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Results 201 - 250 of 1546
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Dudás-Györki Zoltán - - 2009
The aim of the present study was to verify the validity of two-dimensional echocardiographic (2DE) measurement technique in dogs with left atrial enlargement. Thirty-one dogs with clinically and echocardiographically proven cardiac diseases were randomly selected. The left atrial right-to-left diameter (La(r-l)) and the diameter of the left atrium just above ...
Hildreth Victoria V Institute of Human Genetics, Newcastle University, - - 2009
Sonic hedgehog (Shh) is a secreted morphogen necessary for the production of sidedness in the developing embryo. In this study, we describe the morphology of the atrial chambers and atrioventricular junctions of the Shh null mouse heart. We demonstrate that the essential phenotypic feature is isomerism of the left atrial ...
Lin Xianming - - 2010
While ventricular gap junctions contain only Cx43, atrial gap junctions contain both Cx40 and Cx43; yet the functional consequences of this co-expression remain poorly understood. We quantitated the expression of Cx40 and Cx43 and their contributions to atrial gap junctional conductance (g(j)). Neonatal murine atrial myocytes showed similar abundances of ...
Lanfranchi Antonio - - 2009
A 74-year-old woman was at the emergency department for acute chest pain, dyspnea and severe transient hypotension. History was arterial hypertension and external electrical cardioversion (EEC) for persistent atrial fibrillation (AF) 8 days before admission. At that time echocardiography was normal. The patient underwent coronary angiography with no evidence of ...
Caso P - - 2009
AIMS: Assessment of left and right systolic atrial reservoir function in asymptomatic mitral stenosis (MS) by strain and strain rate imaging (SRI) and their prognostic power at 3 year follow-up was the purpose of this study. There is clear indication to treat (by surgery or percutaneous valvotomy) symptomatic patients with ...
Rosso Raphael - - 2010
Focal atrial tachycardia is a relatively uncommon arrhythmia. Nevertheless, the management of highly symptomatic patients with focal atrial tachycardia can be problematic owing to the poor response to medical treatment. Moreover, focal atrial tachycardia can trigger other atrial arrhythmias like atrial fibrillation and flutter. Radiofrequency ablation of focal atrial tachycardia ...
Stern Joshua D - - 2009
A patient with atrial tachycardia presented with dyspnoea on exertion. Transoesophageal echocardiography revealed idiopathic left atrial appendage stenosis. The mouth of the atrial appendage was narrowed, and there was a high velocity to and fro jet between the left atrial body and the left atrial appendage. The study, therefore, suggested ...
Aurigemma Gerard P GP University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA. - - 2009
The left atrium is a validated marker of clinical and subclinical cardiovascular disease. Left atrial enlargement is often seen among older individuals; however, there are few population-based data regarding normal left atrial size among older persons, especially from those who are healthy, and from women. Furthermore, because the left atrium ...
Spodick David H - - 2009
Interatrial block (IAB; P duration >or=110 ms) is a common electrocardiogram abnormality, which in addition to reduced left atrial function predicts atrial fibrillation and other arrhythmias. P terminal force (Ptf) +/- biphasic P in lead V(1)>or= the area of one small square on the grid also indicates left atrial abnormality, ...
Kubota Hiroshi - - 2009
To determine the clinical efficacy of application of infrared energy to the beating heart as a means of creating electrical blocks, an original infrared coagulator (KIRC-119; Phomec Inc, Tokyo, Japan) was applied to the atrium of a patient with atrial fibrillation. A postoperative electrophysiologic study was performed to confirm its ...
Koçinaj Dardan - - 2009
Cardiac disease is the most common cause of death in patients with end-stage renal disease. It is assumed that the high rate of cardiovascular mortality is related to accelerated atherosclerosis. Patients with chronic renal insufficiency have an increased prevalence of coronary artery disease, silent myocardial ischaemia, complex ventricular arrhythmias, atrial ...
Hoffmann Andrew D - - 2009
The genesis of the septal structures of the mammalian heart is central to understanding the ontogeny of congenital heart disease and the evolution of cardiac organogenesis. We found that Hedgehog (Hh) signaling marked a subset of cardiac progenitors specific to the atrial septum and the pulmonary trunk in the mouse. ...
Akcay Ahmet - - 2009
AIM: Slow coronary flow (SCF) is characterized by angiographically normal coronary arteries with delayed opacification of the distal vasculature. The purpose of this study was to evaluate atrial electromechanical couplings and P-wave dispersion (Pd) reflecting intraatrial and interatrial conduction delays in SCF patients and the relationship between these parameters and ...
Patanè Salvatore - - 2011
Rhythm disturbances have been described in immunological and connective diseases. Scleroderma is a fibrotic condition characterized by immunological abnormalities, vascular injury and increased accumulation of extracellular matrix proteins. The heart is one of the major organs involved in scleroderma, the involvement of which can be manifested by myocardial disease, conduction ...
Spodick David H - - 2009
BACKGROUND AND HYPOTHESIS: Interatrial block (IAB: P-duration > 100 ms) is poorly recognized in hospital populations. In addition to reduced left atrial function and left atrial enlargement it predicts atrial fibrillation and other arrthymias. P-terminal force (Ptf): +/- biphasic P in lead V(1) > or = area of 1 small ...
Chua Yeow Leng - - 2009
The aim of this study was to assess the release of endothelium-derived relaxing factors from the endocardium of canine atrial appendage. To study the release of endothelium-derived relaxing factor (EDRF) from intact atrial endocardial endothelium, tube-shaped sutures of canine atrial appendages were performed and effluents from these tubes were bioassayed ...
Traykov Vassil Borislavov - - 2009
We report the case of a patient with atrial flutter late after tricuspid valve replacement for Ebstein's anomaly. Computed tomographic angiography revealed that coronary sinus ostium and part of the right atrial isthmus were located on the ventricular side of the valve ring due to the specific surgical approach in ...
Pan Q - - 2009
The left atrial posterior wall (LAPW) plays a critical role in atrial fibrillation, but the underlying mechanism remains unclear. In the present study, we sought to characterize the histological features of the LAPW. Different atrial regions were dissected from hearts of normal Sprague-Dawley rats and humans. Haematoxylin/eosin and van Gieson ...
Schleich Jean-Marc - - 2009
Learning embryology remains difficult, since it requires understanding of many complex phenomena. The temporal evolution of developmental events has classically been illustrated using cartoons, which create difficulty in linking spatial and temporal aspects, such correlation being the keystone of descriptive embryology. We synthesized the bibliographic data from recent studies of ...
Sánchez-Quintana Damián - - 2009
BACKGROUND/OBJECTIVE: The purpose of this study was to clarify the spatial relationship between the left phrenic nerve (LPN) and key cardiac structures in order to minimize the risk of phrenic nerve injury during interventions. METHODS: The course and relationship of the LPN to various cardiac structures were examined by gross ...
Bronzetti Gabriele - - 2009
Atrial thrombosis is a relatively rare event in children. We report a case of a newborn with AFI who after restoration of sinus rhythm, developed atrial thrombus on a prominent Chiari network floating between the right and left atrium through the patent foramen ovale. The thrombus was resolved following treatment ...
Drager Luciano F - - 2010
Obstructive sleep apnea (OSA) is associated with increased risk for the occurrence and recurrence of atrial fibrillation. However, the mechanisms involved are poorly understood. We studied 73 middle-aged subjects divided in two groups: with moderate-to-severe OSA (apnea-hypopnea index [AHI] ≥ 15 events/h) or without OSA (AHI ≤5 events/h) by polysomnography. ...
Shalganov Tchavdar N - - 2009
OBJECTIVE: The objective was to study atrial activation intervals and their relation to the tachycardia cycle length (TCL) as electrophysiologic parameters differentiating focal (FAT) from macroreentrant atrial tachycardias (MRAT) originating in the right atrium. METHODS: In 21 patients (8 men) with 30 successfully ablated right atrial tachycardias (15 focal) the ...
Sawhney Navinder S - - 2009
Typical atrial flutter (AFL) is a common atrial arrhythmia that may cause significant symptoms and serious adverse effects including embolic stroke, myocardial ischemia and infarction, and rarely a tachycardia-induced cardiomyopathy as a result of rapid atrioventricular conduction. As a result of the well-defined anatomic and electrophysiological substrate, and the relative ...
Sörnmo Leif - - 2009
The analysis of atrial fibrillation in non-invasive ECG recordings has received considerable attention in recent years, spurring the development of signal processing techniques for more advanced characterization of the atrial waveforms than previously available. The present paper gives an overview of different approaches to the extraction of atrial activity in ...
Patanè Salvatore - - 2010
Subclinical hyperthyroidism is an increasingly recognized entity that is defined as a normal serum free thyroxine and free triiodothyronine levels with a thyroid-stimulating hormone level suppressed below the normal range and usually undetectable. It has been reported that subclinical hyperthyroidism is not associated with coronary heart disease or mortality from ...
Centurión Osmar Antonio - - 2009
Atrial conduction disease provides a suitable substrate for reentry and appears to be a major predisposing factor for the development of atrial fibrillation. It was demonstrated that when depressed conduction was observed in recordings from human atrial muscle, the ultra-structure was usually abnormal. Areas of poorly coupled fibers in diseased ...
Solzbach Ulrich - - 2010
We described a complication during percutaneous coronary intervention. A bleeding into the left atrial wall occurred after stenting of the right coronary artery. Echocardiography revealed the diagnosis of a left atrial intramural hematoma. Conservative treatment was performed. After 4 weeks the hematoma resolved completely. Left atrial intramural hematoma as a ...
Gong Yong-tai - - 2009
BACKGROUND: We hypothesize that increased atrial oxidative stress and inflammation may play an important role in atrial nerve sprouting and heterogeneous sympathetic hyperinnervation during atrial fibrillation (AF). To test the hypothesis, we examined whether the antioxidant and anti-inflammatory treatment with probucol attenuates atrial autonomic remodeling in a canine model of ...
Liu Xu - - 2009
BACKGROUND AND OBJECTIVES: Complex fractionated atrial electrograms (CFAE) is distributed at preferential sites of atrium, and the mechanism underlying CFAE is not fully understood. We hypothesized that preexisting atrial abnormalities may be involved in the formation of CFAE. METHODS: Twelve pigs were subjected to acetylcholine infusion and right atrial pacing ...
Ho S Y - - 2009
Atrial structures are important in the current era of cardiac interventions using percutaneous transcatheter procedures. Understanding their locations and component parts helps to reduce risks of procedural-related damage. The general arrangement of the myofibers that make up the atrial walls is reviewed to provide a morphologic basis for atrial conduction ...
Douglas Yvonne L - - 2009
The developing sinus venosus myocardium, derived from the posterior heart field, contributes to the atrial septum, the posterior atrial wall, the sino-atrial node, and myocardium lining the pulmonary and cardinal veins, all expressing podoplanin, a coelomic and myocardial marker. We compared development and differentiation of the myocardium and vascular wall ...
Shah Dipen - - 2009
PURPOSE OF REVIEW: The present popularity of catheter ablation for atrial fibrillation has generated interest in the pathophysiology of arrhythmias originating from the left atrium. An improved understanding of ECG manifestations of reentrant left atrial arrhythmias has obvious clinical implications. An ideal goal would be to achieve diagnostic precision similar ...
Rosman Jonathan - - 2009
A 67 year old man presented with a serum potassium of 7.7 mEq/L and slow atrial flutter with variable A-V block and peaked T waves. Initial treatment for hyperkalemia was followed by an increase in the atrial flutter rate to 300 beats per minute. After hemodialysis the rhythm converted to ...
Uldry Laurent L Signal Processing Laboratory of the Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland. - - 2009
We studied the mechanisms of spontaneous termination of atrial fibrillation in a biophysical model of human atria, during the eight seconds preceding termination. The earliest detectable changes in the cycle length and the number of wavefronts occurred about three seconds prior to termination. We compared the mechanisms involved in the ...
Cardinal René - - 2009
Ganglionated plexuses (GPs) are major constituents of the intrinsic cardiac nervous system, the final common integrator of regional cardiac control. We hypothesized that nicotinic stimulation of individual GPs exerts divergent regional influences, affecting atrial as well as ventricular functions. In 22 anesthetized canines, unipolar electrograms were recorded from 127 atrial ...
Cui Qiqiong - - 2008
OBJECTIVES: The objective of the study was to evaluate the differences in atrial electromechanical coupling time and atrial volume between patients with idiopathic paroxysmal atrial fibrillation and control subjects and to investigate the influencing factors of electromechanical coupling time. METHODS AND RESULTS: We studied 46 patients with idiopathic PAF (group ...
Michelfelder Erik - - 2008
Hypoplastic left heart syndrome (HLHS) with intact atrial septum (IAS) is a severe congenital cardiac malformation with little possibility of postnatal survival, unless an intra-atrial connection is created promptly after delivery. The timing of that intervention is often dictated by logistic restrictions, such as the proximity of the delivery room ...
Bean Eric - - 2008
To describe a novel atrial retractor and compare 2 methods of intraoperative left atrial retraction for minimally invasive mitral valve repair. Left atrial retraction was performed on 5 swine cadavers to evaluate performance (percent of mitral valve annulus accessible), complications encountered, ease of use, and surgical time for the minimally ...
Ariyarajah Vignendra - - 2009
OBJECTIVE: Isolated atrial amyloidosis (IAA) is associated with atrial tachyarrhythmias. However, only a few studies have appraised atrial tachyarrhythmias and atrial depolarization abnormalities in connection with high-grade IAA. We conducted a collaborative retrospective study to assess this association. METHODS: One hundred consecutive autopsied hearts were studied histologically for IAA. To ...
Arthur Mary E - - 2009
BACKGROUND: Estimation of right atrial pressure (RAP) from variations in the diameter of the inferior vena cava (IVC) during the respiratory cycle using transthoracic echocardiography (TTE) is used routinely to calculate pulmonary artery systolic pressure, adding to right ventricular systolic pressure (RVSP) from the jet velocity of tricuspid regurgitation. Using ...
Rodrigues Ana Clara Tude - - 2009
Radiofrequency ablation of the pulmonary veins has been used to treat patients with paroxysmal atrial fibrillation (AF), and atrial damage after ablation is an issue of concern. To evaluate left atrial function shortly and midterm after ablation, 33 consecutive patients with paroxysmal AF were studied at baseline, 24 hours, and ...
Asirvatham Samuel J - - 2009
The cavotricuspid isthmus (CVTI) is the well-established location of atrial tissue critical for the maintenance of typical atrial flutter. The CVTI begins at the electrically inert tricuspid valve and includes the atrial myocardium up to the inferior vena cava (IVC). In this article, we discuss relevant CVTI and right atrial ...
Zhang Qing - - 2008
Atrial function is an integral part for the proper performance of the circulatory system. Assessment of its haemodynamic and mechanical characteristics by use of non-invasive echocardiography, including tissue Doppler velocity and strain imaging, may provide a better insight into atrial function and its relationship with ventricular function. From an electromechanical ...
Zellerhoff Stephan - - 2009
BACKGROUND: The long-QT syndromes (LQTS) are inherited electrical cardiomyopathies characterized by prolonged ventricular repolarization and ventricular arrhythmias. Several genetic reports have associated defects in LQTS-causing genes with atrial fibrillation (AF). We therefore studied whether atrial arrhythmias occur in patients with LQTS under daily-life conditions. METHODS: We systematically assessed atrial arrhythmias ...
Leung Dominic Y - - 2008
Left atrial (LA) volume has recently been identified as a potential biomarker for cardiac and cerebrovascular disease. However, evidence regarding the prognostic implications of LA volume still remains unclear. Evaluation of LA size and function using traditional and more recent echocardiographic parameters is potentially feasible in the routine clinical setting. ...
Altin Timucin - - 2008
AIM: Atrial undersensing (AUS) in single-lead VDD pacemakers may be due to diminished P-wave amplitude secondary to local inflammation beneath the electrodes closer to atrial wall. The aim of this study was to assess the potential effect of distance between atrial electrode and atrial wall on immediate and long-term atrial ...
Modi Amit - - 2008
Papillary endothelial hyperplasia (PEH) of the heart is extremely rare. This report describes a case of left atrial appendage PEH discovered by intraoperative palpation during mitral valve repair in a 69-year-old woman. The lesion was treated successfully by surgical excision of the left atrial appendage. Immunohistochemistry analysis confirmed the diagnosis ...
Voeller Rochus K RK Division of Cardiothoracic Surgery, Washington University School of Medicine, Barnes-Jewish Hospital, St Louis, MO 63110, - - 2008
The effects of the Cox maze procedure on atrial function remain poorly defined. The purpose of this study was to investigate the effects of a modified Cox maze procedure on left and right atrial function in a porcine model. After cardiac magnetic resonance imaging, 6 pigs underwent pericardiotomy (sham group), ...
Chrysohoou Christina - - 2008
The authors sought to investigate whether serum uric acid levels are associated with systolic left and right ventricular function, as well as left atrial function in patients with newly diagnosed heart failure. The authors enrolled 106 consecutive patients (mean age 65+/-13 years). Echocardiographic and biochemical assessment was performed during the ...
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