Добірка наукової літератури з теми "Left atrium; atrial fibrillation; cardiac magnetic resonance imaging"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Left atrium; atrial fibrillation; cardiac magnetic resonance imaging".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Left atrium; atrial fibrillation; cardiac magnetic resonance imaging"
1
Kuchynka, Petr, Jana Podzimkova, Martin Masek, Lukas Lambert, Vladimir Cerny, Barbara Danek, and Tomas Palecek. "The Role of Magnetic Resonance Imaging and Cardiac Computed Tomography in the Assessment of Left Atrial Anatomy, Size, and Function." BioMed Research International 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/247865.
Повний текст джерелаАнотація:
In the last decade, there has been increasing evidence that comprehensive evaluation of the left atrium is of utmost importance. Numerous studies have clearly demonstrated the prognostic value of left atrial volume for long-term outcome. Furthermore, advances in catheter ablation procedures used for the treatment of drug-refractory atrial fibrillation require the need for detailed knowledge of left atrial and pulmonary venous morphology as well of atrial wall characteristics. This review article discusses the role of cardiac magnetic resonance and computed tomography in assessment of left atrial size, its normal and abnormal morphology, and function. Special interest is paid to the utility of these rapidly involving noninvasive imaging methods before and after atrial fibrillation ablation.
2
Ji, Mengmeng, Lin He, Lang Gao, Yixia Lin, Mingxing Xie, and Yuman Li. "Assessment of Left Atrial Structure and Function by Echocardiography in Atrial Fibrillation." Diagnostics 12, no. 8 (August 5, 2022): 1898. http://dx.doi.org/10.3390/diagnostics12081898.
Повний текст джерелаАнотація:
Atrial fibrillation (AF) is the most common arrhythmia with significant morbidity and mortality. Exacerbated by the aging population, the prevalence of AF is gradually increasing. Accurate evaluation of structure and function of left atrium (LA) has important prognostic significance in patients with AF. Echocardiography is the imaging technique of first choice to assess LA structure and function due to its better availability, accessibility and safety over cardiac computed tomography and cardiac magnetic resonance. Therefore, the aim of this review is to summarize the recent research progress of evaluating LA size by three-dimensional echocardiography and LA function by speckle tracking echocardiography (STE) in predicting the occurrence and recurrence of AF and determining the risk of stroke in AF. In addition, we summarized the role of traditional echocardiography in detecting AF patients that are at high risk of heart failure or cardiovascular death.
3
Moral, Sergio, Marc Abulí, Pau Vilardell, Emilce Trucco, Esther Ballesteros, and Ramon Brugada. "Multimodality Imaging in the Study of the Left Atrium." Journal of Clinical Medicine 11, no. 10 (May 18, 2022): 2854. http://dx.doi.org/10.3390/jcm11102854.
Повний текст джерелаАнотація:
The left atrium (LA) plays a vital role in maintaining normal cardiac function. Many cardiac diseases involve the functioning of the LA directly or indirectly. For this reason, the study of the LA has become a priority for today’s imaging techniques. Assessment of LA size, function and wall characteristics is routinely performed in cardiac imaging laboratories when a patient undergoes transthoracic echocardiography. However, in cases when the LA is the focus of disease management, such as in atrial fibrillation or left atrial appendage closure, the use of multimodality is critical. Knowledge of the usefulness of each cardiac imaging technique for the study of LA in these patients is crucial in order to choose the most appropriate treatment. While echocardiography is the most widely performed technique for its evaluation and the study of wall deformation analysis is increasingly becoming more reliable, multidetector computed tomography allows a detailed analysis of its anatomy to be carried out in 3D reconstructions that help in the approach to interventional treatments. In addition, the evaluation of the wall by cardiac magnetic resonance imaging or the generation of electroanatomical maps in the electrophysiology room have become essential tools in the treatment of multiple atrial pathologies. For this reason, the goal of this review article is to describe the basic anatomical and functional information of the LA as well as their study employing the main imaging techniques currently available, so that practitioners specializing in cardiac imaging techniques can use these tools in an accurate and clinically useful manner.
4
Tore, Davide, Riccardo Faletti, Andrea Biondo, Andrea Carisio, Fabio Giorgino, Ilenia Landolfi, Katia Rocco, et al. "Role of Cardiovascular Magnetic Resonance in the Management of Atrial Fibrillation: A Review." Journal of Imaging 8, no. 11 (November 4, 2022): 300. http://dx.doi.org/10.3390/jimaging8110300.
Повний текст джерелаАнотація:
Atrial fibrillation (AF) is the most common arrhythmia, and its prevalence is growing with time. Since the introduction of catheter ablation procedures for the treatment of AF, cardiovascular magnetic resonance (CMR) has had an increasingly important role for the treatment of this pathology both in clinical practice and as a research tool to provide insight into the arrhythmic substrate. The most common applications of CMR for AF catheter ablation are the angiographic study of the pulmonary veins, the sizing of the left atrium (LA), and the evaluation of the left atrial appendage (LAA) for stroke risk assessment. Moreover, CMR may provide useful information about esophageal anatomical relationship to LA to prevent thermal injuries during ablation procedures. The use of late gadolinium enhancement (LGE) imaging allows to evaluate the burden of atrial fibrosis before the ablation procedure and to assess procedural induced scarring. Recently, the possibility to assess atrial function, strain, and the burden of cardiac adipose tissue with CMR has provided more elements for risk stratification and clinical decision making in the setting of catheter ablation planning of AF. The purpose of this review is to provide a comprehensive overview of the potential applications of CMR in the workup of ablation procedures for atrial fibrillation.
5
Floria, Mariana, Smaranda Radu, Evelina Maria Gosav, Dragos Cozma, Ovidiu Mitu, Anca Ouatu, Daniela Maria Tanase, Viorel Scripcariu, and Lacramioara Ionela Serban. "Left Atrial Structural Remodelling in Non-Valvular Atrial Fibrillation: What Have We Learnt from CMR?" Diagnostics 10, no. 3 (March 2, 2020): 137. http://dx.doi.org/10.3390/diagnostics10030137.
Повний текст джерелаАнотація:
Left atrial structural, functional and electrical remodelling are linked to atrial fibrillation (AF) pathophysiology and mirror the phrase “AF begets AF”. A structurally remodelled left atrium (LA) is fibrotic, dysfunctional and enlarged. Fibrosis is the hallmark of LA structural remodelling and is associated with increased risk of stroke, heart failure development and/or progression and poorer catheter ablation outcomes with increased recurrence rates. Moreover, increased atrial fibrosis has been associated with higher rates of stroke even in sinus-rhythm individuals. As such, properly assessing the fibrotic atrial cardiomyopathy in AF patients becomes necessary. In this respect, late-gadolinium enhancement cardiac magnetic resonance (LGE-CMR) imaging is the gold standard in imaging myocardial fibrosis. LA structural remodelling extension offers both diagnostic and prognostic information and influences therapeutic choices. LGE-CMR scans can be used before the procedure to better select candidates and to aid in choosing the ablation technique, during the procedure (full CMR-guided ablations) and after the ablation (to assess the ablation scar). This review focuses on imaging several LA structural remodelling CMR parameters, including size, shape and fibrosis (both extension and architecture) and their impact on procedure outcomes, recurrence risk, as well as their utility in relation to the index procedure timing.
6
Shams, Khaled A. "When the left atrium becomes a monster: a case report." European Heart Journal - Case Reports 4, no. 4 (June 17, 2020): 1–4. http://dx.doi.org/10.1093/ehjcr/ytaa128.
Повний текст джерелаАнотація:
Abstract Background Congenital left atrium (LA) aneurysms are extremely rare entities in clinical practice and most frequently involve the atrial appendage and rarely arise from the body of LA, We report a case of giant LA aneurysm compressing heart and presenting in a very late stage. Case summary A 31-year-old male, who was diagnosed to have dextrocardia, rheumatic heart disease, and atrial fibrillation and was kept on medical treatment long time ago, presented with congestive heart failure symptoms and cardiogenic shock. Emergency transthoracic echocardiography was done revealing situs solitus with aneurysmally dilated LA pushing heart to the right side (dextro-posed heart), moderate mitral regurgitation, and severe pulmonary hypertension, however, pulmonary artery anatomy could not be properly visualized so computed tomography (CT) was preformed confirming diagnosis and revealing compressed pulmonary arterial tree by the dilated LA, unfortunately patient died before proceeding to surgical intervention. Discussion Congenital left atrial aneurysms are extremely rare anomaly and may be associated with significant morbidity. And, therefore, should be remembered as a potential anatomic cause of atrial arrhythmias or embolic phenomena, or both. The diagnosis may be easily established through non-invasive complementary techniques, such as echocardiography, CT, and cardiac magnetic resonance imaging. Symptomatic patients, those with large aneurysm or compelling indications for surgery should undergo surgical resection.
7
Haemers, Peter, Piet Claus, and Rik Willems. "The Use of Cardiac Magnetic Resonance Imaging in the Diagnostic Workup and Treatment of Atrial Fibrillation." Cardiology Research and Practice 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/658937.
Повний текст джерелаАнотація:
Atrial fibrillation (AF) is the most common cardiac arrhythmia and imposes a huge clinical and economic burden. AF is correlated with an increased morbidity and mortality, mainly due to stroke and heart failure. Cardiovascular imaging modalities, including echocardiography, computed tomography (CT), and cardiovascular magnetic resonance (CMR), play a central role in the workup and treatment of AF. One of the major advantages of CMR is the high contrast to noise ratio combined with good spatial and temporal resolution, without any radiation burden. This allows a detailed assessment of the structure and function of the left atrium (LA). Of particular interest is the ability to visualize the extent of LA wall injury. We provide a focused review of the value of CMR in identifying the underlying pathophysiological mechanisms of AF, its role in stroke prevention and in the guidance of radiofrequency catheter ablation. CMR is a promising technique that could add valuable information for therapeutic decision making in specific subpopulations with AF.
8
Peters, Dana C., Jérôme Lamy, Albert J. Sinusas, and Lauren A. Baldassarre. "Left atrial evaluation by cardiovascular magnetic resonance: sensitive and unique biomarkers." European Heart Journal - Cardiovascular Imaging 23, no. 1 (October 29, 2021): 14–30. http://dx.doi.org/10.1093/ehjci/jeab221.
Повний текст джерелаАнотація:
Abstract Left atrial (LA) imaging is still not routinely used for diagnosis and risk stratification, although recent studies have emphasized its importance as an imaging biomarker. Cardiovascular magnetic resonance is able to evaluate LA structure and function, metrics that serve as early indicators of disease, and provide prognostic information, e.g. regarding diastolic dysfunction, and atrial fibrillation (AF). MR angiography defines atrial anatomy, useful for planning ablation procedures, and also for characterizing atrial shapes and sizes that might predict cardiovascular events, e.g. stroke. Long-axis cine images can be evaluated to define minimum, maximum, and pre-atrial contraction LA volumes, and ejection fractions (EFs). More modern feature tracking of these cine images provides longitudinal LA strain through the cardiac cycle, and strain rates. Strain may be a more sensitive marker than EF and can predict post-operative AF, AF recurrence after ablation, outcomes in hypertrophic cardiomyopathy, stratification of diastolic dysfunction, and strain correlates with atrial fibrosis. Using high-resolution late gadolinium enhancement (LGE), the extent of fibrosis in the LA can be estimated and post-ablation scar can be evaluated. The LA LGE method is widely available, its reproducibility is good, and validations with voltage-mapping exist, although further scan–rescan studies are needed, and consensus regarding atrial segmentation is lacking. Using LGE, scar patterns after ablation in AF subjects can be reproducibly defined. Evaluation of ‘pre-existent’ atrial fibrosis may have roles in predicting AF recurrence after ablation, predicting new-onset AF and diastolic dysfunction in patients without AF. LA imaging biomarkers are ready to enter into diagnostic clinical practice.
9
Moulki, Naeem, Aneeq Waqar, Nancy Schoenecker, Cara Joyce, and Mushabbar A. Syed. "EFFECTS OF ATRIAL FIBRILLATION ABLATION ON LEFT ATRIAL FUNCTION AS EVALUATED ON CARDIAC MAGNETIC RESONANCE IMAGING." Journal of the American College of Cardiology 75, no. 11 (March 2020): 280. http://dx.doi.org/10.1016/s0735-1097(20)30907-4.
Повний текст джерела
10
Thosani, Amit J., Paul Gerczuk, Emerson Liu, William Belden, and Robert Moraca. "Closed Chest Convergent Epicardial–Endocardial Ablation of Non-paroxysmal Atrial Fibrillation – A Case Series and Literature Review." Arrhythmia & Electrophysiology Review 2, no. 1 (2013): 65. http://dx.doi.org/10.15420/aer.2013.2.1.65.
Повний текст джерелаАнотація:
The closed chest convergent procedure is a multidisciplinary approach to atrial fibrillation (AF) treatment. Epicardial posterior left atrial (PLA) ablation is performed by a cardiac surgeon using a transdiaphragmatic endoscope, immediately followed by percutaneous pulmonary vein (PV) isolation performed by a cardiac electrophysiologist. Interim outcomes for the treatment of non-paroxysmal AF (NPAF) were evaluated based on peri-procedural safety and complications, freedom from recurrent AF, and need for cardioversion or repeat catheter ablation at three, six and 12 months post-procedure. A total of 43 patients (86 % NPAF) underwent the convergent procedure. Patients were 84 % male, with mean age 58.6 ± 8.7 years. Mean AF duration was 45.4 ± 40.3 months. Pre-procedure left atrium (LA) volumetric data using cardiac magnetic resonance imaging (MRI) or computed tomography (CT) was available for 30 patients (70 %). Average LA volume was 155.5 ± 48.4 millilitres (ml); two-thirds of patients had a LA volume >130 ml. There was no operative or peri-operative mortality. Sinus rhythm (SR) was recorded at three months in 31 of 39 (79 %) patients, at six months in 24 of 27 (89 %) patients and at 12 months in nine patients. The convergent procedure is a safe and effective option for both PV isolation and PLA substrate ablation in NPAF patients. Long-term follow-up is required and randomised clinical trials warranted.
Дисертації з теми "Left atrium; atrial fibrillation; cardiac magnetic resonance imaging"
1
Champ-Rigot, Laure. "Nouvelles perspectives diagnostiques et thérapeutiques dans la prise en charge rythmologique des patients en situation d'insuffisance cardiaque Rationale and Design for a Monocentric Prospective Study: Sleep Apnea Diagnosis Using a Novel Pacemaker Algorithm and Link With Aldosterone Plasma Level in Patients Presenting With Diastolic Dysfunction (SAPAAD Study) Usefulness of sleep apnea monitoring by pacemaker sensor in elderly patients with diastolic dysfunction : the SAPAAD Study Clinical outcomes after primary prevention defibrillator implantation are better predicted when the left ventricular ejection fraction is assessed by magnetic resonance imaging Predictors of clinical outcomes after cardiac resynchronization therapy in patients ≥75 years of age: a retrospective cohort study Comparison between novel and standard high-density 3D electro-anatomical mapping systems for ablation of atrial tachycardia Safety and acute results of ultra-high density mapping to guide catheter ablation of atrial arrhythmias in heart failure patients Long-term clinical outcomes after catheter ablation of atrial arrhythmias guided by ultra-high density mapping system in heart failure patients." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC430.
Повний текст джерелаАнотація:
L’insuffisance cardiaque est un problème de santé publique dans les pays développés, touchant 1 à 2% de la population générale, mais dont la prévalence atteint 10% après 70 ans. Les progrès thérapeutiques ont permis d’améliorer le pronostic des patients, notamment ceux ayant une altération de la fonction systolique ventriculaire gauche. Les troubles du rythme sont fréquents et nécessitent une pris en charge particulière au cours des situations d’insuffisance cardiaque. Cependant, il reste des questions non résolues : comment améliorer l’efficacité du traitement de l’insuffisance cardiaque à fonction systolique préservée, comment mieux sélectionner les patients pouvant bénéficier de la prévention primaire de la mort subite par un défibrillateur implantable, les patients âgés peuvent-ils bénéficier de la même prise en charge que les patients plus jeunes, et pour finir comment améliorer les résultats de l’ablation de fibrillation auriculaire dans les situations d’insuffisance cardiaque. Nous avons mis en place une étude prospective chez des patients présentant une dysfonction diastolique pour évaluer l’intérêt de l’algorithme de surveillance de l’apnée du sommeil disponible dans des stimulateurs cardiaques. En parallèle, nous avons analysé l’impact de l’évaluation par résonance magnétique des patients candidats à un défibrillateur sur la prédiction des évènements rythmiques, mais aussi le devenir des patients de plus de 75 ans appareillés avec un système de resynchronisation cardiaque. Enfin, nous nous sommes intéressés aux résultats d’un nouveau système de cartographie électroanatomique ultra-haute densité pour guider les procédures d’ablation de troubles du rythme supraventriculaires complexes chez des patients insuffisants cardiaques comparés à des patients contrôlesHeart failure is a major public health issue in developed countries, with a prevalence of 1-2% of global population, rising to 10% after 70 years of age. Therapeutic progresses have succeeded in improving patients’ prognosis, particularly in case of reduced left ventricular ejection fraction. Rhythm abnormalities are frequent, and need special consideration in case of heart failure. Meanwhile, there are still some gaps in the evidence: heart failure with preserved systolic function is complex and difficult to treat, primary prevention of sudden cardiac death is effective but there is a need to better select candidates, whether elderly patients should be treated as younger individuals, and finally how to improve outcomes of atrial fibrillation catheter ablation. Firstly, we have conducted a prospective study to evaluate the Sleep Apnea Monitoring algorithm provided in a novel pacemaker in patients with diastolic dysfunction. Besides, we analyzed whether magnetic resonance imaging could predict cardiac outcomes in patients with an implantable cardioverter defibrillator better than echocardiography. We also reported the outcomes of the cardiac resynchronization therapy in patients ≥75 years old compared to younger patients. Finally, we studied the results of a novel ultra-high density mapping system to guide ablation procedures of complex atrial arrhythmias in heart failure patients compared to controls
2
Huber, Adrian Thomas. "Multi-organ non-invasive tissue characterization of fibrosis, adipose tissue, edema and inflammation with magnetic resonance (MR) imaging : applications to myocardium, skeletal muscle and liver interactions Cardiac MR strain: a noninvasive biomarker of fibro-fatty remodeling of the left atrial myocardium Comparison of MR T1 and T2 mapping parameters to characterize myocardial and skeletal muscle involvement in systemic Idiopathic Inflammatory Myopathy (IIM) Non-invasive differentiation of acute viral myocarditis and idiopathic inflammatory myopathy with cardiac involvement using magnetic resonance imaging T1 and T2 mapping CT predicts liver fibrosis: Prospective evaluation of morphology- and attenuationbased quantitative scores in routine portal venous abdominal scans." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS135.
Повний текст джерелаАнотація:
Cette thèse réalise une preuve de concept pour quantifier la déformation de l’oreillette gauche (OG) en IRM, ainsi que la relaxométrie IRM dans le myocarde, dans les muscles squelettiques et dans le foie. Grâce à l’interaction entre radiologues et ingénieurs, deux logiciels différents ont été développés, appliqués et validés pour l'analyse de la déformation myocardique multi-chambre et pour la cartographie quantitative du T1 multi-organes. La première publication a montré une forte corrélation de la déformation de l’OG, avec le degré de remplacement fibro-graisseux en histologie. Ce biomarqueur d'imagerie fonctionnelle est prometteur, puisque le remodelage structurel du myocarde est un substrat morphologique connu du dysfonctionnement électro-physiologique et de la fibrillation atriale. La deuxième publication a démontré l'influence de la composition et de la vascularisation de différents tissus sur les paramètres cartographiques T1. ΔT1 (prise de contraste musculaire relative) et EHF (prise de contraste musculaire normalisée par la prise de contraste dans le sang) ont été introduits comme alternatives simples au volume extracellulaire (ECV). Dans la troisième publication, les paramètres de relaxométrie appliqués aux muscles squelettiques ont permis une discrimination entre patients avec myocardite aiguë et patients avec des myosites systémiques. La quatrième publication a introduit le T1 du foie pour quantifier l’insuffisance cardiaque chez des patients avec des cardiomyopathies idiopathiques dilatées, montrant de meilleures performances que les paramètres fonctionnels établis tels que les volumes, la fraction d'éjection ou la déformation myocardiqueThis thesis provides a proof of concept for MR atrial strain, as well as MR relaxometry in the myocardium, in skeletal muscles and in the liver. Thanks to a close interaction between radiologist and software engineers, two different softwares were developed, applied and validated: one for multiorgan T1 mapping in the myocardium, skeletal muscle and liver, another one for cardiac four-chamber strain analysis and volumetry. The first publication showed a strong correlation of LA strain with the degree of fibro-fatty replacement in histology. Such functional imaging biomarker in combination with LA volumetry could help to guide clinical decisions, since myocardial structural remodeling is a known morphologic substrate of LA dysfunction, atrial fibrillation and adverse outcome. In the second publication, MR relaxometry parameters applied to the myocardium and skeletal muscles in IIM patients and healthy volunteers were used as a model to demonstrate influences of different tissue composition and vascularization on T1 mapping parameters. ΔT1 and EHF were introduced as simple alternatives to ECV in highly vascularized tissues such as the myocardium. In the third publication, MR relaxometry parameters applied to the skeletal muscls allowed for an accurate discrimination of AVM and IIM with cardiac involvement. However, when applied to the myocardium, parametric mapping did not separate between the two groups. The fourth publication introduced native T1 of the liver an easily accessible and accurate non-invasive imaging associate of congestive HF in IDCM patients with better performance than established functional parameters such as LV volumes, ejection fraction or strain
3
Molaee, Payman. "Assessment of left atrial structure and function in the setting of atrial fibrillation using cardiac magnetic resonance imaging." Thesis, 2012. http://hdl.handle.net/2440/76646.
Повний текст джерелаАнотація:
Atrial fibrillation (AF) is the most common sustained arrhythmia and is associated with significant morbidity and mortality. As a result of AF, patients develop palpitations, syncope, cardiac failure and thromboembolic complications. The management of AF has revolved around the issues of rate versus rhythm control, and stroke prevention. Although rhythm control was thought to be the most desirable approach, several large randomised trials failed to show a significant difference between the two treatment strategies. In fact, rhythm control strategy may be associated with increased adverse outcomes. This has largely been attributed to the poor efficacy and significant toxicity of antiarrhythmic agents. Since the seminal observation that the pulmonary veins play an important role in triggering AF, radiofrequency catheter ablation of AF has evolved rapidly. Although this is a potentially curative treatment for selected patients with AF, there are several issues that need to be addressed, including predictors of success of the procedure, effects of ablation on cardiac structure and function, and implications of AF ablation for long-term stroke risk. Cardiac magnetic resonance imaging (CMR) is now regarded as the “gold standard” non-invasive imaging modality for the assessment of cardiac structure and function. It is thus an ideal tool for initial assessment and follow-up of patients with AF undergoing ablation. The chapters in this thesis are based on CMR studies in patients with AF. Left atrial (LA) volume is an established prognostic marker. Currently, LA volume is commonly measured using the biplane area-length method and applying the method of discs. This involves geometric assumptions, which may introduce inaccuracies. In Chapter 3, the accuracy and reproducibility of biplane area-length method was compared with the “gold standard” volumetric measurement using CMR, in healthy controls and subjects with AF. The biplane area-length method correlated well with the volumetric method in healthy controls, but in subjects with AF, the correlation was less robust and the area-length method was less reproducible. Traditionally, “lone” AF has been defined as the occurrence of AF in the absence of any
cardiopulmonary disease. However, the CMR study presented in Chapter 4 demonstrates that despite having no evidence of cardiac abnormalities on echocardiography, subjects with “lone” AF have atrial functional abnormalities and ventricular structural changes compared with controls. The success of AF ablation can be variable depending on the expertise of the centre, clinical and imaging characteristics. Predictors of success following AF ablation have not been well established. The clinical and CMR factors associated with medium-term outcomes following AF ablation are presented in Chapter 5. Following multivariate analysis, increased LA volume and female gender were the only predictors of AF recurrence at one year post-ablation. In the study presented in Chapter 6, CMR was performed at baseline and 12-month follow-up to assess the impact of AF ablation on cardiac structure and function. In subjects with successful ablation, there was evidence of reverse remodelling within the atria and ventricles, with reduction in chamber volumes post-ablation. Importantly, these changes associated with cardiac reverse remodelling after ablation may indeed contribute to the success of ablation.Thesis (Ph.D.) -- University of Adelaide, School of Medicine, 2012
4
Wandelt, Laura Kristin. "Magnetresonanztomographische Detektion von Fibrose im linken Vorhof bei Patienten nach Schlaganfall." Doctoral thesis, 2019. http://hdl.handle.net/21.11130/00-1735-0000-0003-C15E-A.
Повний текст джерелаЧастини книг з теми "Left atrium; atrial fibrillation; cardiac magnetic resonance imaging"
1
Razavi, Reza, Manav Sohal, Zhong Chen, and James Harrison. "New technical developments in CMR." In The ESC Textbook of Cardiovascular Imaging, 107–15. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780198703341.003.0008.
Повний текст джерелаАнотація:
Technical developments in cardiac magnetic resonance (CMR) are changing our practice and opening up new avenues of research and clinical application. In this chapter three important areas are addressed that are moving from research into important clinical applications. First, the use of quantitative T1 mapping in characterizing myocardial tissue, particularly of the left ventricle. This area has expanded substantially over the last few years and T1 mapping techniques are now being used to study a number of conditions, including myocardial infarction and different cardiomyopathies. Second, the area of atrial imaging and the use of gadolinium late-enhancement and T2-weighted imaging to characterize the morphology of the left atrium. This has become increasingly important in the assessment of patients with atrial fibrillation, both as a way of classifying patients in terms of the severity of atrial disease and the likelihood of response to catheter ablation therapies, and also as a way of assessing the effects of these ablation therapies particularly when patients require redo procedures. Finally, the use of MRI conditional pacemakers, which have become available and now allow patients with pacemakers to undergo MRI studies.
2
Kovács, Sándor J. "The heart as a pump: governing principles." In ESC CardioMed, edited by Guido Grassi, 111–15. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0021.
Повний текст джерелаАнотація:
The pumping attributes of the heart remain active topics of investigation and mastery of how the heart functions as a pump is part of the fund of knowledge of physiologists and cardiologists. The advent of high-resolution, real-time imaging (computed tomography, magnetic resonance imaging cardiac catheterization, two- and three-dimensional echocardiography) has continued to advance our understanding of how the four-chambered heart (left heart, right heart) works as it fills and as it empties. The insights that have evolved emanate from a conceptual framework based on motion (kinematics) of selected phases and portions of the four-chambered heart and the contents of the pericardial sac. Concepts include pressure pumping, volume pumping, constant-volume pumping, the relationship between atrial and ventricular function and atrial and ventricular indexes, the role of the heart as a suction pump, laws that govern isovolumic relaxation, and the relationship of intraventricular fluid mechanics to diastolic function and wall motion. Accordingly, by asking such questions as ‘What is the ejection fraction of the pericardial sack, and why does it have the numerical value it has?’ or ‘Why does the left atrium fill in two phases—one in systole and one in diastole?’ or ‘How is atrial conduit volume related to diastolic wall motion?’ one can gain new insights into pumping function. This chapter presents a simple, useful, yet powerful conceptual framework that can be used descriptively or mathematically to addresses these and other clinically important themes.
3
Kovács, Sándor J. "The heart as a pump: governing principles." In ESC CardioMed, edited by Guido Grassi, 111–15. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0021_update_001.
Повний текст джерелаАнотація:
The pumping attributes of the heart remain active topics of investigation and mastery of how the heart functions as a pump is part of the fund of knowledge of physiologists and cardiologists. The advent of high-resolution, real-time imaging (computed tomography, magnetic resonance imaging cardiac catheterization, two- and three-dimensional echocardiography) has continued to advance our understanding of how the four-chambered heart (left heart, right heart) works as it fills and as it empties. The insights that have evolved emanate from a conceptual framework based on motion (kinematics) of selected phases and portions of the four-chambered heart and the contents of the pericardial sac. Concepts include pressure pumping, volume pumping, constant-volume pumping, the relationship between atrial and ventricular function and atrial and ventricular indexes, the role of the heart as a suction pump, laws that govern isovolumic relaxation, and the relationship of intraventricular fluid mechanics to diastolic function and wall motion. Accordingly, by asking such questions as ‘What is the ejection fraction of the pericardial sack, and why does it have the numerical value it has?’ or ‘Why does the left atrium fill in two phases—one in systole and one in diastole?’ or ‘How is atrial conduit volume related to diastolic wall motion?’ one can gain new insights into pumping function. This chapter presents a simple, useful, yet powerful conceptual framework that can be used descriptively or mathematically to addresses these and other clinically important themes.
4
Kovács, Sándor J. "The heart as a pump: governing principles." In ESC CardioMed, edited by Guido Grassi, 111–15. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780198784906.003.0021_update_002.
Повний текст джерелаАнотація:
The pumping attributes of the heart remain active topics of investigation and mastery of how the heart functions as a pump is part of the fund of knowledge of physiologists and cardiologists. The advent of high-resolution, real-time imaging (computed tomography, magnetic resonance imaging cardiac catheterization, two- and three-dimensional echocardiography) has continued to advance our understanding of how the four-chambered heart (left heart, right heart) works as it fills and as it empties. The insights that have evolved emanate from a conceptual framework based on motion (kinematics) of selected phases and portions of the four-chambered heart and the contents of the pericardial sac. Concepts include pressure pumping, volume pumping, constant-volume pumping, the relationship between atrial and ventricular function and atrial and ventricular indexes, the role of the heart as a suction pump, laws that govern isovolumic relaxation, and the relationship of intraventricular fluid mechanics to diastolic function and wall motion. Accordingly, by asking such questions as ‘What is the ejection fraction of the pericardial sack, and why does it have the numerical value it has?’ or ‘Why does the left atrium fill in two phases—one in systole and one in diastole?’ or ‘How is atrial conduit volume related to diastolic wall motion?’ one can gain new insights into pumping function. This chapter presents a simple, useful, yet powerful conceptual framework that can be used descriptively or mathematically to addresses these and other clinically important themes.
Тези доповідей конференцій з теми "Left atrium; atrial fibrillation; cardiac magnetic resonance imaging"
1
Reis, Ana Luísa Lopes Espínola da Costa, Leonardo Henrique Gandolfi de Souza, and Vitor Roberto Pugliesi Marques. "Ischemic stroke with agraphestesia signal focus." In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.470.
Повний текст джерелаАнотація:
Introduction: The ischemic stroke is one of the main causes of death and disability in Brazil. Among the main risk factors are age, atrial fibrillation (AF), diabetes, dyslipidemia and physical inactivity. The main etiology of stroke is cardioembolic, resulting in obstruction of the cerebral arteries by a thrombus of cardiac origin. The artery most affected in ischemic strokes is the middle cerebral artery. The stroke has main characteristics, with emphasis on the sudden onset of symptoms, involvement of a focal area, ischemia caused by obstruction of a vessel and neurological deficits depending on the affected area. Graphesthesia is defined as a cutaneous sensory ability to recognize letters or numbers traced on the skin. The loss of this sensory ability is known as agraphesthesia. Case Report: M.A.F.O. female, 78a, arrived at the UPA complaining of mental confusion. Patient denies previous stroke. Personal history of systemic arterial hypertension. Upon physical examination, the patient was conscious, self and disoriented and inattentive. He was able to repeat and evoke words, without measurable motor déficits. Left upper limb with agraphestesia. Computed tomography was requested, which showed an extensive hypodense area in the right parietoccipital region, which leads to the erasure of the furrows between the adjacent gyres, which may correspond to a recent ischemic event. Magnetic resonance imaging, diffusion-restricted area with correspondence on the ADC map, located in the right temporoparietal region inferring an acute ischemic event. An electrocardiogram was also requested, which showed an irregular rhythm, characteristic of atrial fibrillation, resulting in a diagnostic hypothesis of cardioembolic ischemic stroke. Discussion: The involvement of post-central ischemic gyrus lesions may correspond to paresthesia, anesthesia, hypoesthesia; the involvement of secondary and terciary areas of sensitivity in the upper parietal lobe, especially in the active movements of the hand and in the modalities of integrated sensitivity, their lesions may be clinically affected by: apraxias, dysgraphias, hemineglect, agraphestesia, stereoagnosia and spacial disorientation.