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Results 251 - 300 of 1280
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Cortigiani Lauro - - 2003
PURPOSE: To investigate the prognostic implications of conduction defects in subjects without proven coronary artery disease who had been referred for stress echocardiography. METHODS: The study sample consisted of 1230 patients (574 men and 656 women; mean [+/- SD] age, 63 +/- 10 years) who underwent stress echocardiography with dipyridamole ...
Harrigan Richard A - - 2003
Intraventricular conduction block is the general name given to a varied group of electrocardiographic entities. All share a common finding of some degree of delay in ventricular activation; recognition of these blocks hinges upon analysis of the QRS complex, as well as the ST-T changes associated with them. Bundle branch ...
Batra Anjan S - - 2003
OBJECTIVES: Pacemaker implantation is a standard recommendation for patients with persistent complete heart block following surgery for congenital heart disease. This study was performed to determine the incidence and clinical significance of late recovery of atrioventricular conduction following pacemaker implantation. METHODS: Between 1990 and 2001, 5662 open cardiac procedures for ...
Chiam Heng Wu - - 2003
AIM: To find a medium to mark the surgical margins and orientation of complex specimens that is reliable, easy to use, safe and inexpensive. METHODS: Several different paints, dyes and pigments were tested. A series of pigments supplied by SICPA Australia Pty Ltd, when fixed to the specimen in acetic ...
Reckova Maria - - 2003
The His-Purkinje system (HPS) is a network of conduction cells responsible for coordinating the contraction of the ventricles. Earlier studies using bipolar electrodes indicated that the functional maturation of the HPS in the chick embryo is marked by a topological shift in the sequence of activation of the ventricle. Namely, ...
Matsuoka K - - 2003
A case is reported of a patient with only isolated conduction abnormalities of the His-Purkinje system with no identifiable myocardial or valvar dysfunction, leading to "clockwise" and "counterclockwise" bundle branch re-entrant ventricular tachycardias (BBRVTs). The electrophysiological study showed infra-Hisian conduction system disease and two different inducible wide QRS complex tachycardias. ...
Lee Seung-Joon - - 2003
BACKGROUND: Population studies have identified the presence of bundle branch block (BBB) as a risk factor for increased mortality in patients with known cardiac disease. It is unknown how chronic ventricular dyssynchrony resulting solely from conduction delay affects ventricular function. METHODS AND RESULTS: Subjects were retrospectively identified from the University ...
Moreira José Marcos - - 2003
A male patient with palpitations and syncope during an episode of atrial fibrillation was evaluated. After DC cardioversion, the ECG showed a pattern of pre-excitation compatible with right posteroseptal bypass tract. The patient was submitted to RF. During energy application a slow junctional rhythm without AV block was noted. Twenty-four ...
Kanamura Tetsuhiro - - 2003
The hilar bifurcation (HB), a wedged portion between the left and right portal vein origins, often issues the caudate branch. However, the HB territory in the caudate lobe has not been well recognized during liver surgery. In 50% of 48 human livers (25 usual livers and 23 with the external ...
Nowak Dariusz - - 2003
Typological differentiation of coronary arteries binds to various areas of vascularisation, which could suggest essential differences between vasculatory dimensions. There are not many papers analysing the influence of heart vascularisation on epicardial vessel dimensions during postnatal human life, furthermore, there are hardly any papers dealing with the prenatal period. The ...
Moorman Antoon F M - - 2003
Within one day after the formation of the linear heart an adult type of electrocardiogram (ECG) can be monitored, reflecting the development of coordinated activation of the heart. The possibility that during evolution and ontogenesis of the heat, this development is achieved by localized growth of cardiac chambers rather than ...
Doi Y - - 2003
A 56 year old woman with severe right heart failure and complete atrioventricular block was referred to hospital for further examination. Symptoms and signs suggestive of Fabry's disease, such as corneal opacities, acroparaesthesias, hypohidrosis, and angiokeratoma, were not noted. Echocardiography showed a diffuse hypertrophic left ventricular wall and paradoxical movement ...
Watanabe Michiko - - 2003
The proper sequence of electrical activation of the mature four-chambered heart requires specialized conduction pathways including the His-Purkinje system and a nearly complete separation of the atrial and ventricular myocardium. We tracked the emergence of the structure of the mature His-Purkinje system in the developing chicken embryo with anti-polysialylated neural ...
Usyk Taras P - - 2003
Experimental studies have shown that biventricular pacing can improve systolic function in the failing heart with bundle branch block. The goal of this study was to develop and validate a three-dimensional computational model of the dilated failing heart with left bundle branch block to investigate how biventricular pacing can improve ...
Pastore Carlos Alberto - - 2003
BACKGROUND: The Batista operation, or partial ventriculectomy, has been designed by the Brazilian surgeon Dr. Randas Batista as an alternative method for treating patients with idiopathic dilated cardiomyopathy. HYPOTHESIS: This study aimed to analyze electro- and vectorcardiographic data obtained from patients who underwent such surgery, and to evaluate its electrical ...
Ho Siew Yen - - 2003
Abnormal architecture of the conduction system affects both the normally structured and the congenitally malformed heart. While the majority of malformed hearts have more-or-less normal arrangements of the conduction system, there are others with significant deviations. In particular, the derangements are related to malalignment of the ventricular septum in the ...
Strauchen James A - - 2003
CONTEXT: The etiology of lymph node infarction may be difficult or impossible to determine by histologic examination. Lymph node infarction is followed by malignant lymphoma in some but not all patients. The role of immunohistochemistry in the evaluation of lymph node infarction is not well defined. Although it is widely ...
Li Jian-Ming - - 2002
This report describes an unusual case of bidirectional tachycardia eliminated with radiofrequency ablation. The tachycardia had alternating right and left bundle branch block morphology on a beat-to-beat basis and was successfully eliminated by ablating the right and left bundle branch block ventricular ectopic beats present during sinus rhythm.
Strobel John S - - 2002
We describe a patient with frequent, symptomatic, and drug-refractory premature ventricular contractions (PVCs) with a right bundle branch block, inferior axis morphology suggestive of a left ventricular outflow tract (LVOT) origin. Successful ablation of the PVCs was performed from the left coronary cusp of the aortic valve. We discuss our ...
Benchimol-Barbosa P R - - 2002
Ventricular late potentials are low-amplitude signals originating from damaged myocardium and detected on the body surface by ECG filtering and averaging. Digital filters present in commercial equipment may interfere with the ability of arrhythmia stratification. We compared 40-Hz BiSpec (BI) and classical 40- to 250-Hz band-pass Butterworth bidirectional (BD) filters ...
Chia N - - 2002
Peripheral nerve blocks are associated with minimal haemodynamic disturbance. It is perhaps ideal for high-risk surgical patients who cannot tolerate the adverse consequences of even the slightest attenuation of haemodynamic response. However, peripheral nerve blockade is often perceived to be time consuming and undependable as the sole anaesthetic. In this ...
Betts Tim R - - 2002
INTRODUCTION: Previous mapping studies of right atrial (RA) activation during sinus rhythm have been limited by the use of epicardial electrode plaques in open chest subjects or microelectrodes in the excised heart. This study describes global RA endocardial activation patterns using high-density mapping and compares the results with underlying endocardial ...
Kuusela E - - 2002
Baseline and perianaesthetic 24-hour Holter recordings were carried out in six healthy beagles. After dexmedetomidine premedication anaesthesia was induced with propofol and maintained with propofol infusion or isoflurane for one hour. Dexmedetomidine alone was used as control. The recordings were analysed for ventricular premature complexes (VPC), atrioventricular (AV) blocks and ...
Watanabe Seiji - - 2002
OBJECTIVE: To compare the effects of the stimulation of adenosine receptors and acetylcholine receptors in the cardiac conduction system in patients with ischemic heart disease. DESIGN: Prospective. SETTING: University hospital. PARTICIPANTS: Patients scheduled for coronary artery bypass graft surgery (n = 37). INTERVENTIONS: The patients were divided into 3 groups: ...
Newton Jonathan C - - 2002
INTRODUCTION: A proposed mechanism of the maintenance of ventricular fibrillation (VF) determined by studying small hearts or segments of large hearts is that a single stable rotor exists at the site of maximal activation rate, which gives rise to activation fronts that propagate into slower activating regions where they frequently ...
Zhang Weiwei - - 2002
OBJECTIVE: To assess the complications of percutaneous tansluminal septal myocardial ablation (PTSMA) for the treatment of hypertrophic obstructive cardiomyopathy (HOCM). METHODS: Seventy-two patients with symptomatic left ventricular outflow tract obstruction were diagnosed by echocardiography or catheterization procedures. Absolute ethanol was injected into the target coronary artery branch (branches) for septal ...
Riggs Jack E - - 2002
A 20-year-old man was discharged from the U.S. Army because of increasing gait abnormalities. One year later, he developed episodes of syncope secondary to high-degree atrial/ventricular block with periods of complete heart block and ventricular asystole. A permanent dual-chamber, rate-responsive cardiac pacemaker was implanted. At age 29 years, an abnormal ...
Kusumoto Fred M - - 2002
Bradycardia due to sinus node dysfunction and atrioventricular block is more commonly observed in the elderly. Aging is associated with progressive fibrosis in both the sinus node and atrioventricular conduction system (AV node, His bundle, right and left bundles). In the absence of reversible causes implantation of a permanent pacemaker ...
Sedmera David - - 2002
The developing cardiovascular system is known to operate normally in a hypoxic environment. However, the functional and ultrastructural recovery of embryonic/fetal hearts subjected to anoxia lasting as long as hypoxia/ischemia performed in adult animal models remains to be investigated. Isolated spontaneously beating hearts from Hamburger-Hamilton developmental stages 14 (14HH), 20HH, ...
Fukuda Toyoki - - 2002
BACKGROUND: Complete right bundle branch block carries a deleterious effect on the long-term outcome of patients who undergo surgical treatment of the perimembranous ventricular septal defect. We describe a novel suturing method to reduce the prevalence of complete right bundle branch block. METHODS: From March 1996 through December 2000, 48 ...
Küçükosmano─člu Osman - - 2002
Cardiac complications of iron overload are the most common cause of death in patients with thalassemia major. These complications include recurrent pericarditis, refractory congestive heart failure and rhythm disorders. The usual rhythm disturbances are supraventricular or ventricular premature contractions and first-or second-degree heart block. Complete heart block is a very ...
Silverman Mark E - - 2002
Walter Holbrook Gaskell was a nineteenth-century British physiologist whose investigations from 1874 until 1889 became central to our current understanding of cardiac physiology. His many cardiac contributions include the following: 1) the recognition of certain inherent properties of cardiac muscle; 2) the experimental proof that led to the acceptance of ...
Coromilas James - - 2002
BACKGROUND: K(ATP) channels, activated by ischemia, participate in the arrhythmogenic response to acute coronary occlusion. The function of these channels in border zones of healing infarcts, where arrhythmias also arise, has not been investigated. Do these channels remain maximally activated during infarct healing, or do they downregulate after a period ...
Bourke John P - - 2002
This chapter has summarized briefly the current state of our knowledge on the incidence, etiology, presentation, investigation, and management of patients with AV block. The scope of the material covered has been widened intentionally to include a plethora of AV-conduction abnormalities because of the increases in the understanding of their ...
Suleymenlar Gultekin - - 2002
Wegener's granulomatosis is a systemic inflammatory disorder of unknown cause that usually affects the upper and lower respiratory tracts as well as the kidney. Cardiac involvement is rare, although electrocardiographic abnormalities, coronary artery vasculitis, cardiac arrhythmias, and myocardial infarction have been reported in the literature. A 27-year-old female patient with ...
Ho Siew Yen - - 2002
The relationship between anatomy and function has long been recognised. Understanding the gross structure, and the myoarchitecture, of the atriums is fundamental to investigations into the substrates and therapy of atrial fibrillation. Based primarily on our experience with normal human hearts, this review provides, firstly, a basis of comparison of ...
Gonzalez Mario D - - 2002
A patient with an acute anteroseptal myocardial infarction and intermittent right bundle-branch block is presented. Abnormal Q waves in right precordial leads were only observed during right bundle-branch block. In the absence of right bundle-branch block, depolarization of the right ventricular free wall concealed the abnormal Q waves typical of ...
Chrysostomakis S I - - 2002
The newer implantable loop recorders recently introduced (Reveal Plus. Medtronic Inc, Minneapolis, MN, U.S.A.). equipped with auto activation capabilities, are expected to expand our diagnostic abilities in the investigation of syncopal episodes. The case presented here is that of a man with pre-syncopal and syncopal episodes, without organic heart disease, ...
Friedman Paul A - - 2002
Bidirectional isthmus block is associated with successful atrial flutter ablation, whereas creation of increased isthmus conduction delay without block can be proarrhythmic. Often, halo catheter electrodes fail to provide adequate sub-Eustachian isthmus recordings. The aim of this study was to determine if progressive isthmus conduction delay results in the false ...
Matsuyama Taka-Aki - - 2002
INTRODUCTION: The length of the His bundle and the precise location of injury responsible for split His potentials have not been fully established in patients with intra-Hisian block. We conducted an autopsy study comparing histologic findings in intra-Hisian block versus control hearts. METHODS AND RESULTS: We studied hearts from 4 ...
Akiyoshi Kazunari - - 2002
Solution properties of amphiphilic methoxy poly(ethylene oxide)-block-amyloses (MPEO-amyloses) in chloroform were investigated by SLS and DLS. The results indicated that MPEO-amyloses dissolved in chloroform containing 2 wt % DMSO by their self-associations. The complexation of MPEO-amylose with methyl orange (MO) was significantly enhanced in the amylose domain of the associate ...
Fowler Raymond L - - 2002
This revised classification system is designed to etch the indicators of a block into your memory. You only have to remember that the degree is the number of atrial beats getting through to the ventricles (all, some or none) and the type is where the block occurs (AV node or ...
Mutlak Diab - - 2002
BACKGROUND: Percutaneous transluminal septal ablation was recently introduced as an alternative to surgical treatment of hypertrophic obstructive cardiomyopathy. In this procedure, alcohol is injected into a proximal septal artery to create a localized myocardial infarction. OBJECTIVES: To characterize the immediate and medium-term results following PTSMA. METHODS: Of 13 patients referred ...
Malik Javid A - - 2002
First-degree heart block is a common electrocardiographic manifestation of acute rheumatic fever and is included in Jones' diagnostic criteria. Other electrocardiographic changes such as sinus tachycardia, bundle branch blocks. nonspecific ST-T wave changes, atrial and ventricular premature complexes have been reported with variable frequency. However, complete heart block is an ...
Ho John S - - 2002
A 41-year-old man with no relevant cardiac history presented for evaluation of episodic syncope. Electrocardiography showed sinus rhythm with right bundle-branch block and Q waves in leads II, III, and aVF. Subsequent exercise treadmill testing and technetium 99m sestamibi study revealed a reversible posterior defect. Coronary angiography later showed a ...
Sugiura T - - 2001
BACKGROUND: Early reperfusion therapy has reduced the infarct size and mortality rate in patients with acute myocardial infarction (AMI). The occurrence of bundle-branch block in AMI is related to the amount of myocardial damage and the insult to the conduction system. HYPOTHESIS: To evaluate the clinical and angiographic factors related ...
Robinson B V - - 2001
Between 1989 and 2000, 21 fetuses were diagnosed with complete atrioventricular block. Seven women with fetal ventricular rates of less than 60 were given oral terbutaline, and 6 of these had an initial increase in the fetal ventricular rate. Four fetuses (57%) maintained an increased average rate of 60 beats ...
Takehara N - - 2001
Familial atrioventricular heart block affected by the autonomic nervous system has rarely been documented. We describe a 35-year-old man who had first-degree atrioventricular heart block with a PR interval of 0.46 s. He had a family history of 2 members with complete heart block and 1 with documented atrial standstill. ...
Yu T H - - 2001
Symptomatic second- or third-degree atrioventricular (AV) block at any anatomical level is a class I indication for permanent pacemaker implantation. We describe a 44-year-old male with acute viral myocarditis who suffered from syncope followed by a seizure attack associated with AV conduction disturbance. His initial electrocardiogram in our emergency room ...
Mattu A - - 2001
Tall lead V1 (tall RV1), defined as an R/S ratio equal to or greater than 1, is not an infrequent occurrence in emergency department patients. This electrocardiographic finding exists as a normal variant in only 1% of patients. Physicians should therefore be familiar with the differential diagnosis for this important ...
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