Download or read book Effects of Right Ventricular Pacing and Its Interruption on Left Ventricular Torsional Mechanics and Diastolic Function in Congenital Heart Block written by Carline Koh and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Effects of Right Ventricular Pacing and Its Interruption on Left Ventricular Torsional Mechanics and Diastolic Function in Congenital Heart Block" by Carline, Koh, 許上冕, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b4516719 Subjects: Diastole (Cardiac cycle) Cardiac pacing Heart - Left ventricle Congenital heart disease
Download or read book Ventricular Mechanics in Congenital Heart Disease written by Giovanni Biglino and published by Frontiers Media SA. This book was released on 2017-08-29 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Looking at "Horse in Motion", the iconic photograph by E. Muybridge, it is almost possible to hear the horse galloping. The pounding sound of the hoofs hitting the ground -like a drum- can also echo the rythmic beating of the human heart. That sound, that visceral rhythm, reminds us of the link between motion and performance: the perfectly executed stride of the horse, the incredible coordination of multiscale phenomena behind a heart beat. Furthermore, the decomposed sequence in Muybridge's photograph has become a well-known example of breaking motion into its components over time, and as such is reminiscent of those images that are routinely acquired in clinical practice, where the heart appears dilating and shirnking in a sequence of snapshots. The investigation of this motion and its subtleties is essential for refining our understanding of cardiac function, and the appreciation of how and when this motion is no longer perfectly executed can lead us to understand functional impairments and provide insight into the unfolding of pathology. In the presence of congenital heart disease (CHD), cardiac mechanics are altered: from single ventricle physiology to conduction abnormalities to different cardiomyopathies, it is important to both capture and interpret biomechanical changes that occur in the presence of a congenital defect. This special issue in Frontiers in Pediatrics, now an e-book, focuses on 'Ventricular mechanics in congenital heart disease' and looks at current knowledge of phenomena such as systolic/diastolic dysfuction and current methods (chiefly in cardiovascular magnetic resonance imaging and echocardiography) to evaluate cardiac function in the presence of CHD, and then presents a series of original studies that employ both medical imaging and computational modelling techniques to study specific CHD scenarios.
Download or read book Ventricular Function and Blood Flow in Congenital Heart Disease written by Mark A. Fogel and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infants, children and adolescents with congenital heart disease(CHD) are a challenge to manage and an ever-increasing number arereaching adulthood. CHD is one of the most important topics in cardiology today, yetthis book is the only clinically-orientated monograph devotedexclusively to ventricular function and blood flow as it relates toCHD. Written by a distinguished panel of cardiologists, bioengineers,physiologists, and clinical investigators, Ventricular Functionand Blood Flow in Congenital Heart Disease is an extensive andcomprehensive presentation of the key aspects of this branch ofCHD.
Download or read book Cardiac Arrhythmias Advances in Research and Treatment 2013 Edition written by and published by ScholarlyEditions. This book was released on 2013-06-21 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cardiac Arrhythmias—Advances in Research and Treatment: 2013 Edition is a ScholarlyEditions™ book that delivers timely, authoritative, and comprehensive information about Ventricular Fibrillation. The editors have built Cardiac Arrhythmias—Advances in Research and Treatment: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Ventricular Fibrillation in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Cardiac Arrhythmias—Advances in Research and Treatment: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Effects of Pacing Site on Global and Regional Left Ventricular Function in the Setting of Dyssynchronous Heart Failure written by Elliot Jacob Howard and published by . This book was released on 2011 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Regional estimates of left ventricular function are important for understanding normal cardiac function. In the presence of electrical dyssynchrony and heart failure, substantial remodeling of left ventricular geometry and cellular function occurs, resulting in discoordinate mechanical contraction. However, the determinants of regional left ventricular function during altered electrical activation in the failing heart are unclear. Thus, we sought to investigate the effects of ventricular activation on left ventricular function in dyssynchronously failing hearts. Regional mechanics were measured in the anterolateral left ventricle in open-chest canine hearts. We found that the transmural location of the left ventricular pacing lead and its position in relation to the baseline activation sequence were important determinants of cardiac function. Specifically, improvements in hemodynamic function increased with activation time at the pacing site during endocardial, but not epicardial, biventricular pacing. At the inner wall, radial strain was increased during local endocardial pacing compared with epicardial pacing. In paced failing ventricles, regional differences in myofiber shortening were observed. End-systolic strains were significantly correlated with peak fiber prestretch. Additionally, the onset of sub-endocardial fiber relengthening and fiber shortening duration increased with local activation time, which may be due differences in fiber length. In model simulations, the effects of fiber length and shortening velocity on differences in fiber shortening magnitude, relengthening onset, and shortening duration were investigated. Removing both length and velocity dependence from the active stress model attenuated these differences, compared to baseline. Finally, we studied the effects of sheet structure and transmural activation sequence on regional function. Sheet angle was less radially oriented in failing hearts, compared with control, resulting in a reduced contribution of sheet extension. In failing hearts, reversal of the transmural activation sequence reduced the absolute magnitudes of sheet thickening and shearing at the inner wall, and altered the relative contributions to end-systolic wall thickening compared with normal. Overall, these findings provide insights into the mechanisms by which the amount of electrical dyssynchrony determines left ventricular function in the failing heart.
Download or read book Congenital Diseases in the Right Heart written by Andrew N. Redington and published by Springer Science & Business Media. This book was released on 2008-10-29 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Congenital Heart Disease in the Right Heart' is an exhaustive review of the malformations of the right ventricle with particular emphasis on the ability of the ventricle to support circulation and the results of right heart malformations on circulation. Edited by the world’s foremost authorities on the subject, the book benefits from an international team of contributors.
Download or read book Evolution of Left Ventricular Function and Its Tolerance of Tachycardia in Early Infancy written by Étienne Fortin-Pellerin and published by . This book was released on 2015 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background: The literature examining ventricular function of the neonate and young infant is fragmented. Furthermore, the clinical implications of the observed differences have been largely extrapolated from adult studies. Clinical echocardiography-based investigations at rest, for instance, have suggested the neonatal left ventricle (LV) rapidly improves its ability to relax within weeks of delivery. There is a paucity of data, however, on the functional reserve of the neonatal and young infant heart when facing hemodynamic stress. As reduced ventricular relaxation in the diseased adult heart is associated with poor tolerance to atrial tachycardia due in part to reduced filling time, it has been thought that the neonatal heart may be less tolerant to tachycardia than that of the infant. We sought to explore the impact of early LV maturation on its ability to tolerate atrial tachycardia. We hypothesized that the neonatal LV would be less tolerant of atrial tachycardia than that of the young infant equivalent. Methods: Under general anesthesia (propofol, isoflurane), neonatal (1-3days, NP) and infant (14-17days, YP) Landrace cross piglets (n=7 each) were instrumented intravascularly with Millar® high-fidelity and pacing catheters in the left ventricle and right atrium, respectively. Invasive hemodynamic and basic echocardiography parameters were acquired at baseline, and at 200, 230 and 260bpm. Speckle tracking technique was then used for different left ventricular deformation studies (i.e. strain, strain rate and twist). Results: At all rates, NP maintained their LV output and blood pressure, whereas YPs did not. Negative dP/dt was lower in NPs at baseline (-1599±83 vs. -2470±226mmHg/s, p=0.007) but increased with pacing (p=0.002). In contrast, YP baseline negative dp/dt was greater and tended to decrease with pacing (p=0.056). All other invasive measures of diastolic function (left ventricular end-diastolic pressure, tau and isovolumic relaxation time) did not differ between groups. Except for fractional shortening which was reduced in YP at 260bpm; all invasive and noninvasive measures of contractility did not differ between groups. Twist studies demonstrated a similar increase in peak LV twist and untwisting rate in response to tachycardia (combined data: baseline -259±22; at 260bpm -498±59 deg/s, p=0.003); however, overall twist patterns differed between groups: NP tended to increase apical positive rotation (p=0.1) while YPs increased basal negative rotation (p=0.009) to augment LV twist. Finally, as it permitted testing of the effects of tachycardia on different noninvasive LV function markers, it was shown that echo-measured strain rate is not independent of heart rate in the immature heart. This is in contrast to what has been demonstrated for the more mature heart. Conclusion: The neonatal piglet LV appears more tolerant of atrial tachycardia than that of the young piglet heart which could relate to better diastolic performance and differences in twist mechanics. Use of strain rate in the immature heart should take into consideration changes in heart rate.
Download or read book Impact of Right Ventricular Pacing Site on Left Ventricular Function written by Anna-Marie Marsh and published by . This book was released on 2008 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abridged Index Medicus written by and published by . This book was released on 1997 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Pericardium written by Ralph Shabetai and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many noteworthy advances in our knowledge of the pericardium, its functions and diseases and their relation to heart failure have been made since the first edition of this book appeared in 1981; and no other book that covers in detail the physiology and pathophysiology has since been published. The first edition was favourably received, and I have frequently been asked to write a new edition. My own knowledge in the years that have passed since then, and my clinical and research experience in the field of the subject have both increased. For all these reasons, I decided that the second edition was overdue. The long time that has elapsed between editions necessitated rewriting, rather than simply revising, most of the text. For the same reason, many of the figures are new. Most of the references I have cited appeared in the literature after 1981, but I have retained a number of earlier ones, either because they are classics or, in my opinion, have not yet been bettered. It is my hope that the new edition will be a useful resource for clinicians called upon to manage patients with pericardial disease and for physiologists when the pericardium is relevant to their investigations. I make no apology for the in-depth treatment of the pericardial physiology and pathophysiology throughout the book, for they are the foundation on which diagnosis, hemodynamic and imaging studies, and management must rest.
Download or read book Oxford Textbook of Advanced Heart Failure and Cardiac Transplantation written by Michael J. Domanski and published by Oxford University Press. This book was released on 2016 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Oxford Textbook of Advanced Heart Failure and Cardiac Transplantation is the authoritative text on advanced heart failure and a key resource for clinicians caring for heart failure patients. It comes with an online version which allows you to find content quickly and easily, with intuitive search options and cross-linking, and access to downloadable content.
Download or read book The Right Ventricle written by Marvin A. Konstam and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is quite natural that literature related to car heart disease, cardiomyopathy, pulmonary and diac structure, function, pathology, and patho pulmonary vascular disease, trauma, acquired valvular disease, congenital disease, and surgi physiology has emphasized the left heart and systemic circulation. The relative lack of im cal considerations. The pathologic and clinical relevance of myocardial infarction of the right portance of the right ventricle was supported by studies performed in the 1940s and 1950s ventricle has only been documented over the which suggested that the right ventricular free last 15 years. The chapter on right ventricular wall could be effectively destroyed in an animal infarction integrates clinical, functional, patho model without detectable untoward hemody physiologic, and pathologic observations to pro namic consequences. The relative inadequacy vide the reader with a thorough review, equally of noninvasive tools to study right ventricular relevant to the clinician and investigator. The contribution on dilated cardiomyopathy pro structure and function obviated detailed and systematic investigation. However, over the vides novel insight into the impact of right ventricular performance on the functional in past 15 years there has been a resurgence of interest in the right ventricle by a variety of capacity accompanying left heart failure. A book dealing with the right ventricle would investigators. The skeptic would argue that this renewed interest resulted from an exhaustion be incomplete without at least cursory reference we have of clinically-related observations that could be to the pulmonary circulation.
Download or read book IOC Manual of Sports Cardiology written by Mathew G. Wilson and published by John Wiley & Sons. This book was released on 2016-12-19 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chapter 8 Cardiovascular Screening for the Prevention of Sudden Cardiac Death in AthletesIntroduction; The Risk of Sudden Death in Athletes; Rationale for Screening Competitive Athletes; The Screening Programmes Implemented in Italy; Rationale for Including a 12-Lead ECG in the PPE ; Efficacy of Screening to Identify Cardiac Disease Risk; Impact of the Screening Programme on Cardiac Mortality; Costs of Systematic Screening across Italy; Limitations of Screening Programmes; Conclusion; References
Download or read book Handbook of Cardiac Anatomy Physiology and Devices written by Paul A. Iaizzo and published by Springer. This book was released on 2015-11-13 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the latest information on the anatomic features, underlying physiologic mechanisms, and treatments for diseases of the heart. Key chapters address animal models for cardiac research, cardiac mapping systems, heart-valve disease and genomics-based tools and technology. Once again, a companion of supplementary videos offer unique insights into the working heart that enhance the understanding of key points within the text. Comprehensive and state-of-the art, the Handbook of Cardiac Anatomy, Physiology and Devices, Third Edition provides clinicians and biomedical engineers alike with the authoritative information and background they need to work on and implement tomorrow’s generation of life-saving cardiac devices.
Download or read book The Right Heart written by Sean P. Gaine and published by Springer. This book was released on 2014-05-12 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The heart and lung are intricately linked. When the heart is affected by disease, the lungs will often show some related pathological or clinical conditions and vice versa. Pulmonary heart disease is by definition a condition when the lungs cause the heart to fail. The left ventricle in combination with the other structures in the “left heart” pumps blood throughout the body. The right ventricle (and structures of the “right heart”) pumps blood to the lungs where it is oxygenated and returned to the left heart for distribution. In normal circumstances, the right heart pumps blood into the lungs without any resistance. The lungs usually have minimal pressure and the right heart easily pumps blood through. However when there is lung disease present, like emphysema, chronic obstructive lung disease (COPD) or pulmonary hypertension- the small blood vessels become very stiff and rigid. The right ventricle is no longer able to push blood into the lungs and eventually fails. This is known as pulmonary heart disease. Pulmonary heart disease is also known as right heart failure or cor pulmonale. The chief cause of right heart failure is the increase in blood pressure in the lungs (pulmonary artery).
Download or read book Textbook of Echocardiography written by V Amuthan and published by Jaypee Brothers Medical Publishers. This book was released on 2022-02-27 with total page 935 pages. Available in PDF, EPUB and Kindle. Book excerpt: An echocardiogram uses sound waves to produce images of the heart. This common test allows a doctor to see the heart beating and pumping blood, and subsequently identify heart disease. This book is a complete guide to performing and interpreting an echocardiogram. 56 chapters describe both basic and advanced techniques for diagnosing different heart disorders. The second edition has been fully revised to provide clinicians with the latest developments and techniques in the field. Seven new chapters have been added to this edition covering echocardiography and artificial intelligence, hypertension, arrhythmogenic right ventricular dysplasia, Kawasaki disease, cardio-oncology, diabetes mellitus, and foetal echo. Dedicated chapters emphasise the role of echo in surgical procedures, and explore its use with electrophysiology – in patients with pacemakers and those undergoing cardiac resynchronisation therapy. The book is highly illustrated with many 2D and 3D echo images helping explain the descriptive text for each topic. The previous edition (9789352700929) published in 2017.
Download or read book Essentials of Anesthesia for Infants and Neonates written by Mary Ellen McCann and published by Cambridge University Press. This book was released on 2018-02-22 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical, comprehensive guide to the special needs of infants and neonates undergoing anesthesia.
