The Interval Force Relationship Of The Heart
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The Interval Force Relationship Of The Heart
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Author : Mark I. M. Noble
language : en
Publisher: Cambridge University Press
Release Date : 1992-08-27
The Interval Force Relationship Of The Heart written by Mark I. M. Noble and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-08-27 with Medical categories.
This 1992 volume examines the important relationship, initially studied in 1871 by Bowditch, between the strength of the heartbeat and the interval between beats.
Heart Rate Variability Clinical Applications And Interaction Between Hrv And Heart Rate
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Author : Karin Trimmel
language : en
Publisher: Frontiers Media SA
Release Date : 2015-10-07
Heart Rate Variability Clinical Applications And Interaction Between Hrv And Heart Rate written by Karin Trimmel and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-07 with Electronic book categories.
Over the last decades, assessment of heart rate variability (HRV) has increased in various fields of research. HRV describes changes in heartbeat intervals, which are caused by autonomic neural regulation, i.e. by the interplay of the sympathetic and the parasympathetic nervous systems. The most frequent application of HRV is connected to cardiological issues, most importantly to the monitoring of post-myocardial infarction patients and the prediction of sudden cardiac death. Analysis of HRV is also frequently applied in relation to diabetes, renal failure, neurological and psychiatric conditions, sleep disorders, psychological phenomena such as stress, as well as drug and addiction research including alcohol and smoking. The widespread application of HRV measurements is based on the fact that they are noninvasive, easy to perform, and in general reproducible – if carried out under standardized conditions. However, the amount of parameters to be analysed is still rising. Well-established time domain and frequency domain parameters are discussed controversially when it comes to their physiological interpretation and their psychometric properties like reliability and validity, and the sensitivity to cardiovascular properties of the variety of parameters seems to be a topic for further research. Recently introduced parameters like pNNxx and new dynamic methods such as approximate entropy and detrended fluctuation analysis offer new potentials and warrant standardization. However, HRV is significantly associated with average heart rate (HR) and one can conclude that HRV actually provides information on two quantities, i.e. on HR and its variability. It is hard to determine which of these two plays a principal role in the clinical value of HRV. The association between HRV and HR is not only a physiological phenomenon but also a mathematical one which is due to non-linear (mathematical) relationship between RR interval and HR. If one normalizes HRV to its average RR interval, one may get ‘pure’ variability free from the mathematical bias. Recently, a new modification method of the association between HRV and HR has been developed which enables us to completely remove the HRV dependence on HR (even the physiological one), or conversely enhance this dependence. Such an approach allows us to explore the HR contribution to the clinical significance of HRV, i.e. whether HR or its variability plays a main role in the HRV clinical value. This Research Topic covers recent advances in the application of HRV, methodological issues, basic underlying mechanisms as well as all aspects of the interaction between HRV and HR.
The Stressed Heart
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Author : Marianne J. Legato
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Stressed Heart written by Marianne J. Legato and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Medical categories.
The Stressed Heart is truly unique in concept and will provide an eXCItmg adventure to the reader no matter what his or her field of expertise and interest. The title, although quite appropriate, does not adequately indicate the range of topics considered or the rational interrelationships among them. Indeed, perhaps the most important point to be learned from the book is that a serious consideration of the response of the heart to mechanical overload, ischemia, or excessive humoral stimuli must include evaluation of each of the topics in the table of contents. The heart responds to stress through alterations in both structure and function. How these changes are brought about is the subject of the initial chapters. These consider first the normal regulation of gene expression in the heart, the rapid response to mechanical overload that leads to both quantitative and qualitative changes in the contractile proteins, and our current understand ing of the signals that might be elicited by stress and alter gene expression. One chapter emphasizes the fact that, regardless of the nature of the stress, the common denominator is a discrepancy between energy requirements and expenditure. The central role of cellular acidosis in initiating the sequence of responses to stress and the possible roles of peptide regulators of transcription and protein regulators of translation are considered in detail.
Systolic And Diastolic Function Of The Heart
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Author : Neil B. Ingels
language : en
Publisher: IOS Press
Release Date : 1996
Systolic And Diastolic Function Of The Heart written by Neil B. Ingels and has been published by IOS Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Medical categories.
Chapter 22: Crossbridge and Muscle Properties, Energetics, and Pressure-Volume Area -- Chapter 23: Constancy and Variability of Oxygen Costs of Mechanical Energy (PVA) and Contractility (Emax) -- Chapter 24: Tight Coupling between Regional Myocardial Oxygen Consumption and Contractile Function -- Chapter 25: Force-Frequency Relation, Force-Interval Relation, and Mechanical Restitution -- Chapter 26: Elastance-Based Mechanical Restitution Provides Data from the Intact Heart Not Available from Any Other Technique -- Chapter 27: Contractility Indices -- Chapter 28: Searching for Indices of Contractility Is Counterproductive -- Chapter 29: Rapid Contractile Upregulation Rematches Stroke Work to Increased Afterload Independent of Ventricular Geometry, Afterload-Related Coronary Perfusion Pressure Fluctuations and Baseline Contractile State -- Chapter 30: Wall Thickening, Shears, and Cleavage Planes -- Chapter 31: Mechanisms of Large Ventricular Wall Shortening and Thickening -- Chapter 32: Twisting, Torsion, and Other Shears -- Chapter 33: Ventricular Twist and Its Relationship to Pressure Volume and Shortening -- Chapter 34: Differences in Systolic and Diastolic Torsional Deformation of the Left Ventricle -- Chapter 35: Coronary Flow, Systolic Perfusion, and the "Gregg Phenomenon -- Chapter 36: Intramyocardial Hydraulic Regulation of Cardiac Mechanics and Energetics -- Chapter 37: Left Ventricular Afterload and Arterial Coupling -- Indexes -- Author Index -- Affiliation Index -- Subject Index
Cardiac Repolarization
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Author : Ihor Gussak
language : en
Publisher: Springer Science & Business Media
Release Date : 2003-03-13
Cardiac Repolarization written by Ihor Gussak and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-03-13 with Medical categories.
A comprehensive review of all the latest developments in cardiac electrophysiology, focusing on both the clinical and experimental aspects of ventricular repolarization, including newly discovered clinical repolarization syndromes, electrocardiographic phenomena, and their correlation with the most recent advances in basic science. The authors illuminate the basic electrophysiologic, molecular, and pharmacologic mechanisms underlying ventricular repolarization, relate them to specific disease conditions, and examine the future of antiarrhythmic drug development based on both molecular and electrophysiological properties. They also fully review the clinical presentation and management of specific cardiac repolarization conditions.
Mechanisms Of Contraction Of The Normal And Failing Heart
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Author : Eugene Braunwald
language : en
Publisher:
Release Date : 1968
Mechanisms Of Contraction Of The Normal And Failing Heart written by Eugene Braunwald and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Heart categories.
The Relationship Between Stimulus Oriented Changes In Heart Rate And Detection Efficiency In A Vigilance Task
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Author : Austin W. Kibler
language : en
Publisher:
Release Date : 1968
The Relationship Between Stimulus Oriented Changes In Heart Rate And Detection Efficiency In A Vigilance Task written by Austin W. Kibler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Attention categories.
The study was designed to assess the relationship between detection efficiency and beat-to-beat changes in heart rate around task stimuli in a vigilance task. Thirty-six subjects, instrumented for continuous recording of EKG and respiration, individually stood a 96 minute vigil. They monitored a light which flashed on (stimulus event) for 500ms. once every 6.0 seconds and were to report the occasional brighter flashes (signals). Half of the subjects (high signal density group) received 240 signals; the remaining 18 subjects (low signal density group) received but 16 signals. By urging the subjects to do their best, a motivational condition was induced in a six minute post-test. As expected, detection efficiency was higher and better sustained by the high signal density group. Detection efficiency of the low signal density group decayed appreciably over time. In the motivational post-test condition the performance of both groups improved significantly. Measures of changes in heart rate, analyzed both in terms of overall shifts in heart rate over the vigil and beat-to-beat changes in heart rate around each stimulus event, revealed: (1) The median heart rate in succeeding quarters of the vigil, did not differ significantly between the two groups. (2) Heart rate preceding a stimulus event decelerated. (3) In the post-test the significant recovery in detection efficiency was accompanied by an increase in the magnitude of stimulus-oriented cardiac deceleration and by a decrease in overall heart rate. (Author).
Dukes Physiology Of Domestic Animals
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Author : William O. Reece
language : en
Publisher: John Wiley & Sons
Release Date : 2015-04-01
Dukes Physiology Of Domestic Animals written by William O. Reece and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-01 with Medical categories.
This fully revised new edition of the classic reference ondomestic animal physiology provides detailed descriptions of animalfunction and dysfunction, with an emphasis on clinical relevanceand pedagogical features to enhance learning. • Presents in-depth, comprehensive descriptions ofdomestic animal function and dysfunction • Emphasizes clinical relevance, with clinicalcorrelations, notes of relevance, and self-assessment questionsfeaturing situations likely to be faced in practice • Offers pedagogical features, including chapteroutlines and introductions, key terms throughout the book,additional images, questions to enhance learning, andself-assessment exercises • Distills the most useful information for ease of use,with improved continuity and reduced repetition • Includes a companion website offering review questionsand answers and the figures from the book in PowerPoint
Abc Of Clinical Electrocardiography
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Author : Francis Morris
language : en
Publisher: John Wiley & Sons
Release Date : 2009-04-15
Abc Of Clinical Electrocardiography written by Francis Morris and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-04-15 with Medical categories.
Electrocardiography is an essential tool in diagnosing cardiacdisorders. This second edition of the ABC of ClinicalElectrocardiography allows readers to become familiar with the widerange of patterns seen in the electrocardiogram in clinicalpractice and covers the fundamentals of ECG interpretation andanalysis. Fully revised and updated, this edition includes a self-assessmentsection to aid revision and check comprehension, clear anatomicaldiagrams to illustrate key points and a larger format to show12-lead ECGs clearly and without truncation. Edited and written by leading experts, the ABC of ClinicalElectrocardiography is a valuable text for anyone managing patientswith heart disorders, both in general practice and in hospitals.Junior doctors and nurses, especially those working in cardiologyand emergency departments, as well as medical students, will findthis a vaulable introduction to the understanding of this keyclinical tool.
Starling S Law Of The Heart Revisited
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Author : Henk Keurs
language : en
Publisher:
Release Date : 1988-10-31
Starling S Law Of The Heart Revisited written by Henk Keurs and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-10-31 with categories.