Download or read book Mathematical Modeling of Calcium Handling Dysfunctions Leading to Atrial Fibrillation written by Nikolina Krizanec and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this master s thesis is to study the basic cardiac cellular electrophysiology in order to understand and examine the role of SK3 channels. Among the many channels present in an atrial myocyte, SK3 channels are activated by calcium, providing the circulation of the intracellular calcium. A well established mathematical model, the Grandi model, forms the basis of the simulations presented in this project. First, to study the effect of the SK current, a modification of the atrial myocyte model is done. Secondly, the model is calibrated according to experimental results. Lastly, we study the effect of the SK currents to avoid spontaneous calcium release induced depolarizations. Numerical simulations of the whole-cell atrial myocyte performed in this project confirmed the anti arrhythmic behaviour of the SK current, that counteracts the effect of spontaneous calcium release. This effect is, however, not large and, therefore, does not seem to support the, development of SK channel blockers as a new therapeutic strategy in the treatment of atrial fibrillation, as has been suggested in the literature.
Download or read book Modelling Pathological Effects in Intracellular Calcium Dynamics Leading to Atrial Fibrillation written by Miquel Marchena Angos and published by . This book was released on 2020 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The heart beating is produced by the synchronization of the cardiac cells' contraction. A dysregulation in this mechanism may produce episodes of abnormal heart contraction. The origin of these abnormalities often lies at the subcellular level where calcium is the most important ion that controls the cell contraction. The regulation of calcium concentration is determined by the ryanodine receptors (RyR), the calcium channels that connect the cytosol and the sarcoplasmic reticulum. RyRs open and close stochastically with calcium-dependent rates. The fundamental calcium release event is known as calcium spark, which refers to a local release of calcium through one or more RyRs. Thus, a deep knowledge on both the spatio-temporal characteristics of the calcium patterns and the role of the RyRs is crucial to understand the transition between healthy to unhealthy cells. The aim of this Thesis has been to figure out these changes at the submicron scale, which may induce the transition to Atrial Fibrillation (AF) in advanced stages. To address this issue, I have developed, and validated, a subcellular mathematical model of an atrial myocyte which includes the electro-physiological currents as well as the fundamental intracellular structures. The high resolution of the model has allowed me to study the spatio-temporal calcium features that arise from both the cell stimulation and the resting conditions. Simulations show the relevance of the assembly of RyRs into clusters, leading to the formation of macro-sparks for heterogeneous distributions. These macro-sparks may produce ectopic beats under pathophysiological conditions. The incorporation of RyR-modulators into the model produces a nonuniform spatial distribution of calcium sparks, a situation observed during AF. In this sense, calsequestrin (CSQ) has emerged as a key calcium buffer that modifies the calcium handling. The lack of CSQ produces an increase in the spark frequency and, during calcium overload, it also promotes the appearance of global calcium oscillations. Finally, I have also characterized the effect of detubulation, a common issue in cells with AF and heart failure. Thus, the present work represents a step forward in the understanding of the mechanisms leading to AF, with the development of computational models that, in the future, can be used to complement in vitro or in vivo studies, helping find therapeutic targets for this disease.
Download or read book The Role of Calcium Handling in Heart Failure and Heart Failure Associated Arrhythmias written by Elisabetta Cerbai and published by Frontiers Media SA. This book was released on 2019-05-15 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under normal, healthy conditions, the contraction of cardiac myocytes, leading to the pump function of this organ, is driven by calcium-dependent mechanisms. Entry of calcium into the myocyte during the cardiac action potential causes activation of the ryanodine receptors and release of calcium from the sarcoplasmic reticulum. This process termed calcium-induced calcium release is essential for excitation-contraction coupling and enables each action potential to be transduced into a mechanical event. Indeed, in healthy myocytes, the calcium concentration in the cytosol of is elevated approximately 10-fold from a resting level of ∼100 nM to ∼1 μM. This process is finely orchestrated by a number of key proteins, which can be specifically regulated by various pathways depending on the oxygen demand. Furthermore, the specific structure of the myocyte allows certain calcium-dependent processes to be compartmentalised, increasing the efficiency and safety of this regulation. Heart failure is a common, costly, and life-threatening condition. In 2015, for example, it affected around 40 million people globally. In patients with heart failure, the risk of sudden cardiac death and arrhythmias increases substantially. Cellular remodelling and alterations in calcium handling, which appear to contribute to the arrhythmogenic burden in heart failure, have been extensively reported. However, a number of unanswered questions remain, and each new study - while continuing to shed light on this subject - raises additional novel questions. This current compendium of articles covers a number of aspects and comprehensively reviews current knowledge and perspectives regarding the link between calcium handling, arrhythmias and heart failure providing at the same time insights that may lead to novel therapeutic options for the future.
Download or read book Advances In Electrocardiology 2004 Proceedings Of The 31th International Congress On Electrocardiology written by Masayasu Hiraoka and published by World Scientific. This book was released on 2005-04-13 with total page 891 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrocardiology has witnessed a century of development since the introduction of Einthoven's Galvanometer. With rapid progress in the scientific, technological and clinical aspects of the field of electrocardiology in recent years, electrocardiology now covers a wide range of topics from molecules as the electrical origin of the heart to diagnostic and therapeutic applications for cardiovascular diseases. This volume presents the latest information and developments in the field, from basic science to clinical electrocardiology. A wide range of topics are covered, including molecular biology, genetics, channelopathy, atrial fibrillation, catheter ablation, modeling of cardiac electrical activity, cardiac mapping, as well as diagnosis, treatment and prevention of cardiac disease and arrhythmic disorders.Contributors to the volume include leading experts in the field such as PJ Schwartz, C Antzelevitch, Y Rudy, HJGM Vrijin, DG Escande, AAM Wilde, DA Kass, J Jalife and A d'Avila. The book is an essential source of reference for cardiologists and electrocardiologists.
Download or read book Recent Advances in Understanding the Basic Mechanisms of Atrial Fibrillation Using Novel Computational Approaches written by Jichao Zhao and published by Frontiers Media SA. This book was released on 2019-11-25 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The ESC Textbook of Cardiovascular Medicine written by European Society of Cardiology and published by Oxford University Press, USA. This book was released on 2009-08-27 with total page 1423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the structure and format of the ESC core syllabus, this text introduces key concepts in the field of cardiovascular medicine.
Download or read book Cardiac Electrophysiology from Cell to Bedside written by Douglas P. Zipes and published by Elsevier Health Sciences. This book was released on 2013-10-25 with total page 1395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cardiac Electrophysiology: From Cell to Bedside puts the latest knowledge in this subspecialty at your fingertips, giving you a well-rounded, expert grasp of every cardiac electrophysiology issue that affects your patient management. Drs. Zipes, Jalife, and a host of other world leaders in cardiac electrophysiology use a comprehensive, multidisciplinary approach to guide you through all of the most recent cardiac drugs, techniques, and technologies. Get well-rounded, expert views of every cardiac electrophysiology issue that affects your patient management from preeminent authorities in cardiology, physiology, pharmacology, pediatrics, biophysics, pathology, cardiothoracic surgery, and biomedical engineering from around the world. Visually grasp and easily absorb complex concepts through an attractive full-color design featuring color photos, tables, flow charts, ECGs, and more! Integrate the latest scientific understanding of arrhythmias with the newest clinical applications, to select the right treatment and management options for each patient. Stay current on the latest advancements and developments with sweeping updates and 52 NEW chapters - written by many new authors - on some of the hottest cardiology topics, such as new technologies for the study of the molecular structure of ion channels, molecular genetics, and the development of new imaging, mapping and ablation techniques. Get expert advice from Dr. Douglas P. Zipes - a leading authority in electrophysiology and editor of Braunwald's Heart Disease and the Heart Rhythm Journal - and Dr. Jose Jalife - a world-renowned leader and researcher in basic and translational cardiac electrophysiology. Access the full text online at Expert Consult, including supplemental text, figures, tables, and video clips. Your purchase entitles you to access the web site until the next edition is published, or until the current edition is no longer offered for sale by Elsevier, whichever occurs first. If the next edition is published less than one year after your purchase, you will be entitled to online access for one year from your date of purchase. Elsevier reserves the right to offer a suitable replacement product (such as a downloadable or CD-ROM-based electronic version) should online access to the web site be discontinued.
Download or read book Disease Control Priorities Third Edition Volume 5 written by Dorairaj Prabhakaran and published by World Bank Publications. This book was released on 2017-11-17 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cardiovascular, respiratory, and related conditions cause more than 40 percent of all deaths globally, and their substantial burden is rising, particularly in low- and middle-income countries (LMICs). Their burden extends well beyond health effects to include significant economic and societal consequences. Most of these conditions are related, share risk factors, and have common control measures at the clinical, population, and policy levels. Lives can be extended and improved when these diseases are prevented, detected, and managed. This volume summarizes current knowledge and presents evidence-based interventions that are effective, cost-effective, and scalable in LMICs.
Download or read book Cardiac Electrophysiology From Cell to Bedside E Book written by Douglas P. Zipes and published by Elsevier Health Sciences. This book was released on 2013-10-11 with total page 1397 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cardiac Electrophysiology: From Cell to Bedside puts the latest knowledge in this subspecialty at your fingertips, giving you a well-rounded, expert grasp of every cardiac electrophysiology issue that affects your patient management. Drs. Zipes, Jalife, and a host of other world leaders in cardiac electrophysiology use a comprehensive, multidisciplinary approach to guide you through all of the most recent cardiac drugs, techniques, and technologies. Consult this title on your favorite e-reader, conduct rapid searches, and adjust font sizes for optimal readability. Compatible with Kindle®, nook®, and other popular devices. Get well-rounded, expert views of every cardiac electrophysiology issue that affects your patient management from preeminent authorities in cardiology, physiology, pharmacology, pediatrics, biophysics, pathology, cardiothoracic surgery, and biomedical engineering from around the world. Visually grasp and easily absorb complex concepts through an attractive full-color design featuring color photos, tables, flow charts, ECGs, and more! Integrate the latest scientific understanding of arrhythmias with the newest clinical applications, to select the right treatment and management options for each patient. Stay current on the latest advancements and developments with sweeping updates and 52 NEW chapters - written by many new authors - on some of the hottest cardiology topics, such as new technologies for the study of the molecular structure of ion channels, molecular genetics, and the development of new imaging, mapping and ablation techniques. Get expert advice from Dr. Douglas P. Zipes - a leading authority in electrophysiology and editor of Braunwald’s Heart Disease and the Heart Rhythm Journal - and Dr. Jose Jalife - a world-renowned leader and researcher in basic and translational cardiac electrophysiology. Access the full text online at Expert Consult, including supplemental text, figures, tables, and video clips.
Download or read book Cardiac Mechano Electric Coupling and Arrhythmias written by Peter Kohl and published by OUP Oxford. This book was released on 2011-08-25 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cardiac Mechano-Electric Coupling and Arrhythmias offers a thoroughly reviewed compendium written by leading experts in the field on the mechanism and consequences of cardiac mechano-electrical coupling. Its coverage ranges from stretch-activated ion channels to mechanically induced arrhythmias and mechanical interventions for heart rhythm correction. Information is grouped into logical sections, from molecular mechanisms, to cell, tissue and whole organ responses, right through to patient-based observations and insight emerging from clinical trials. The information provided carefully highlights both consensus insight and current shortcomings in our understanding of cardiac mechano-electric coupling. The book has been thoroughly revised and expanded since publication of the first edition in 2005, extensively updated to reflect recent developments in the field, and now offers a more balanced view of mechano-electrical interactions in the heart and develops a more clinical focus. Written with the practising cardiologist and junior doctor in mind, it offers interesting new insight for the established physician with an interest in cardiac arrhythmogenesis and heart rhythm management.
Download or read book Multiscale Modeling of Cardiac Electrophysiology Adaptation to Atrial and Ventricular Rhythm Disorders and Pharmacological Treatment written by Mathias Wilhelms and published by KIT Scientific Publishing. This book was released on 2014-05-22 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiscale modeling of cardiac electrophysiology helps to better understand the underlying mechanisms of atrial fibrillation, acute cardiac ischemia and pharmacological treatment. For this purpose, measurement data reflecting these conditions have to be integrated into models of cardiac electrophysiology. Several methods for this model adaptation are introduced in this thesis. The resulting effects are investigated in multiscale simulations ranging from the ion channel up to the body surface.AbstractEnglisch = Multiscale modeling of cardiac electrophysiology helps to better understand the underlying mechanisms of atrial fibrillation, acute cardiac ischemia and pharmacological treatment. For this purpose, measurement data reflecting these conditions have to be integrated into models of cardiac electrophysiology. Several methods for this model adaptation are introduced in this thesis. The resulting effects are investigated in multiscale simulations ranging from the ion channel up to the body surface.
Download or read book Catheter Ablation of Atrial Fibrillation written by Etienne Aliot and published by John Wiley & Sons. This book was released on 2011-08-31 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catheter Ablation of Atrial Fibrillation Edited by Etienne Aliot, MD, FESC, FACC, FHRS Chief of Cardiology, Hôpital Central, University of Nancy, France Michel Haïssaguerre, MD Chief of Electrophysiology, Hôpital Cardiologique du Haut-Lévêque, France Warren M. Jackman, MD Chief of Electrophysiology, University of Oklahoma Health Science Center, USA In this text, internationally recognized authors explore and explain the advances in basic and clinical electrophysiology that have had the greatest impact on catheter ablation of atrial fibrillation (AF). Designed to assist in patient care, stimulate research projects, and continue the remarkable advances in catheter ablation of AF, the book covers: the fundamental concepts of AF, origin of signals, computer simulation, and updated reviews of ablation tools the present practical approaches to the ablation of specific targets in the fibrillating atria, including pulmonary veins, atrial neural network, fragmented electrograms, and linear lesions, as well as the strategies in paroxysmal or chronic AF or facing left atrial tachycardias the special challenge of heart failure patients, the impact of ablation on mortality, atrial mechanical function, and lessons from surgical AF ablation Richly illustrated by numerous high-quality images, Catheter Ablation of Atrial Fibrillation will help every member of the patient care team.
Download or read book Excitation Contraction Coupling and Cardiac Contractile Force written by Donald Bers and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: How is the heartbeat generated? What controls the strength of contraction of heart muscle? What are the links between cardiac structure and function? How does our understanding of skeletal and smooth muscle and non-muscle cells influence our thinking about force development in the heart? Are there important species differences in how contraction is regulated in the heart? How do the new molecular data fit together in understanding the heart beat? What goes wrong in ischemia, hypertrophy, and heart failure? This book paints a modern `portrait' of how the heart works and in this picture the author shows a close-up of the structural, biochemical, and physiological links between excitation and contraction. The author takes the reader through a series of important, interrelated topics with great clarity and continuity and also includes many useful illustrations and tables. The book starts by considering the cellular structures involved in excitation-contraction coupling and then described the characteristics of the myofilaments as the end effector of excitation-contraction coupling. A general scheme of calcium regulation is described and the possible sources and sinks of calcium are discussed in simple, but quantitative terms. The cardiac action potential and its many underlying currents are reviewed. Then the characteristics of some key calcium transport systems (calcium channels, sodium/calcium exchange and SR calcium uptake and release) are discussed in detail. This is then built into a more integrated picture of calcium regulation in succeeding chapters by detailed discussions of excitation-calcium coupling mechanisms (in skeletal, cardiac, and smooth muscle), the interplay between calcium regulatory processes, and finally mechanisms of cardiac inotropy, calcium overload, and dysfunction (e.g., ischemia, hypertrophy, and heart failure). Excitation-Contraction Coupling and Cardiac Contractile Force – Second Edition is an invaluable source of information for anyone who is interested in how the heart beat is controlled and especially suited for students of the cardiovascular system at all levels from medical/graduate students through senior investigators in related fields.
Download or read book Atrial Fibrillation written by Rodney H. Falk and published by Lippincott Williams & Wilkins. This book was released on 1997 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised edition offers guidance on evaluation and management of atrial fibrillation and describes pharmacological, electrophysical, and surgical therapies. Coverage includes revised chapters on echocardiography, anti-coagulant therapy, and catheter ablation, and new chapters on atrial flutter, basic electrophysiology of antiarrhythmic drugs, implantable atrial defibrillators, and conduction through the atrioventricular node. Also included are chapters on decision analysis in the treatment of atrial fibrillation and on the special problems of paroxysmal atrial fibrillation.
Download or read book Heart Rhythm Disorders written by J. Anthony Gomes and published by Springer Nature. This book was released on 2020-06-30 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: This engaging book covers a multitude of topics related to heart rhythm disorders (HRDs) and uniquely familiarizes readers with the development of treatment modalities over the past several decades, including the evolution of anti-arrhythmic drugs, pacemakers, defibrillators, and catheter ablation. Organized in ten sections, this title serves as both an archival and a contemporary resource for clinicians. The first section describes the discovery of the circulatory system by William Harvey in 1628 and outlines the development and understanding of HRD since the advent of intra-cardiac electrophysiology. Subsequent sections discuss the historical evolution of abnormal heart rhythms, such as supra and ventricular rhythms and sudden cardiac death, their treatment with drugs, surgery, pacemakers, implantable defibrillators and catheter ablation. Section nine offers a fascinating narration of the clinical evolution of overcoming heart attacks and its impact on HRDs. The final section explores potential new frontiers in HRD and the factors that may contribute to the prospective rise of cardiovascular diseases. A ground-breaking and invaluable addition to the clinical literature, Heart Rhythm Disorders: History, Mechanisms and Management Perspectives details the pervasive nature of cardiovascular diseases in human history, their ramifications, and their projected effects on at-risk demographic populations and human health in general.
Download or read book Research Grants Index written by National Institutes of Health (U.S.). Division of Research Grants and published by . This book was released on 1970 with total page 1404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atrial Fibrillation Technology for Diagnosis Monitoring and Treatment written by Jose F. Rodriguez Matas and published by Frontiers Media SA. This book was released on 2022-03-15 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt:
