprotective compound that has been shown to stereoselectively rescue sensorimotor function and reduce infarct size in a photochemical stroke model in rats. Tissue swelling, which occurs in the peri-infarct zone, is accompanied by a compensatory taurine release. Therefore, using a microdialysis technique, we aimed at measuring changes ...
Lalloo D G - - 1997
Envenoming by a number of species of snake may affect the myocardium or cause electrocardiographic changes; several different mechanisms have been proposed. In a prospective study of snake bite in Papua New Guinea, electrocardiographic changes were observed in 36 of 69 patients (52%) envenomed by the taipan (Oxyuranus scutellatus), 2 ...
Handa R - - 1997
We describe a patient with Wegener's granulomatosis (WG) who developed complete heart block. Prompt treatment with steroids and cyclophosphamide led to regression of the complete heart block. The patient was left with a persistent first degree atrio-ventricular block, however. Early treatment may obviate the need for permanent pacing in such ...
Man K C - - 1996
OBJECTIVES: The purpose of this study was to determine the incidence and to clarify the mechanism of 2:1 atrioventricular (AV) block during AV node reentrant tachycardia induced in the electrophysiology laboratory. BACKGROUND: In patients with 2:1 AV block during AV node reentrant tachycardia, the absence of a His bundle potential ...
Newby K H - - 1996
BACKGROUND: Whether thrombolytic therapy alters the incidence and clinical outcome of bundle-branch block is unclear. METHODS AND RESULTS: We examined the occurrence of new-onset bundle-branch block, both transient and persistent, in 681 patients with acute myocardial infarction enrolled in the Thrombolysis and Angioplasty in Myocardial Infarction 9 and Global Utilization ...
Sarter B H - - 1996
We describe a patient with bundle branch reentry ventricular tachycardia with 1:1 VA conduction in whom resetting was performed while obtaining simultaneous recordings from the right ventricular apex (V) and His-bundle electrogram. Both the tachycardia return cycle and the V-His interval demonstrated an increasing reset response, while the His-V interval ...
Pinski S L - - 1996
A patient with 3:2 second-degree AV block after acute inferior wall myocardial infarction showed consistent PR interval shortening on the second conducted beat in each periodicity. Intracardiac electrophysiologic evaluation revealed that the site of block was nodal. A typical Wenckebach pattern with prolongation of the AH interval was noted. The ...
Gillespie N D - - 1996
OBJECTIVE: To assess the ability of a cohort of junior hospital doctors to interpret ECGs which have immediate clinical relevance and influence subsequent management of patients. METHODS: 57 junior hospital doctors were interviewed and asked to complete a standard questionnaire which included eight ECGs for interpretation and a supplementary question ...
Chen W H - - 1996
A left rostral thalamic hematoma was found in a 52-year-old hypertensive man who suffered from a 10-h episode of transient global amnesia (TGA). A neuropsychological study revealed no cognitive impairment in a follow-up period for 5 years. The left rostral part of the thalamus appears to be responsible for his ...
Brezins M - - 1996
Among 1,590 patients with acute myocardial infarction from 1990 to 1994, the rate of primary ventricular fibrillation was 3.6%. The prevalence of smoking, complete left bundle branch block, hypokalemia, and decreased left ventricular function was higher in patients with ventricular fibrillation while those on thrombolytic therapy and those with non-Q-wave ...
Song Y - - 1996
The standard electrocardiographic (ECG) criteria for left ventricular hypertrophy are unreliable in patients with complete right bundle branch block. This study was undertaken to formulate criteria for diagnosing these patients by using body surface mapping. The echocardiographic left ventricular mass was calculated by the Penn method from M-mode measurements. Of ...
Beurrier D - - 1996
We report the case of a patient with both a left bundle branch block-preexcited tachycardia using a Mahaim bundle and a tachycardia exhibiting a left bundle branch pattern without preexcited complexes related to an AV nodal reentrant tachycardia. Successful ablation of the nodoventricular tract was obtained in the posteroseptal location ...
Iwama Y - - 1996
We report a patient with transient atrioventricular (AV) block induced by swallowing. He complained of recurrent dizziness during meals and had suffered from inferior myocardial infarction 1 year before the onset of these symptoms. Radiologic examination showed no apparent esophageal abnormalities. Swallowing a piece of solid food or hot liquid ...
Majumder A A - - 1996
The study was designed to assess the incidence of conduction disturbances, the relationship of the site of infarction with the type of conduction disturbances and the influence of conduction disturbances on the in-hospital prognosis. One hundred consecutive patients (M:F = 89:11) with a age range of 35-60 years with the ...
Robert E - - 1996
Electrophysiologic and proarrhythmogenic effects of imipramine were studied by use of 21 Langendorff-perfused rabbit hearts and high-resolution mapping to analyze epicardial activation of the left ventricle. In 16 hearts, a thin layer of epicardium was obtained by an endocardial cryotechnique (frozen hearts). Five hearts were kept intact (nonfrozen imipramine-treated group). ...
Babuty D - - 1996
Transient reproducible complete infrahisian atrioventricular block occurred after endocavitary cardioversion of ventricular tachycardia and ventricular fibrillation by an automatic implantable cardiac defibrillator in a patient with left bundle branch block and baseline borderline H-V interval. Six months later, a permanent complete atrioventricular block occurred after repetitive endocavitary shocks. Several hypothetical ...
Luca C - - 1996
Patients with acute inferior myocardial infarction (IMI) and complete atrioventricular block (CAVB) have a wide range of mortality rate. This raises the question whether there is no other risk factor that interferes in this particular situation. In our study, mortality rate in patients with acute IMI and CAVB was significantly ...
Shimada M - - 1996
We report a patient with Brugada syndrome who developed sustained monomorphic ventricular tachycardia (SMVT). The patient was a 29-year-old man who experienced recurrent episodes of palpitation and syncope after drinking alcohol. Electrocardiogram showed right bundle branch block and ST-segment elevation in precordial leads V1-3 without Q-Tc prolongation. Organic heart disease ...
Robida A - - 1996
A 9-month-old boy and 4-month-old girl presented with severe heart failure. The electrocardiogram showed complete and "incomplete" left bundle branch block, respectively. In both infants noncompaction of the ventricular myocardium was diagnosed with two-dimensional echocardiography. These cases are thought to be the first descriptions of the occurrence of left bundle ...
Blanck Z - - 1996
An electrophysiologic evaluation was performed in a patient with an idiopathic dilated cardiomyopathy and syncope. Ventricular tachycardia was not inducible despite the use of a variety of pacing maneuvers during sinus rhythm. Only after the electrical induction of atrial fibrillation did sustained bundle branch reentrant tachycardia (with both right and ...
James T N - - 1996
BACKGROUND: Gradually progressive development of complete heart block in young people often is associated with cardiac arrhythmia and sudden death, but the pathogenesis remains unexplained. METHODS AND RESULTS: A young woman with complete heart block died suddenly. Her mother had serological but no clinical evidence of antiphospholipid syndrome. Five brothers ...
Gonzalez-Zuelgaray J - - 1996
INTRODUCTION: The mechanism of functional bundle branch block induced at the onset of supraventricular tachycardia (SVT) is well established. However, no data exist to address the underlying mechanism of functional bundle branch block occurring in the second beat of SVT, when the first beat is conducted with a narrow QRS ...
Thomas S H - - 1996
Verapamil overdose, because of its frequency and severity, represents a significant problem for the emergency physician. With recent search recommending specific therapies for verapamil toxicity, aids to rapid diagnosis hold promise for decreasing morbidity and mortality from overdose of all calcium channel blockers. At this time, diagnosis of verapamil toxicity ...
Sgarbossa E B - - 1996
BACKGROUND: The presence of left bundle-branch block on the electrocardiogram may conceal the changes of acute myocardial infarction, which can delay both its recognition and treatment. We tested electrocardiographic criteria for the diagnosis of acute infarction in the presence of left bundle-branch block. METHODS: The base-line electrocardiograms of patients enrolled ...
Hancock E W - - 1996
A 73-year-old man was admitted to the hospital with substernal discomfort that had begun four hours earlier. The diagnosis was possible acute myocardial infarction.
Walton A S - - 1996
High-speed rotational atherectomy (HSRA) is advocated for calcified and diffusely narrowed coronary arteries. There are often side branches involving these kinds of lesions. The presence of significant lesion-related side branches has been considered a relative contraindication to rotational atherectomy. This study was performed to determine the rate, predictors, and outcome ...
Corrado D - - 1996
OBJECTIVES: We sought to assess whether structural heart disease underlies the syndrome of right bundle branch block, persistent ST segment elevation and sudden death. BACKGROUND: Ventricular fibrillation and sudden death may occur in patients with a distinctive electrocardiographic (ECG) pattern of right bundle branch block and persistent ST segment elevation ...
Wright K N - - 1996
OBJECTIVE: To develop a protocol for reliably inducing atrioventricular (AV) block (ideally first- or second-degree), using radiofrequency energy. DESIGN: An electrosurgical unit was coupled to an ammeter, which was connected to the distal pole of an electrode catheter positioned at the AV node. Control settings had previously been calibrated to ...
Leonelli F M - - 1996
To study the long-term evolution, determinants, and clinical relevance of the conduction abnormalities after orthotopic heart transplantation, 87 patients, followed for a mean of 105 +/- 72 weeks, were divided into 3 groups according to the characteristics of their electrocardiograms compared with their initial electrocardiogram recorded at study entry. The ...
Mustonen P K - - 1996
The incidence and significance of postoperative conduction defects after coronary artery bypass surgery were investigated prospectively in 181 patients. Several pre- and perioperative variables, especially the temperature in three regions of the myocardium, were recorded as explanatory variables. The incidence of conduction defect(s) in the immediate postoperative electrocardiogram (ECG) was ...
Collier C B - - 1996
In a study of the factors involved in the occasional failure of continuous obstetric epidural blockade, contrast injections through epidural catheters and radiographic screening were undertaken in 35 postpartum patients. The two major causes of inadequate block were found to be transforaminal escape of the catheter tip, and persistent unilateral ...
Pehkonen E J - - 1996
One-hundred and nine patients undergoing coronary artery bypass grafting were randomized to seven groups according to cardioplegia technique (5 types) and right coronary patho-anatomy (2 types). There were no major intergroup differences in postoperative outcome. Conduction disturbances developed in 26 patients, also without intergroup difference. Factors predictive of conduction disturbances ...
Atalay S - - 1996
A 9-year-old girl was admitted because she had had palpitations for 2 years. Her electrocardiogram revealed multifocal ectopic beats with left bundle branch morphology, sinoatrial block, and first- and second-degree atrioventricular blocks. Cross-sectional echocardiography demonstrated an enlarged left ventricle and filling defects and sacculations of the posterior left ventricular wall, ...
< 4 5 6 7 8 9 10 11 12 13 14 >