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The basic mechanism underlying directional differences in excitability, con duction velocity, andsafetyfactor thatleadtocircusmovementreentry incardiac muscle is generally attributed to a spatial difference in the refractory period as originally described by Mines [1] or to a depressed segment as described by Schmitt and Erlanger [2]. A departure from this depolarization in cardiac muscle involve quantities, such as Vmax' that are not directly descriptive of the underlying mechanisms of propagation.
Book Synopsis Activation, Metabolism and Perfusion of the Heart by : S. Sideman
Download or read book Activation, Metabolism and Perfusion of the Heart written by S. Sideman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: The basic mechanism underlying directional differences in excitability, con duction velocity, andsafetyfactor thatleadtocircusmovementreentry incardiac muscle is generally attributed to a spatial difference in the refractory period as originally described by Mines [1] or to a depressed segment as described by Schmitt and Erlanger [2]. A departure from this depolarization in cardiac muscle involve quantities, such as Vmax' that are not directly descriptive of the underlying mechanisms of propagation.
Assessment of cardiac energetics at the level of ATP-synthesis, chemomechanical energy transformation and whole organ dynamics as a function of haemodynamic load, ventricular configuration and oxygen- and substrates supply is basic to understanding cardiac function under physiological and pathophysiological (hypertrophy, hypoxia, ischaemia and heart failure) conditions. Moreover, cardiac energetics should be an important consideration in the choice and application of drugs especially in the case of vasodilators, inotropic agents and in cardioprotective measures. Only by considering energetics at the subcellular, cellular, and whole-heart level we can arrive at a better understanding of cardiac performance and ultimately better clinical judgement and drug therapy. Quantification of myocardial energetics will also help to determine the optimal time for surgical interventions such as valvular replacement or aneurysm resection. The present volume is the outcome of an international symposium on cardiac energetics held in Gargellen/Montafon (Austria), June 1986. The contributions will certainly help bridge the existing gap between basic research involving isolated structures and that involving the whole organ, on the one hand, and render the results derived from basic research applicable to clinical problems, on the other hand.
Book Synopsis Cardiac Energetics by : R. Jacob
Download or read book Cardiac Energetics written by R. Jacob and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assessment of cardiac energetics at the level of ATP-synthesis, chemomechanical energy transformation and whole organ dynamics as a function of haemodynamic load, ventricular configuration and oxygen- and substrates supply is basic to understanding cardiac function under physiological and pathophysiological (hypertrophy, hypoxia, ischaemia and heart failure) conditions. Moreover, cardiac energetics should be an important consideration in the choice and application of drugs especially in the case of vasodilators, inotropic agents and in cardioprotective measures. Only by considering energetics at the subcellular, cellular, and whole-heart level we can arrive at a better understanding of cardiac performance and ultimately better clinical judgement and drug therapy. Quantification of myocardial energetics will also help to determine the optimal time for surgical interventions such as valvular replacement or aneurysm resection. The present volume is the outcome of an international symposium on cardiac energetics held in Gargellen/Montafon (Austria), June 1986. The contributions will certainly help bridge the existing gap between basic research involving isolated structures and that involving the whole organ, on the one hand, and render the results derived from basic research applicable to clinical problems, on the other hand.
Research centering on blood flow in the heart continues to hold an important position, especially since a better understanding of the subject may help reduce the incidence of coronary arterial disease and heart attacks. This book summarizes recent advances in the field; it is the product of fruitful cooperation among international scientists who met in Japan in May, 1990 to discuss the regulation of coronary blood flow.
Book Synopsis Regulation of Coronary Blood Flow by : Michitoshi Inoue
Download or read book Regulation of Coronary Blood Flow written by Michitoshi Inoue and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research centering on blood flow in the heart continues to hold an important position, especially since a better understanding of the subject may help reduce the incidence of coronary arterial disease and heart attacks. This book summarizes recent advances in the field; it is the product of fruitful cooperation among international scientists who met in Japan in May, 1990 to discuss the regulation of coronary blood flow.
One of the most time-consuming tasks in clinical medicine is seeking the opinions of specialist colleagues. There is a pressure not only to make referrals appropriate but also to summarize the case in the language of the specialist. This book explains basic physiologic and pathophysiologic mechanisms of cardiovascular disease in a straightforward manner, gives guidelines as to when referral is appropriate, and, uniquely, explains what the specialist is likely to do. It is ideal for any hospital doctor, generalist, or even senior medical student who may need a cardiology opinion, or for that ma.
Book Synopsis Cardiology Explained by : Euan A. Ashley
Download or read book Cardiology Explained written by Euan A. Ashley and published by Remedica. This book was released on 2004 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most time-consuming tasks in clinical medicine is seeking the opinions of specialist colleagues. There is a pressure not only to make referrals appropriate but also to summarize the case in the language of the specialist. This book explains basic physiologic and pathophysiologic mechanisms of cardiovascular disease in a straightforward manner, gives guidelines as to when referral is appropriate, and, uniquely, explains what the specialist is likely to do. It is ideal for any hospital doctor, generalist, or even senior medical student who may need a cardiology opinion, or for that ma.
The microcirculation is highly responsive to, and a vital participant in, the inflammatory response. All segments of the microvasculature (arterioles, capillaries, and venules) exhibit characteristic phenotypic changes during inflammation that appear to be directed toward enhancing the delivery of inflammatory cells to the injured/infected tissue, isolating the region from healthy tissue and the systemic circulation, and setting the stage for tissue repair and regeneration. The best characterized responses of the microcirculation to inflammation include impaired vasomotor function, reduced capillary perfusion, adhesion of leukocytes and platelets, activation of the coagulation cascade, and enhanced thrombosis, increased vascular permeability, and an increase in the rate of proliferation of blood and lymphatic vessels. A variety of cells that normally circulate in blood (leukocytes, platelets) or reside within the vessel wall (endothelial cells, pericytes) or in the perivascular space (mast cells, macrophages) are activated in response to inflammation. The activation products and chemical mediators released from these cells act through different well-characterized signaling pathways to induce the phenotypic changes in microvessel function that accompany inflammation. Drugs that target a specific microvascular response to inflammation, such as leukocyte-endothelial cell adhesion or angiogenesis, have shown promise in both the preclinical and clinical studies of inflammatory disease. Future research efforts in this area will likely identify new avenues for therapeutic intervention in inflammation. Table of Contents: Introduction / Historical Perspectives / Anatomical Considerations / Impaired Vasomotor Responses / Capillary Perfusion / Angiogenesis / Leukocyte-Endothelial Cell Adhesion / Platelet-Vessel Wall Interactions / Coagulation and Thrombosis / Endothelial Barrier Dysfunction / Epilogue / References
Book Synopsis Inflammation and the Microcirculation by : D. Neil Granger
Download or read book Inflammation and the Microcirculation written by D. Neil Granger and published by Morgan & Claypool Publishers. This book was released on 2010 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microcirculation is highly responsive to, and a vital participant in, the inflammatory response. All segments of the microvasculature (arterioles, capillaries, and venules) exhibit characteristic phenotypic changes during inflammation that appear to be directed toward enhancing the delivery of inflammatory cells to the injured/infected tissue, isolating the region from healthy tissue and the systemic circulation, and setting the stage for tissue repair and regeneration. The best characterized responses of the microcirculation to inflammation include impaired vasomotor function, reduced capillary perfusion, adhesion of leukocytes and platelets, activation of the coagulation cascade, and enhanced thrombosis, increased vascular permeability, and an increase in the rate of proliferation of blood and lymphatic vessels. A variety of cells that normally circulate in blood (leukocytes, platelets) or reside within the vessel wall (endothelial cells, pericytes) or in the perivascular space (mast cells, macrophages) are activated in response to inflammation. The activation products and chemical mediators released from these cells act through different well-characterized signaling pathways to induce the phenotypic changes in microvessel function that accompany inflammation. Drugs that target a specific microvascular response to inflammation, such as leukocyte-endothelial cell adhesion or angiogenesis, have shown promise in both the preclinical and clinical studies of inflammatory disease. Future research efforts in this area will likely identify new avenues for therapeutic intervention in inflammation. Table of Contents: Introduction / Historical Perspectives / Anatomical Considerations / Impaired Vasomotor Responses / Capillary Perfusion / Angiogenesis / Leukocyte-Endothelial Cell Adhesion / Platelet-Vessel Wall Interactions / Coagulation and Thrombosis / Endothelial Barrier Dysfunction / Epilogue / References
The aim of this treatise is to summarize the current understanding of the mechanisms for blood flow control to skeletal muscle under resting conditions, how perfusion is elevated (exercise hyperemia) to meet the increased demand for oxygen and other substrates during exercise, mechanisms underlying the beneficial effects of regular physical activity on cardiovascular health, the regulation of transcapillary fluid filtration and protein flux across the microvascular exchange vessels, and the role of changes in the skeletal muscle circulation in pathologic states. Skeletal muscle is unique among organs in that its blood flow can change over a remarkably large range. Compared to blood flow at rest, muscle blood flow can increase by more than 20-fold on average during intense exercise, while perfusion of certain individual white muscles or portions of those muscles can increase by as much as 80-fold. This is compared to maximal increases of 4- to 6-fold in the coronary circulation during exercise. These increases in muscle perfusion are required to meet the enormous demands for oxygen and nutrients by the active muscles. Because of its large mass and the fact that skeletal muscles receive 25% of the cardiac output at rest, sympathetically mediated vasoconstriction in vessels supplying this tissue allows central hemodynamic variables (e.g., blood pressure) to be spared during stresses such as hypovolemic shock. Sympathetic vasoconstriction in skeletal muscle in such pathologic conditions also effectively shunts blood flow away from muscles to tissues that are more sensitive to reductions in their blood supply that might otherwise occur. Again, because of its large mass and percentage of cardiac output directed to skeletal muscle, alterations in blood vessel structure and function with chronic disease (e.g., hypertension) contribute significantly to the pathology of such disorders. Alterations in skeletal muscle vascular resistance and/or in the exchange properties of this vascular bed also modify transcapillary fluid filtration and solute movement across the microvascular barrier to influence muscle function and contribute to disease pathology. Finally, it is clear that exercise training induces an adaptive transformation to a protected phenotype in the vasculature supplying skeletal muscle and other tissues to promote overall cardiovascular health. Table of Contents: Introduction / Anatomy of Skeletal Muscle and Its Vascular Supply / Regulation of Vascular Tone in Skeletal Muscle / Exercise Hyperemia and Regulation of Tissue Oxygenation During Muscular Activity / Microvascular Fluid and Solute Exchange in Skeletal Muscle / Skeletal Muscle Circulation in Aging and Disease States: Protective Effects of Exercise / References
Book Synopsis Skeletal Muscle Circulation by : Ronald J. Korthuis
Download or read book Skeletal Muscle Circulation written by Ronald J. Korthuis and published by Morgan & Claypool Publishers. This book was released on 2011 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this treatise is to summarize the current understanding of the mechanisms for blood flow control to skeletal muscle under resting conditions, how perfusion is elevated (exercise hyperemia) to meet the increased demand for oxygen and other substrates during exercise, mechanisms underlying the beneficial effects of regular physical activity on cardiovascular health, the regulation of transcapillary fluid filtration and protein flux across the microvascular exchange vessels, and the role of changes in the skeletal muscle circulation in pathologic states. Skeletal muscle is unique among organs in that its blood flow can change over a remarkably large range. Compared to blood flow at rest, muscle blood flow can increase by more than 20-fold on average during intense exercise, while perfusion of certain individual white muscles or portions of those muscles can increase by as much as 80-fold. This is compared to maximal increases of 4- to 6-fold in the coronary circulation during exercise. These increases in muscle perfusion are required to meet the enormous demands for oxygen and nutrients by the active muscles. Because of its large mass and the fact that skeletal muscles receive 25% of the cardiac output at rest, sympathetically mediated vasoconstriction in vessels supplying this tissue allows central hemodynamic variables (e.g., blood pressure) to be spared during stresses such as hypovolemic shock. Sympathetic vasoconstriction in skeletal muscle in such pathologic conditions also effectively shunts blood flow away from muscles to tissues that are more sensitive to reductions in their blood supply that might otherwise occur. Again, because of its large mass and percentage of cardiac output directed to skeletal muscle, alterations in blood vessel structure and function with chronic disease (e.g., hypertension) contribute significantly to the pathology of such disorders. Alterations in skeletal muscle vascular resistance and/or in the exchange properties of this vascular bed also modify transcapillary fluid filtration and solute movement across the microvascular barrier to influence muscle function and contribute to disease pathology. Finally, it is clear that exercise training induces an adaptive transformation to a protected phenotype in the vasculature supplying skeletal muscle and other tissues to promote overall cardiovascular health. Table of Contents: Introduction / Anatomy of Skeletal Muscle and Its Vascular Supply / Regulation of Vascular Tone in Skeletal Muscle / Exercise Hyperemia and Regulation of Tissue Oxygenation During Muscular Activity / Microvascular Fluid and Solute Exchange in Skeletal Muscle / Skeletal Muscle Circulation in Aging and Disease States: Protective Effects of Exercise / References
This e-book will review special features of the cerebral circulation and how they contribute to the physiology of the brain. It describes structural and functional properties of the cerebral circulation that are unique to the brain, an organ with high metabolic demands and the need for tight water and ion homeostasis. Autoregulation is pronounced in the brain, with myogenic, metabolic and neurogenic mechanisms contributing to maintain relatively constant blood flow during both increases and decreases in pressure. In addition, unlike peripheral organs where the majority of vascular resistance resides in small arteries and arterioles, large extracranial and intracranial arteries contribute significantly to vascular resistance in the brain. The prominent role of large arteries in cerebrovascular resistance helps maintain blood flow and protect downstream vessels during changes in perfusion pressure. The cerebral endothelium is also unique in that its barrier properties are in some way more like epithelium than endothelium in the periphery. The cerebral endothelium, known as the blood-brain barrier, has specialized tight junctions that do not allow ions to pass freely and has very low hydraulic conductivity and transcellular transport. This special configuration modifies Starling's forces in the brain microcirculation such that ions retained in the vascular lumen oppose water movement due to hydrostatic pressure. Tight water regulation is necessary in the brain because it has limited capacity for expansion within the skull. Increased intracranial pressure due to vasogenic edema can cause severe neurologic complications and death.
Book Synopsis The Cerebral Circulation by : Marilyn J. Cipolla
Download or read book The Cerebral Circulation written by Marilyn J. Cipolla and published by Biota Publishing. This book was released on 2016-07-28 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This e-book will review special features of the cerebral circulation and how they contribute to the physiology of the brain. It describes structural and functional properties of the cerebral circulation that are unique to the brain, an organ with high metabolic demands and the need for tight water and ion homeostasis. Autoregulation is pronounced in the brain, with myogenic, metabolic and neurogenic mechanisms contributing to maintain relatively constant blood flow during both increases and decreases in pressure. In addition, unlike peripheral organs where the majority of vascular resistance resides in small arteries and arterioles, large extracranial and intracranial arteries contribute significantly to vascular resistance in the brain. The prominent role of large arteries in cerebrovascular resistance helps maintain blood flow and protect downstream vessels during changes in perfusion pressure. The cerebral endothelium is also unique in that its barrier properties are in some way more like epithelium than endothelium in the periphery. The cerebral endothelium, known as the blood-brain barrier, has specialized tight junctions that do not allow ions to pass freely and has very low hydraulic conductivity and transcellular transport. This special configuration modifies Starling's forces in the brain microcirculation such that ions retained in the vascular lumen oppose water movement due to hydrostatic pressure. Tight water regulation is necessary in the brain because it has limited capacity for expansion within the skull. Increased intracranial pressure due to vasogenic edema can cause severe neurologic complications and death.
The study of cardiovascular function is vital to contemporary biomedical research. However, integration between cellular and subcellular research and organ-level studies is often lacking, as is integration of clinical and basic investigation. This book examines cardiovascular system function from the perspectives of assessment and analysis, with a focus on evaluating function at different anatomical levels using a combination of analytical, experimental, and clinical measurements.
Book Synopsis Analysis and Assessment of Cardiovascular Function by : Gary M. Drzewiecki
Download or read book Analysis and Assessment of Cardiovascular Function written by Gary M. Drzewiecki and published by Springer Science & Business Media. This book was released on 1998 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of cardiovascular function is vital to contemporary biomedical research. However, integration between cellular and subcellular research and organ-level studies is often lacking, as is integration of clinical and basic investigation. This book examines cardiovascular system function from the perspectives of assessment and analysis, with a focus on evaluating function at different anatomical levels using a combination of analytical, experimental, and clinical measurements.
Our understanding of the pathophysiology of acute myocardial infarction has grown enormously in recent years. This has led to an increasingly aggressive approach to management, designed to blunt the extent of infarction by salvaging acutely ischemic myocardium. Alternatives now include throm bolysis, PTCA with and without prior thrombolysis, and emergency bypass surgery, as well as the more aggressive use of a variety of drugs. This book consists of a series of chapters by experienced cardiologists and cardiovascular surgeons that present today's state of the art in managing acute myocardial infarction. It is written with the purpose of presenting practical approaches of value to the clinician related to the more complex problems faced in dealing with patients undergoing myocardial infarction. xi EARLY INTERVENTIONS IN ACUTE MYOCARDIAL INFARCTION 1. MANAGEMENT OF ARRHYTHMIAS IN THE CORONARY CARE UNIT NORA GOLDSCHLAGER, RODERICK WOODS, AND NEAL BENOWITZ With the advent of coronary care units, mortality from cardiac arrhythmias occurring during acute myocardial infarction has been unquestionably and dramatically reduced. In addition, continuous electrocardiographic monitoring has resulted in the recognition of specific arrhythmias related to acute ischemic heart disease and thus to the development of appropriate strategies for their management. This chapter will review certain specific aspects of those bradyarrhythmias and atrial and ventricular tachyarrhythmias that are seen most commonly in acute myocardial infarction. Pharmacologic therapy, including the use of some of the newer antiarrhythmic agents, will be discussed, as will pacemaker ther apy of both bradyarrhythmias and tachyarrhythmias.
Book Synopsis Early Interventions in Acute Myocardial Infarction by : Elliot Rapaport
Download or read book Early Interventions in Acute Myocardial Infarction written by Elliot Rapaport and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our understanding of the pathophysiology of acute myocardial infarction has grown enormously in recent years. This has led to an increasingly aggressive approach to management, designed to blunt the extent of infarction by salvaging acutely ischemic myocardium. Alternatives now include throm bolysis, PTCA with and without prior thrombolysis, and emergency bypass surgery, as well as the more aggressive use of a variety of drugs. This book consists of a series of chapters by experienced cardiologists and cardiovascular surgeons that present today's state of the art in managing acute myocardial infarction. It is written with the purpose of presenting practical approaches of value to the clinician related to the more complex problems faced in dealing with patients undergoing myocardial infarction. xi EARLY INTERVENTIONS IN ACUTE MYOCARDIAL INFARCTION 1. MANAGEMENT OF ARRHYTHMIAS IN THE CORONARY CARE UNIT NORA GOLDSCHLAGER, RODERICK WOODS, AND NEAL BENOWITZ With the advent of coronary care units, mortality from cardiac arrhythmias occurring during acute myocardial infarction has been unquestionably and dramatically reduced. In addition, continuous electrocardiographic monitoring has resulted in the recognition of specific arrhythmias related to acute ischemic heart disease and thus to the development of appropriate strategies for their management. This chapter will review certain specific aspects of those bradyarrhythmias and atrial and ventricular tachyarrhythmias that are seen most commonly in acute myocardial infarction. Pharmacologic therapy, including the use of some of the newer antiarrhythmic agents, will be discussed, as will pacemaker ther apy of both bradyarrhythmias and tachyarrhythmias.
That geriatric cardiology has become a science and clinical discipline in its own rights is beyond dispute. Most cardiac disorders present with different symptoms and signs, require a different diagnostic and therapeutic approach, and also have a different prognosis in the elderly as compared to younger patients. Cardiovascular Disease in the Elderly provides a comprehensive, up-to-date guide to the physician, representing a pioneering work in this increasingly complex area. For this third edition most of the chapters have been completely rewritten, some by different authors. Four new chapters have been added, dealing with cardiac transplantation, invasive cardiovascular procedures, dietary considerations and ethical considerations. It cannot be denied that invasive procedures and transplantation are highly controversial in this area, and the ethical dilemmas involved are ably discussed by Dr Davis and associates. All chapters are supplied with a thorough list of references, making this third edition of Cardiovascular Disease in the Elderly the most thorough, concise guide for the practicing physician.
Book Synopsis Cardiovascular Disease in the Elderly by : Franz H. Messerli
Download or read book Cardiovascular Disease in the Elderly written by Franz H. Messerli and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: That geriatric cardiology has become a science and clinical discipline in its own rights is beyond dispute. Most cardiac disorders present with different symptoms and signs, require a different diagnostic and therapeutic approach, and also have a different prognosis in the elderly as compared to younger patients. Cardiovascular Disease in the Elderly provides a comprehensive, up-to-date guide to the physician, representing a pioneering work in this increasingly complex area. For this third edition most of the chapters have been completely rewritten, some by different authors. Four new chapters have been added, dealing with cardiac transplantation, invasive cardiovascular procedures, dietary considerations and ethical considerations. It cannot be denied that invasive procedures and transplantation are highly controversial in this area, and the ethical dilemmas involved are ably discussed by Dr Davis and associates. All chapters are supplied with a thorough list of references, making this third edition of Cardiovascular Disease in the Elderly the most thorough, concise guide for the practicing physician.
