نتایج جستجو برای: hemoglobin oxygen saturation

تعداد نتایج: 295909  

2017
Roberta Pulcheri Ramos

1. Disciplina de Pneumologia, Universidade Federal de São Paulo, São Paulo (SP) Brasil. Tissues obtain energy primarily from oxygen. Adequate oxygen levels in the inhaled air and a preserved ventilation/ perfusion ratio (V • /Q) are the major determinants of oxygen supply to the blood. However, peripheral supply depends on effective oxygen transport to the tissue mitochondria, a critical task t...

1999
Gregory Z. Bolen Gary E. Anderson Jeffrey B. Riley Robin G. Sutton David G. Bishop

-----------------Three devices used to measure hemoglobin oxygen saturation in the extracorporeal circuit were studied and compared to a control. The Baxter Bentley OxySat, Oximetrix Accusat, and the Radiometer ABL4 blood gas monitor were compared to a control, the IL 282 CoOximeter. Fifty one sample points were obtained during all phases of cardiopulmonary bypass with results as follows: TABLE...

Journal: :Science 1987
A Mozzarelli J Hofrichter W A Eaton

A laser photolysis technique has been developed to assess the quantitative significance of the delay time of hemoglobin S gelation to the pathophysiology of sickle cell disease. Changes in the saturation of hemoglobin S with carbon monoxide produced by varying the intensity of a photolytic laser beam were used to simulate changes in the saturation of oxyhemoglobin S produced by variations in ox...

Journal: :Anesthesia and analgesia 1997
C D Kurth B Uher

Near-infrared spectroscopy (NIRS) is a noninvasive optical technique to monitor cerebral oxygen saturation at the bedside. Despite its applicability, NIRS has had limited clinical use because of concerns about accuracy, noted by intersubject variability in slope and intercept of the line between NIRS- and weighted-average arterial-cerebrovenous saturation (SMO2). This study evaluated transcrani...

2005
Ernest Beutler

T HE RELATIONSHIP between oxygen tension and the sickling phenomenon has been recognized for over 45 years’ and has become central to our thinking about sickle cell disease. It has been emphasized that sickling of red cells depends to a large degree upon the absolute concentration of reduced sickle hemoglobin.2 In the past two decades many therapeutic strategies have been explored in the manage...

2007
Pamela K. Shiao

www.ajcconline.org • BACKGROUND Pulse oximetry is commonly used to monitor oxygenation in neonates, but cannot detect variations in hemoglobin. Venous and arterial oxygen saturations are rarely monitored. Few data are available to validate measurements of oxygen saturation in neonates (venous, arterial, or pulse oximetric). • PURPOSE To validate oxygen saturation displayed on clinical monitors ...

2005
Ernest Beutler

T HE RELATIONSHIP between oxygen tension and the sickling phenomenon has been recognized for over 45 years’ and has become central to our thinking about sickle cell disease. It has been emphasized that sickling of red cells depends to a large degree upon the absolute concentration of reduced sickle hemoglobin.2 In the past two decades many therapeutic strategies have been explored in the manage...

Journal: :The Journal of biological chemistry 1949
J B HICKAM R FRAYSER

Gasometric methods for estimating blood oxygen are time-consuming. This consideration often limits the number of observations which can be made in the course of experiments requiring oxygen determinations. In many cases it is an arteriovenous difference which is particularly desired, as in the measurement of cardiac output by the Fick principle, or the estimation of oxygen consumption by human ...

2005
Ernest Beutler

T HE RELATIONSHIP between oxygen tension and the sickling phenomenon has been recognized for over 45 years’ and has become central to our thinking about sickle cell disease. It has been emphasized that sickling of red cells depends to a large degree upon the absolute concentration of reduced sickle hemoglobin.2 In the past two decades many therapeutic strategies have been explored in the manage...

Journal: :Stroke 1991
P W McCormick M Stewart M G Goetting G Balakrishnan

Regional cerebrovascular oxygen saturation, a quantitative measure of hemoglobin saturation in the combined arterial, venous, and microcirculatory compartments of the brain, can be measured noninvasively with near infrared spectroscopy. We assessed the sensitivity of this aggregate saturation to cerebral hypoxia during transient cerebral hypoxic hypoxia in seven human subjects. Regional cerebro...

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