Hypoxia and Cardiorespiratory Control

Hypoxia and Cardiorespiratory Control
Author: Yasumasa Okada
Publisher: Frontiers Media SA
Total Pages: 170
Release: 2022-02-09
Genre: Science
ISBN: 2889743136

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Regulation of Tissue Oxygenation, Second Edition

Regulation of Tissue Oxygenation, Second Edition
Author: Roland N. Pittman
Publisher: Biota Publishing
Total Pages: 117
Release: 2016-08-18
Genre: Medical
ISBN: 1615047212

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This presentation describes various aspects of the regulation of tissue oxygenation, including the roles of the circulatory system, respiratory system, and blood, the carrier of oxygen within these components of the cardiorespiratory system. The respiratory system takes oxygen from the atmosphere and transports it by diffusion from the air in the alveoli to the blood flowing through the pulmonary capillaries. The cardiovascular system then moves the oxygenated blood from the heart to the microcirculation of the various organs by convection, where oxygen is released from hemoglobin in the red blood cells and moves to the parenchymal cells of each tissue by diffusion. Oxygen that has diffused into cells is then utilized in the mitochondria to produce adenosine triphosphate (ATP), the energy currency of all cells. The mitochondria are able to produce ATP until the oxygen tension or PO2 on the cell surface falls to a critical level of about 4–5 mm Hg. Thus, in order to meet the energetic needs of cells, it is important to maintain a continuous supply of oxygen to the mitochondria at or above the critical PO2 . In order to accomplish this desired outcome, the cardiorespiratory system, including the blood, must be capable of regulation to ensure survival of all tissues under a wide range of circumstances. The purpose of this presentation is to provide basic information about the operation and regulation of the cardiovascular and respiratory systems, as well as the properties of the blood and parenchymal cells, so that a fundamental understanding of the regulation of tissue oxygenation is achieved.

Physiology And Pharmacology of Cardio-Respiratory Control

Physiology And Pharmacology of Cardio-Respiratory Control
Author: Albert Dahan
Publisher: Springer Science & Business Media
Total Pages: 230
Release: 2011-06-27
Genre: Medical
ISBN: 9401151296

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On 15 November 1997, the first international symposium "Neural and Chemical Control of Breathing: Pharmacological and Clinical Aspects" was held at Leiden University Medical Center on the occasion of the retirement of one of the members of the Control of Breathing Research Group of the Departments of Physiology and Anesthesiology, Dr. Aad Berkenbosch. Among others, Dr. Berkenbosch, played an important role in this research group, which made a large and significant contribution to scientific research on the regulation of breathing. This book presents the proceedings of that meeting together with papers of several authors who have strong bonds with the Leiden Departments of Physiology and Anesthesiology. All studies represent state of the art work on the subject of respiratory control and cardiovascular medicine, with emphasis on the physiological, pharmacological and anesthesiological aspects of both fields. The book is divided in several sections: Oxygen Physiology. Prof. John Severinghaus presents among other things his ideas on oxygen sensing and high altitude related diseases. Prof. Honda gives results from studies in a unique set of subjects without carotid bodies. The findings of Honda's group support the idea that an intact hypoxic drive from the carotid bodies is necessary for the generation of central hypoxic depression. Dr. Hans van Beek discusses the effects of hypoxia and hypercapnia on cardiac contractility in animal models. Prof. Oeseburg demonstrates the feasibility of Near Infra Red Oximetry for monitoring tissue oxygenation in patients. Central Chemoreception.

Hypoxia in Fish

Hypoxia in Fish
Author: Regina Fritsche
Publisher:
Total Pages: 61
Release: 1993
Genre:
ISBN: 9789162808860

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Cardio-Respiratory Control in Vertebrates

Cardio-Respiratory Control in Vertebrates
Author: Mogens L. Glass
Publisher: Springer Science & Business Media
Total Pages: 543
Release: 2009-07-24
Genre: Science
ISBN: 3540939857

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Hopefully, this book will be taken off of the shelf frequently to be studied carefully over many years. More than 40 researchers were involved in this project, which examines respiration, circulation, and metabolism from ?sh to the land vertebrates, including human beings. A breathable and stable atmosphere ?rst appeared about 500 million years ago. Oxygen levels are not stable in aquatic environments and exclusively water-breathing ?sh must still cope with the ever-changing levels of O 2 and with large temperature changes. This is re?ected in their sophisticated count- current systems, with high O extraction and internal and external O receptors. 2 2 The conquest for the terrestrial environment took place in the late Devonian period (355–359 million years ago), and recent discoveries portray the gradual transitional evolution of land vertebrates. The oxygen-rich and relatively stable atmospheric conditionsimpliedthatoxygen-sensingmechanismswererelativelysimpleandl- gain compared with acid–base regulation. Recently, physiology has expanded into related ?elds such as biochemistry, molecular biology, morphology and anatomy. In the light of the work in these ?elds, the introduction of DNA-based cladograms, which can be used to evaluate the likelihood of land vertebrates and lung?sh as a sister group, could explain why their cardio-respiratory control systems are similar. The diffusing capacity of a duck lung is 40 times higher than that of a toad or lung?sh. Certainly, some animals have evolved to rich high-performance levels.

Hypoxic Respiratory Failure in the Newborn

Hypoxic Respiratory Failure in the Newborn
Author: Shyamala Dakshinamurti
Publisher: CRC Press
Total Pages: 268
Release: 2021-10-29
Genre: Medical
ISBN: 1000442322

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We have all been hypoxic. Fetal tolerance for intrauterine hypoxia arises from evolutionarily conserved physiological mechanisms, the antecedents of which can be learned from diving mammals or species at high altitudes. Understanding fetal hypoxia leads to understanding the huge physiological shifts of neonatal transition and the dangers of perinatal hypoxia. This comprehensive volume of topical review articles by expert authors addresses the origins of hypoxia tolerance, the impact of oxygen on circulatory transition at birth, and the biochemistry of hypoxia in the pulmonary circuit, as well as the classification, diagnosis, and clinical management of hypoxic respiratory failure and persistent pulmonary hypertension in the term neonate. The goal of Hypoxic Respiratory Failure in the Newborn is to connect our understanding of hypoxia from animals in extreme environments, with how the human fetus handles its hypoxic environment; and why the human newborn suddenly cannot. The book will educate health care professionals on how to care for newborns with hypoxic respiratory failure, including the use of up-to-date diagnostic tools and therapies. It also highlights areas of controversy and ongoing research in hypoxic respiratory failure and pulmonary hypertension of the newborn, including challenging case studies. Key Features Explores evolutionary context and comparative physiology of hypoxia tolerance in the fetus and neonate, from basic research to clinical scenarios Provides guidance to trainees, physicians, and allied health professionals engaged in NICU care; pediatricians, cardiologists, pulmonologists, anesthesiologists, neonatologists, and physiologists to effectively manage infants in hypoxic respiratory failure Includes case scenarios emphasizing current diagnostic and therapeutic controversies and algorithmic approaches to decipher difficult clinical cases

Cardiovascular Control of and Responses to Vasoconstrictor Hormones During Hypoxia

Cardiovascular Control of and Responses to Vasoconstrictor Hormones During Hypoxia
Author:
Publisher:
Total Pages: 0
Release: 1997
Genre:
ISBN:

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The purpose of these studies is to determine factors affecting blood pressure (BP) maintenance during hemorrhage and the consequences on O2 delivery (O2del). The scope covers the cardiovascular, oxygen delivery, and hormonal responses to hemorrhage while breathing hyperoxic, normoxic and hypoxic air mixtures, in conscious goats. Additionally, the role of the hormonal responses, particularly vasopressin (AVP) and angiotensin II, on the cardiovascular and O2del responses is being investigated. We have shown that a controlled hemorrhage at 0.5 ml/kg/min for 30 min conducted in the same goats while exposed to either 11, 21, and 100% FIO2, reduced mean arterial BP by approximately 25, 15, and 5 mmHg respectively. Improved maintenance of BP during hyperoxia was achieved, in part, by an earlier rise in systemic vascular resistance, and O2 consumption was similar in all experiments following hemorrhage. Presence of the spleen did not affect the magnitude of drop in BP, O2del, nor hormonal responses to the hemorrhage during normoxic conditions. Other experiments involved responses to i.v. infusions of AVP during 11 or 21% FIO2. AVP increased the arterial O2 concentration during hypoxia as expected, but the AVP-induced decrease in cardiac output prevented an improvement in O2del. Neither hypoxia nor the rate of AVP infusion affected whole body AVP clearance.

Hypoxia

Hypoxia
Author: Robert C. Roach
Publisher: Springer Science & Business Media
Total Pages: 448
Release: 2013-04-17
Genre: Medical
ISBN: 1475734018

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Hypoxia remains a constant threat throughout life. It is for this reason that the International Hypoxia Society strives to maintain a near quarter century tradition of presenting a stimulating blend of clinical and basic science discussions. International experts from many fields have focused on the state-of-the-art discoveries in normal and pathophysiological responses to hypoxia. Topics in this volume include gene-environment interactions, a theme developed in both a clinical context regarding exercise and hypoxia, as well as in native populations living in high altitudes. Furthermore, experts in the field have combined topics such as skeletal muscle angiogenesis and hypoxia, high altitude pulmonary edema, new insights into the biology of the erythropoietin receptor, and the latest advances in cardiorespiratory control in hypoxia. This volume explores the fields of anatomy, cardiology, biological transport, and biomedical engineering among many others.

Surviving Hypoxia

Surviving Hypoxia
Author: Peter W. Hochachka
Publisher: CRC Press
Total Pages: 587
Release: 2022-11-30
Genre: Medical
ISBN: 1000714217

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Surviving Hypoxia: Mechanisms of Control and Adaptation is a synthesis of findings and thoughts concerning hypoxia. The thermodynamics of hypoxia are discussed in detail, including acid-base balance and self-pollution resulting from the accumulation of anaerobic end-products. The book focuses on descriptions and discussions of common facets, contrasting solutions in a variety of physiological hypoxia defense strategies, including those shown by plants, invertebrates, and vertebrates. Special treatment is given to the distinctive problems that hypoxia presents to vulnerable organs such as the kidney, liver, and brain. It also addresses pathological events in addition to protective mechanisms. Clinical implications of basic research are examined in the book, which provides new insights into underlying pathological processes occuring in hypoxic-induced organ failure and indicates new paths for successful clinical intervention. Surviving Hypoxia: Mechanisms of Control and Adaptation is an excellent reference for all researchers interested in the physiological effects of hypoxia, underlying pathological events, and protective mechanisms.