*  Preoperative gender differences in pulmonary gas exchange in morbidly obese subjects.
BACKGROUND: Morbidly obese men may have poorer pulmonary gas exchange compared to morbidly obese women (see Zavorsky et al., Chest 131:362-367, 2007). The purpose was to compare pulmonary gas exchange in morbidly obese men and women at rest and throu
*  Method for determination of pulmonary gas exchange in connection with birth.
An apparatus built on the 'open' system for determination of pulmonary gas exchange in the newborn infant after birth is described. At four-minute intervals diluted expired air (5-7 1/min) was collected in bags. The oxygen and carbon dioxide fraction
*  Effect of Inverse I :E Ratio Ventilation on Pulmonary Gas Exchange in Acute Respiratory Distress Syndrome | Anesthesiology |...
Our results are in keeping with those of previous studies [13,14] that have shown that PC-IRV did not improve PaO2compared with traditional CMV with PEEP, when the comparison is made at equal levels of PEEP, while keeping the other ventilator variables constant. Lessard et al. [14] also observed a lower PaO2with PC-IRV compared with conventional ventilation with PEEP. Similarly, these authors did not find a significant change in cardiac output with PC-IRV. Mercat et al. [13] and Lessard et al. [14] used higher levels of PEEPtthan in the present study, namely from 11 to 14 cmH2O. This, however, indicates that our negative results with IRV cannot be attributed to insufficient PEEPt. [6] We cannot compare our results obtained with inverse I:E ratio ventilation with those of most previous studies because of lack of information on the level of PEEPtused due to uncontrolled modifications in the ventilator settings after implementation of IRV. Clearly, we cannot exclude the possibility that different ...
*  Gas exchange responses to constant work-rate exercise in patients with glycogenosis type V and VII.
During constant work-rate exercise above the lactic acidosis threshold, oxygen consumption fails to plateau by 3 minutes, but continues to rise slowly. This slow component correlates closely with the rise in lactate in normal subjects. We investigate
*  Leaf gas exchange responses of 13 prairie grassland species to elevated CO2 and increased nitrogen supply - Lee - 2001 - New...
All species, regardless of functional group, showed pronounced photosynthetic acclimation to elevated CO2, resulting in minimal stimulation of photosynthesis (A) averaging +15% in C3 grasses, +8% in forbs, +7% in legumes and −2% in C4 grasses. The effects of CO2 and soil N supply did not interact for any leaf traits measured. Elevated CO2 consistently decreased stomatal conductance (gs) leading to 40% increase in A/gs ...
*  Effects of priming exercise on V·O2 kinetics and the power-duration relationship
Purpose: To investigate the influence of prior heavy- and severe-intensity exercise on the oxygen uptake (V·O2) kinetics and the power-duration relationship. Methods: Ten cyclists performed 13 exercise tests over a 4 week period, consisting of a ramp test to determine the gas exchange threshold (GET) and the peak V·O2, followed by a series of square-wave tests to exhaustion under three conditions: no prior exercise (control), prior heavy exercise (6 min at a work rate above GET but below critical power (CP)) and prior severe exercise (6 min at a work rate above the CP). Pulmonary gas exchange was measured throughout the exhaustive exercise bouts and the parameters of the power duration relationship (CP and the curvature constant, W) were determined from the linear work-time model. Results: Prior heavy exercise increased the amplitude of the primary V·O2 response (by ~0.19 ± 0.28 L·min-1, P = 0.001), reduced the slow ...
*  Plus it
This study demonstrates that inert gases of all blood solubilities exchange in the airways and that exchange increases with increasing solubility. This effect complicates the interpretation of techniques that use highly soluble gases to evaluate lung function, such as MIGET. MIGET uses six inert gases with blood solubilities that span six orders of magnitude to evaluate the efficiency of alveolar gas exchange. On the basis of early models of pulmonary gas exchange, MIGET assumes that all gases exchange completely in the alveoli, thereby ignoring the effects of airway gas exchange. This study demonstrates that airway exchange may affect MIGET-derived ventilation and perfusion distributions but does not provide sufficient ...
*  Evaluation of Gas Exchange by the Measurement of Lung Diffusion for Carbon Monoxide During General Anaesthesia - Full Text View...
Mechanical ventilation is a therapeutic method used in order to keep gas exchange adequate to cell metabolism in patients with acute respiratory failure. It is currently proved that, although on one hand the use of this method keeps gas exchange, on the other hand it promotes and supports pulmonary inflammatory processes (VILI). A recent study about the effect of positive end-expiratory pressure (PEEP) on DLCO (diffusing capacity of the lung for carbon monoxide) in patients undergoing invasive mechanical ventilation has proved that patients without any evident pulmonary disease (negative medical history, negative chest clinical examination, normal chest X-ray radiography and normal arterial oxygen tension [PaO2]) after 24 hours of invasive mechanical ventilation show a significant worsening of pulmonary gas exchange ...
*  Effect of smoking on exhaled nitric oxide and flow-independent nitric oxide exchange parameters | European Respiratory Society
The main finding of the present study is that current smoking is associated with a reduction in Caw,NO and CA,NO. It was also found that ex-smokers exhibited lower levels of exhaled NO than never-smokers, which was reflected in a lower J'aw,NO, and that passive smoking was associated with increased CA,NO. A surprising and novel finding was that, in ex-smokers, snus consumption was associated with a reduction in Caw,NO and an increase in Daw,NO.. The model used in the present article to determine the NO flow-independent parameters has been validated 19 against the classical slope-intercept model 23. The choice of flow rates and method used to analyse the data affects the estimation of NO flow-independent parameters 13. Decreasing the highest flow rate increased the estimated CA,NO in a recent article that used a linear regression method and FeNO measurements at three flow rates ranging 100-200 mL·s-1 24. The choice of lowest flow rate affects the estimation of Caw,NO and Daw,NO, and, ...
*  Pulmonary Gas Exchange and Acid‐Base Balance During Exercise - Comprehensive Physiology
As the first step in the oxygen‐transport chain,the lung has a critical task: optimizing the exchange of respiratory gases to maintain delivery of oxygen and the elimination of carbon dioxide
*  Clinical assessment of a rebreathing method for measuring pulmonary gas transfer. | Thorax
A rebreathing method for measuring carbon monoxide transfer factor (TLCO) and transfer coefficient (KCO) is evaluated. The test was performed on 42 subjects. Seventeen of these had normal lung function while the remainder suffered from various conditions, most having fibrosing alveolitis. No patients with severe airways obstruction were included in the group. The results were compared with single-breath measurements and close correlations were found between single-breath KCO and rebreathing KCO (r = 0.78, p less than 0.001) and between single-breath TLCO and rebreathing TLCO (r = 0.97, p less than 0.001). The reasons for discrepancies between single-breath and rebreathing values are discussed. It is concluded that measurement of rebreathing gas transfer is a useful supplement to routine tests of lung function, particularly in breathless patients with a small vital capacity.. ...
*  PLOS ONE: Developing Pulmonary Vasculopathy in Systemic Sclerosis, Detected with Non-Invasive Cardiopulmonary Exercise Testing
Background Patients with systemic sclerosis (SSc) may develop exercise intolerance due to musculoskeletal involvement, restrictive lung disease, left ventricular dysfunction, or pulmonary vasculopathy (PV). The latter is particularly important since it may lead to lethal pulmonary arterial hypertension (PAH). We hypothesized that abnormalities during cardiopulmonary exercise testing (CPET) in patients with SSc can identify PV leading to overt PAH. Methods Thirty SSc patients from the Harbor-UCLA Rheumatology clinic, not clinically suspected of having significant pulmonary vascular disease, were referred for this prospective study. Resting pulmonary function and exercise gas exchange were assessed, including peakVO2, anaerobic threshold (AT), heart rate- VO2 relationship (O2-pulse), exercise breathing reserve and parameters of ventilation-perfusion ...
*  Animal / Plant Gas Exchange. - GCSE Science - Marked by Teachers.com
Introduction. Animal/Plant Gas Exchange Our planet is lively in many ways. Everything on Earth is part of one system, so Gas Exchange could be discussed under Cycles, Interliving, or under Balance. Everything really is connected to everything else. Every living organism must exchange gases to stay alive. We each take in a gas (breathing) we need from the atmosphere, use it to make food or transform food, and release the leftover part of the gas, which the living cells have chemically changed into a different gas. Animals take in oxygen gas, transfer it to their blood, and carry it to every cell, where it is used to transform food into energy, where carbon dioxide gas is created as a by-product or leftover. ...read more. Middle. The diagram below show the circle of gas exchange between ...
*  PULMONARY GAS EXCHANGE | Anesthesiology | ASA Publications
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*  Effects of human pregnancy and aerobic conditioning on alveolar gas exchange during exercise.
This study examined the effects of aerobic conditioning during the second and third trimesters of human pregnancy on ventilatory responses to graded cycling. Previously sedentary pregnant women were assigned randomly to an exercise group (n = 14) or
*  bostongop: Nursing Diagnoses For Asthma Impaired Gas Exchange R T Impaired Gas
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*  karl-cromok: Impaired Gas Exchange - Nursing Diagnosis amp; Care Plan Nurseslabs
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*  6.4 Gas exchange - BIOLOGY4IBDP
The oxygen in the lungs diffuse into the bloodstream and the carbon di oxide in the blood stream diffuses into the lungs. Each breath we take replenishes the supply of gases within the lung tissues so that diffusion continues. This process is called gas exchange ...
*  Impaired Gas Exchange
Impaired Gas Exchange (_)Actual (_) Potential Related To:[Check those that apply] (_) Anesthesia (_) Allergic response (_) Altered level of consciousness (_) Anxiety (_) Aspiration (_) Decreased lung compliance (_) Edema …
*  Chapters 42 - CHAPTER 4 2 CIRCULATION AND GAS EXCHANGE OUTLINE I II Circulation in Animals A Transport systems functionally...
View Notes - Chapters 42 from BIOL 119 at SUNY Geneseo. CHAPTER 4 2 CIRCULATION AND GAS EXCHANGE OUTLINE I. II. Circulation in Animals A. Transport systems functionally connect the organs of exchange
*  PPT - Chapter 42: Gas Exchange and Circulatory System PowerPoint Presentation - ID:3224488
Chapter 42: Gas Exchange and Circulatory System. Presented by: McQuade and Verpooten. Circulatory Systems Reflect Phylogeny. In unicellular organisms Exchanges occur directly with the environment For most of the cells making up multicellular organisms Slideshow 3224488 by xenon
*  How are the lungs and capillaries involved in gas exchange ? | eNotes
Get an answer for 'How are the lungs and capillaries involved in gas exchange ?' and find homework help for other Science questions at eNotes
*  Circulatory and Respiratory System by Shanna Shocklee on Prezi
Blood (part of the circulatory system) is responsible for getting oxygen to the body cells for respiration. What happens during gas exchange? -After air enters an alveolus, oxygen passes through the wall of the alveolus and then through the capillary wall into the blood. Similarly, carbon dioxide and water pass from the blood into the air in the alveolus. The whole process is called gas exchange. 7th Grade Science Circulatory and Respiratory System What is the role of the heart? How do you Breath? Breathing Structures -BREATHING STRUCTURES ...
*  Asthma and Impaired Gas Exchange | allnurses
Hi everyone, I have no idea if this is the right place to put this question so hopefully it is! I have an assessment for uni (I'm first year BN student) due in 10 days in which I have to do a care