Download or read book Photoplethysmography for Non invasive Measurement of Bone Hemodynamic Responses to Changes in External Pressure written by Pereira de Mateus Silva Mateus and published by . This book was released on 2011 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adequate blood supply and circulation in bones is required to maintain a healthy skeleton, and inadequate blood perfusion is associated with numerous bone pathologies and a decrease in bone mineral density (BMD). Bone hemodynamics remains poorly understood and loss of BMD is still one of the limiting factors to long duration human spaceflight. Developments in photoplethysmography (PPG) hardware have made it a promising tool for non-invasive bone hemodynamic measurements. The aims of this thesis are to: 1) validate the use of PPG as a tool for non-invasive bone hemodynamic measurements, 2) characterize bone hemodynamic responses to changes in external pressure, and 3) identify the predominant mechanisms regulating bone hemodynamic responses to pressure changes. A new PPG device capable of measuring bone hemodynamic responses was designed and tested. It represents the state-of-the-art in deep-tissue PPG instrumentation. Validation experiments including arterial occlusion, cold exposure, skin occlusion and nitroglycerin exposure were performed. Single-limb pressure chamber experiments were performed over a range of pressures from -50 to +50 mmHg to characterize the responses to changes in external pressure and to identify the predominant control mechanisms. Our results support the use of PPG as a valid tool for measuring bone hemodynamic responses. Bone hemodynamic responses to changes in external pressure have been characterized for the first time. We also present the first report of a myogenic response in bone and show that the myogenic effect is the predominant control mechanism in bone over a wide range of pressure levels. Myogenic-induced vasoconstriction is observed at all negative pressure levels, with increasing vasoconstriction at the more extreme pressure differences. At positive pressures we observed an initial myogenic-induced vasodilation followed by activation of the intramuscular pressure receptors at +30 mmHg which overrides the initial response and causes vasoconstriction at the highest positive pressure. The availability of a new tool for non-invasive bone hemodynamic measurements opens the door to several new research opportunities with clinical, Earth-based as well as human spaceflight applications.
Download or read book Skeletal Circulation In Clinical Practice written by Roy Kenneth Aaron and published by World Scientific. This book was released on 2016-01-21 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bone circulation is important to our understanding of many major orthopedic conditions such as osteoarthritis, osteoporosis, repair, and tumors. Yet, circulatory physiology, basic to all healthy organs and most diseases, has been difficult to study in the skeleton. The biological regulation of blood flow is complex and the tissues have been relatively inaccessible to measurement. In recent years, however, advances have been made in understanding circulatory physiology and fluid flow in bone, functional measurement of blood flow, and the roles of circulation in bone turnover and repair. These advances have enhanced our insights into bone homeostasis and the interrelationships of circulation and skeletal biology, including repair and disease.This seminal volume presents updated information on circulatory physiology of bone and fluid flow through the bone matrix. It then describes new techniques in quantifying and imaging bone circulation. A clinical section covering circulatory elements of skeletal diseases provides valuable insight into pathophysiology that may serve as diagnostic biomarkers or therapeutic targets.
Download or read book Photoplethysmography written by Panicos A. Kyriacou and published by Academic Press. This book was released on 2021-11-03 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoplethysmography: Technology, Signal Analysis, and Applications is the first comprehensive volume on the theory, principles, and technology (sensors and electronics) of photoplethysmography (PPG). It provides a detailed description of the current state-of-the-art technologies/optical components enabling the extreme miniaturization of such sensors, as well as comprehensive coverage of PPG signal analysis techniques including machine learning and artificial intelligence. The book also outlines the huge range of PPG applications in healthcare, with a strong focus on the contribution of PPG in wearable sensors and PPG for cardiovascular assessment. Presents the underlying principles and technology surrounding PPG Includes applications for healthcare and wellbeing Focuses on PPG in wearable sensors and devices Presents advanced signal analysis techniques Includes cutting-edge research, applications and future directions
Download or read book Seamless Healthcare Monitoring written by Toshiyo Tamura and published by Springer. This book was released on 2017-11-24 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shares the knowledge of active and prestigious worldwide researchers and scholars in the field of healthcare monitoring as authors investigate historical developments, summarize latest advancements, and envision future prospects on wearable, attachable, and invisible devices that monitor diverse physiological information. The coverage of the book spans multiple disciplines, from biomechanics, to bioelectricity, biochemistry, biophysics and biomaterials. There is also wide coverage of various physical and chemical quantities such as electricity, pressure, flow, motion, force, temperature, gases, and biomarkers. Each chapter explores the background of a specific monitoring device, as well as its physical and chemical principles and instrumentation, signal processing and data analysis, achieved outcomes and application scenarios, and future research topics. There are chapters on: Electrocardiograms, electroencephalograms, and electromyograms Measurement of flow phenomenon Latest wearable technologies for the quantification of human motion Various forms of wearable thermometers Monitoring of gases and chemical substances produced during metabolism...and more! This book is appropriate and accessible for students and scientists, as well as researchers in biomedical engineering, computer engineers, healthcare entrepreneurs, administrative officers, policy makers, market vendors, and healthcare personnel. It helps to provide us with insights into future endeavors, formulate innovative businesses and services, and will help improve people’s health and quality of life.
Download or read book Essential Clinical Anesthesia written by Charles Vacanti and published by Cambridge University Press. This book was released on 2011-07-11 with total page 1191 pages. Available in PDF, EPUB and Kindle. Book excerpt: The clinical practice of anesthesia has undergone many advances in the past few years, making this the perfect time for a new state-of-the-art anesthesia textbook for practitioners and trainees. The goal of this book is to provide a modern, clinically focused textbook giving rapid access to comprehensive, succinct knowledge from experts in the field. All clinical topics of relevance to anesthesiology are organized into 29 sections consisting of more than 180 chapters. The print version contains 166 chapters that cover all of the essential clinical topics, while an additional 17 chapters on subjects of interest to the more advanced practitioner can be freely accessed at www.cambridge.org/vacanti. Newer techniques such as ultrasound nerve blocks, robotic surgery and transesophageal echocardiography are included, and numerous illustrations and tables assist the reader in rapidly assimilating key information. This authoritative text is edited by distinguished Harvard Medical School faculty, with contributors from many of the leading academic anesthesiology departments in the United States and an introduction from Dr S. R. Mallampati. This book is your essential companion when preparing for board review and recertification exams and in your daily clinical practice.
Download or read book Cardiovascular Physiology written by Robert M. Berne and published by . This book was released on 1986 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of Mosby's successful monograph series, CARDIOVASCULAR PHYSIOLOGY presents fundamental concepts clearly and concisely. Students gain a solid understanding on how the cardiovascular system functions in both health and disease. Throughout, excellent illustrations and consistent pedagogical features focus student learning. In addition, the clinical commentaries help students apply what they've learned to real-life clinical situations.
Download or read book Advanced Hemodynamic Monitoring Basics and New Horizons written by Mikhail Y. Kirov and published by Springer Nature. This book was released on 2021-08-31 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes how to monitor and optimize cardiovascular dynamics using advanced hemodynamic monitoring in perioperative and intensive care medicine. The book outlines basic skills of hemodynamic monitoring, different techniques including invasive, minimally invasive, and non-invasive methods, and algorithms and treatment strategies for perioperative goal-directed hemodynamic therapy in different groups of surgical patients. Thus, the book reflects current diagnostic and therapeutic approaches in perioperative and intensive care medicine. All sections of this book have a learning-oriented style and are illustrated with tables and figures summarizing the main content. The volume is addressed both to specialists and residents using advanced hemodynamic monitoring; it reflects indications and limitations of current monitoring tools and discuss therapeutic strategies. It also helps readers to integrate new knowledge on monitoring of cardiovascular dynamics into clinical practice.
Download or read book The Arterial System in Hypertension written by Michel Emile Safar and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: MICHEL E. SAFAR and MICHAEL F. O'ROURKE One of the principal problems of hypertension is the precise definition of blood pressure as a cardiovascular risk factor. Clinicians indicate peak systolic pressure and end diastolic pressure in the brachial artery as the principal criteria for blood pressure measurement. Consequently, these values are as indicators for clinical management and therapeutic adjustment. This used methodology, based on indirect blood pressure measurements at the site of the brachial artery relates only to the highest and lowest pressure in that vessel, and does not give any information of the blood pressure curve itself; this carries more information than peak systolic pressure and end diastolic pressure. As a first step in better analysis of the blood pressure curve, research workers in experimental hypertension defined in addition to peak systolic pressure and end diastolic, another blood pressure value, mean arterial pressure, i. e. the average pressure throughout the cardiac cycle, and about which pressure fluctuates. This is the pressure recorded by Hales [1] and by Poiseuille [2] in their pioneering studies. By application of Poiseuille's Law, this definition of mean arterial pressure led to the concept that increased mean arterial pressure (and therefore hypertension) was related, at any given value of cardiac output, to an increase in vascular resistance, i. e. to a reduc tion in the caliber of the small arteries.
Download or read book Effects of Exercise on Hypertension written by Linda S. Pescatello and published by Springer. This book was released on 2015-07-08 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the first primer on the effects of exercise on human hypertension, Effects of Exercise on Hypertension: From Cells to Physiological Systems provides the state-of-the-art effects of exercise on the many possible mechanisms underlying essential hypertension in humans. The book contains chapters by distinguished experts on the effects of exercise on physiological systems known to be involved in hypertension development and maintenance as well as less well known aspects of hypertension such as 24-hour ambulatory blood pressure profile and oxidative stress. An emerging area, the effects of resistance exercise training on blood pressure is also covered. A unique aspect of the book is that it covers the effects of exercise mimetics on vascular cell adaptations in order to begin to elucidate some of the cellular mechanisms that may underlie blood pressure reductions with exercise training. Lastly, the book will end with a chapter on the interactive effects of genes and exercise on blood pressure. Chapters are grouped by physiological system or mechanism. The text begins with two overview chapters; one on the general effects of aerobic exercise training and the second on the general effects of resistance exercise training on blood pressure. Each chapter begins with a bulleted list of key points. Effects of Exercise on Hypertension: From Cells to Physiological Systems will be of great value to professional individuals in cardiovascular medicine, the cardiovascular sciences, allied health care professionals, and medical and graduate students in the cardiovascular sciences and medicine.
Download or read book Clinical Gynecology written by Eric J. Bieber and published by Cambridge University Press. This book was released on 2015-04-23 with total page 1127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written with the busy practice in mind, this book delivers clinically focused, evidence-based gynecology guidance in a quick-reference format. It explores etiology, screening, tests, diagnosis, and treatment for a full range of gynecologic health issues. The coverage includes the full range of gynecologic malignancies, reproductive endocrinology and infertility, infectious diseases, urogynecologic problems, gynecologic concerns in children and adolescents, and surgical interventions including minimally invasive surgical procedures. Information is easy to find and absorb owing to the extensive use of full-color diagrams, algorithms, and illustrations. The new edition has been expanded to include aspects of gynecology important in international and resource-poor settings.
Download or read book Principles of Venous Hemodynamics written by Paolo Zamboni and published by Nova Science Publishers. This book was released on 2009-01-01 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatment of varicose veins based on hemodynamic considerations and especially the CHIVA concept have influenced phlebology for more than a decade. These ideas are not historical but are also a part of new treatment concepts including sclerotherapy and modified surgical procedures. Pre-treatment duplex investigation has become the gold standard. Today, more than ever before, there is a lively discussion and a lot of controversies on how to treat varicose veins best. In the moment there is no definite answer to this question based on published prospective comparative studies. Many questions still remain open and hopefully may be answered in the near future. In these discussions hemodynamic based treatment is always an issue. The chapters of this book are not only well illustrated with excellent color pictures but also based on the actual literature. This book is a mandatory reading for every phlebologist, may she or he be performing CHIVA treatment or not. It is the basis for a better understanding of this concept and for fruitful discussions on the best way of treating varicose veins in the future.
Download or read book Data Analytics and Applications of the Wearable Sensors in Healthcare written by Shabbir Syed-Abdul and published by MDPI. This book was released on 2020-06-17 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a collection of comprehensive research articles on data analytics and applications of wearable devices in healthcare. This Special Issue presents 28 research studies from 137 authors representing 37 institutions from 19 countries. To facilitate the understanding of the research articles, we have organized the book to show various aspects covered in this field, such as eHealth, technology-integrated research, prediction models, rehabilitation studies, prototype systems, community health studies, ergonomics design systems, technology acceptance model evaluation studies, telemonitoring systems, warning systems, application of sensors in sports studies, clinical systems, feasibility studies, geographical location based systems, tracking systems, observational studies, risk assessment studies, human activity recognition systems, impact measurement systems, and a systematic review. We would like to take this opportunity to invite high quality research articles for our next Special Issue entitled “Digital Health and Smart Sensors for Better Management of Cancer and Chronic Diseases” as a part of Sensors journal.
Download or read book Design of Pulse Oximeters written by John G. Webster and published by CRC Press. This book was released on 1997-10-23 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of Pulse Oximeters describes the hardware and software needed to make a pulse oximeter, and includes the equations, methods, and software required for them to function effectively. The book begins with a brief description of how oxygen is delivered to the tissue, historical methods for measuring oxygenation, and the invention of the pulse oximeter in the early 1980s. Subsequent chapters explain oxygen saturation display and how to use an LED, provide a survey of light sensors, and review probes and cables. The book closes with an assessment of techniques that may be used to analyze pulse oximeter performance and a brief overview of pulse oximetry applications. The book contains useful worked examples, several worked equations, flow charts, and examples of algorithms used to calculate oxygen saturation. It also includes a glossary of terms, instructional objectives by chapter, and references to further reading.
Download or read book Handbook of Blood Pressure Measurement written by L. A. Geddes and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last two decades, many new techniques and devices have appeared for measuring blood pressure both directly and indi rectly. At present, there is no single source for this information; nor is there information on the accuracy and sources of error expected with these technologies. It is for this reason that the present book was written. Divided into three parts: direct measurement, indirect (noninvasive) measurement, and history, the book is directed toward a broad audience in the medical and biological sciences. Physicians, nurses, medical students, and psychologists, as well as technical persons in the health care field will find Part One of considerable practical value, because it deals with the subject of the accuracy and fidelity of reproduction of blood pressure waveforms tha t they regularly view on monitors. The definitions of systolic, mean, diastolic, and capillary wedge pressures are illustrated and discussed. The pressures and waveforms at different sites in the cardiovascular system are described in detail. Then the various types of devices for measuring blood pressure are described and thoroughly illustrated. The effect of length and internal diameter of a catheter is analyzed to illustrate how fidelity of reproduction is affected. Simple tests are described that show the reader how to determine the performance characteristics of a catheter-transducer system. The characteristics of catheter-tip transducers are presented, and Part One concludes with a discussion of the rate of change of pressure (dP/dt), what it means, and how such a recording can be calibrated.
Download or read book Physics of the Human Body written by Irving P. Herman and published by Springer. This book was released on 2016-01-09 with total page 963 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively addresses the physics and engineering aspects of human physiology by using and building on first-year college physics and mathematics. Topics include the mechanics of the static body and the body in motion, the mechanical properties of the body, muscles in the body, the energetics of body metabolism, fluid flow in the cardiovascular and respiratory systems, the acoustics of sound waves in speaking and hearing, vision and the optics of the eye, the electrical properties of the body, and the basic engineering principles of feedback and control in regulating all aspects of function. The goal of this text is to clearly explain the physics issues concerning the human body, in part by developing and then using simple and subsequently more refined models of the macrophysics of the human body. Many chapters include a brief review of the underlying physics. There are problems at the end of each chapter; solutions to selected problems are also provided. This second edition enhances the treatments of the physics of motion, sports, and diseases and disorders, and integrates discussions of these topics as they appear throughout the book. Also, it briefly addresses physical measurements of and in the body, and offers a broader selection of problems, which, as in the first edition, are geared to a range of student levels. This text is geared to undergraduates interested in physics, medical applications of physics, quantitative physiology, medicine, and biomedical engineering.
Download or read book Noninvasive Mechanical Ventilation written by ANTONIO ESQUINAS and published by Springer Science & Business Media. This book was released on 2010-08-12 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noninvasive mechanical ventilation is an effective technique for the management of patients with acute or chronic respiratory failure. This comprehensive and up-to-date book explores all aspects of the subject. The opening sections are devoted to theory and equipment, with detailed attention to the use of full-face masks or helmets, the range of available ventilators, and patient-ventilator interactions. Clinical applications are then considered in depth in a series of chapters that address the use of noninvasive mechanical ventilation in chronic settings and in critical care, both within and outside of intensive care units. Due attention is also paid to weaning from conventional mechanical ventilation, potential complications, intraoperative applications, and staff training. The closing chapters examine uses of noninvasive mechanical ventilation in neonatal and pediatric care. This book, written by internationally recognized experts, will be an invaluable guide for both clinicians and researchers.
Download or read book Atlas of Cardiovascular Monitoring written by Jonathan B. Mark and published by . This book was released on 1998 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: An atlas of tracings of the electrocardiogram, arterial blood pressure, central venous pressure, pulmonary artery pressure and electrocardiographic images of the cardiac surgical patient. It illustrates, through the bedside hemodynamic monitor, normal and abnormal cardiac physiology and anatomy as well as diagnostic clues to all common cardiovascular conditions requiring surgical treatment. Interpretation and understanding are the goals of the atlas. It includes excellent line drawings and graphs which are superior to anything else currently available.
