Regulation of Tissue Oxygenation, Second Edition
Regulation of Tissue Oxygenation, Second Edition

Author: Roland N. Pittman

Publisher: Biota Publishing

Published: 2016-08-18

Total Pages: 117

ISBN-13: 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.

Physiological and Pathological Responses to Hypoxia and High Altitude
Physiological and Pathological Responses to Hypoxia and High Altitude

Author: Rodrigo Iturriaga

Publisher: Frontiers Media SA

Published: 2020-06-22

Total Pages: 387

ISBN-13: 2889638006

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The appearance of photosynthetic organisms about 3 billion years ago increased the partial pressure of oxygen (PO2) in the atmosphere and enabled the evolution of organisms that use glucose and oxygen to produce ATP by oxidative phosphorylation. Hypoxia is commonly defined as the reduced availability of oxygen in the tissues produced by different causes, which include reduction of atmospheric PO2 as in high altitude, and secondary to pathological conditions such as sleep breathing and pulmonary disorders, anemia, and cardiovascular alterations leading to inadequate transport, delivery, and exchange of oxygen between capillaries and cells. Nowadays, it has been shown that hypoxia plays an important role in the genesis of several human pathologies including cardiovascular, renal, myocardial and cerebral diseases in fetal, young and adult life. Several mechanisms have evolved to maintain oxygen homeostasis. Certainly, all cells respond and adapt to hypoxia, but only a few of them can detect hypoxia and initiate a cascade of signals intended to produce a functional systemic response. In mammals, oxygen detection mechanisms have been extensively studied in erythropoietin-producing cells, chromaffin cells, bulbar and cortical neurons, pulmonary neuroepithelial cells, smooth muscle cells of pulmonary arteries, and chemoreceptor cells. While the precise mechanism underpinning oxygen, sensing is not completely known several molecular entities have been proposed as possible oxygen sensors (i.e. Hem proteins, ion channels, NADPH oxidase, mitochondrial cytochrome oxidase). Remarkably, cellular adaptation to hypoxia is mediated by the master oxygen-sensitive transcription factor, hypoxia-inducible factor-1, which can induce up-regulation of different genes to cope the cellular effects related to a decrease in oxygen levels. Short-term responses to hypoxia included mainly chemoreceptor-mediated reflex ventilatory and hemodynamic adaptations to manage the low oxygen concentration while more prolonged exposures to hypoxia can elicit more sustained physiological responses including switch from aerobic to anaerobic metabolism, vascularization, and enhancement of blood O2 carrying capacity. The focus of this research topic is to provide an up-to-date vision on the current knowledge on oxygen sensing mechanism, physiological responses to acute or chronic hypoxia and cellular/tissue/organ adaptations to hypoxic environment.

High Altitude Physiology and Medicine
High Altitude Physiology and Medicine

Author: W. Brendel

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 322

ISBN-13: 1461256399

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High altitude physiology and medicine has again become important. The excep tional achievements of mountaineers who have climbed nearly all peaks over 8,000 m without breathing equipment raise the question of maximal adaptation ca pacity of man to low oxygen pressures. More importantly, the increase in tourism in the Andes and the Himalayas brings over 10,000 people to sites at altitudes above 4,000 and 5,000 m each year. At such heights several kinds of high alti tude diseases are likely to occur, and these complications require detailed medical investigations. Medical authorities need to inform both mountaineers and tourists as to how great a physical burden can be taken in the mountain environment without risk to health. Physicians need to know what kind of prophylaxis is to be employed at high altitudes to prevent the development of diseases and what therapeutic measures should be used once high altitude diseases have occurred. Moreover, the physical condition of the indigenous population living at higher altitudes such as the Andes and the Himalayas, who are exposed continuously to the stress of high altitude, requires our attention. We have become familiar with symptoms characteristic of chronic high-altitude disease: under special conditions this popu lation has a tendency to develop pulmonary hypertension, which is associated with pulmonary edema, pulmonary congestion, and right heart failure.

Plant Responses to Hypoxia
Plant Responses to Hypoxia

Author: Elena Loreti

Publisher: MDPI

Published: 2021-03-02

Total Pages: 288

ISBN-13: 3036501487

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Molecular oxygen deficiency leads to altered cellular metabolism and can dramatically reduce crop productivity. Nearly all crops are negatively affected by a lack of oxygen (hypoxia) due to adverse environmental conditions such as excessive rain and soil waterlogging. Extensive efforts to fully understand how plants sense oxygen deficiency and their ability to respond using different strategies are crucial to increase hypoxia tolerance. Progress in our understanding has been significant in recent years. This topic certainly deserves more attention from the academic community; therefore, we have compiled a series of articles reflecting the advancements made thus far.

Oxygen Sensing
Oxygen Sensing

Author:

Publisher: Elsevier

Published: 2004-05-10

Total Pages: 867

ISBN-13: 0080497195

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The ability of cells to sense and respond to changes in oxygenation underlies a multitude of developmental, physiological, and pathological processes. This volume provides a comprehensive compendium of experimental approaches to the study of oxygen sensing in 48 chapters that are written by leaders in their fields.

High Altitude Medicine and Physiology 5E
High Altitude Medicine and Physiology 5E

Author: John West

Publisher: CRC Press

Published: 2012-11-29

Total Pages: 541

ISBN-13: 1444154338

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A comprehensive update to this preeminent and accessible text, this fifth edition of a bestseller was developed as a response to man's attempts to climb unaided to higher altitudes and to spend more time in these conditions for both work and recreation. It describes the ever-expanding challenges that doctors face in dealing with the changes in huma

Complications in Neuroanesthesia
Complications in Neuroanesthesia

Author: Hemanshu Prabhakar

Publisher: Academic Press

Published: 2016-02-11

Total Pages: 502

ISBN-13: 0128041137

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Complications in Neuroanesthesia focuses on complications that may arise related to neuroanesthesia practice and discusses its various causes. Each complication is written as a separate chapter, and the pathophysiology and mechanisms of each complication, as well as measures for diagnosis, treatment and prevention are discussed. Towards the end of the book, several case scenarios are provided to the readers that challenge readers to diagnose the possible complication for each case. Chapters include brain and spinal cord problems, cardiovascular and hematological problems, and nerve and muscle problems. Written in a standard format, Complications in Neuroanesthesia provides quick and easy access to understanding problems in neuroanesthesia. It provides insight into all possible complications occurring during perioperative management of neurosurgical and neurologic patients. It is useful for trainees, clinicians, and researchers in the fields of neurosurgery, neurocritical care, and neurology by providing an understanding of preventable mishaps that may occur in neurosurgical or neurologic patients. - Quick and easy reference for understanding problems in neuroanesthesia - Provides comprehensive insights into all possible complications occurring during perioperative management of neurosurgical and neurologic patients - Includes useful section with clinical case studies of complications in neuroanesthesia

Basic Physiology for Anaesthetists
Basic Physiology for Anaesthetists

Author: David Chambers

Publisher: Cambridge University Press

Published: 2019-07-25

Total Pages: 469

ISBN-13: 1108463991

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Easily understood, up-to-date and clinically relevant, this book provides junior anaesthetists with an essential physiology resource.

Hypoxia
Hypoxia

Author: Robert C. Roach

Publisher: Springer Science & Business Media

Published: 2002-01-31

Total Pages: 466

ISBN-13: 9780306466960

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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.