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157 results for “gas exchange”
Evaluation of Gas Exchange by the Measurement of Lung Diffusion for Carbon Monoxide During General Anaesthesia
ClinicalTrials.gov study NCT01503879. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Optimizing and Standardizing 129Xe Gas Exchange MRI to Visualize Regional Therapy Response in Interstitial Lung Disease
ClinicalTrials.gov study NCT04855305. IPD Sharing: YES. Countries: 1. Publications: 0.
Sinonasal Gas Exchange Dynamics
ClinicalTrials.gov study NCT01671098. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Assessing Gas Exchange in Intensive Care Patients on a Ventilator
ClinicalTrials.gov study NCT02599350. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Effect of Bilateral vs. Unilateral Alveolar Recruitment on Gas Exchange in Lung Resection
ClinicalTrials.gov study NCT07044661. IPD Sharing: NO. Countries: 1. Publications: 0.
Distribution of Ventilation, Respiratory Drive and Gas Exchange: Measurements and Monitoring
ClinicalTrials.gov study NCT05462600. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Impact of CO2 Absorption on Gas Exchange and Ventilation Patterns While Breathing Into a Snow Air Pocket
ClinicalTrials.gov study NCT06895759. IPD Sharing: NO. Countries: 1. Publications: 0.
Effect of End-inspiratory Pause on Gas Exchange During Mediastinal Mass Excision With CO2 Insufflation and One-lung Ventilation
ClinicalTrials.gov study NCT06956079. IPD Sharing: NO. Countries: 1. Publications: 0.
Southern Ocean Gas Exchange Experiment (GasEx)
The GasEx experiments took place as several different cruises, e.g. GasEx I, GasEx II and GasEx III, also known as the Southern Ocean GasEx.
First ISCCP Regional Experiment (FIRE) Atlantic Stratocumulus Transition Experiment (ASTEX) Marine Aerosol Gas Exchange (MAGE) Tetroon
The First ISCCP Regional Experiments have been designed to improve data products and cloud/radiation parameterizations used in general circulation models (GCMs). Specifically, the goals of FIRE are (1) to improve the basic understanding of the interaction of physical processes in determining life cycles of cirrus and marine stratocumulus systems and the radiative properties of these clouds during their life cycles and (2) to investigate the interrelationships between the ISCCP data, GCM parameterizations, and higher space and time resolution cloud data. To-date, four intensive field-observation periods were planned and executed: a cirrus IFO (October 13 - November 2, 1986); a marine stratocumulus IFO off the southwestern coast of California (June 29 - July 20, 1987); a second cirrus IFO in southeastern Kansas (November 13 - December 7, 1991); and a second marine stratocumulus IFO in the eastern North Atlantic Ocean (June 1 - June 28, 1992). Each mission combined coordinated satellite, airborne, and surface observations with modeling studies to investigate the cloud properties and physical processes of the cloud systems.The ASTEX/MAGE experiment is a multinational effort to improve our capability for studying cloud-chemistry interactions and the air/sea fluxes that affect them. The primary purpose of ASTEX (with which MAGE collaborated) was to study the factors influencing the formation and dissipation of marine clouds. The specific goals of the MAGE atmospheric chemistry experiment in ASTEX included:- Develop and test a Lagrangian strategy for studying chemical and meteorological evolution in a tagged airmass, using ships, balloons, and aircraft.- Develop and test new techniques for estimating trace-gas and aerosol fluxes across the air/sea interface by comparison with traditional approaches.- Evaluate the impact of marine and continental aerosols on the formation and dissipation of stratocumulus clouds.- Compare the impacts of natural and anthropogenic sulphur, halogens, and hydrocarbons on marine aerosol chemistry.- Gain experience with multi-national and multi-agency field experiments as a means for addressing global tropospheric chemistry issues. The North Carolina State University tetroons were launched from the ship Oceanus in support of the FIRE-ASTEX observational program, conducted in the eastern North Atlantic during the month of June 1992. Special constant density balloons were launched and then tracked for 48 hours -- with the idea that they were tracking a single parcel of air. The parameter #sats gives the number of GPS satellites available for positioning. Four satellites are necessary to determine altitude, otherwise the last available altitude from four satellites is assumed to remain constant, so that the horizontal location can be triangulated from three satellites. An altitude is always given in the file, so care should be taken as to its use.Each tetroon attempted to fix its location once every 5 minutes of operation. Each tetroon was given an offset in transmission time during the 5 minute period in which to transmit its location in order to allow all tetroons to broadcast on the same frequency. The time at which a position fix was made and the relevant location information is provided for each tetroon. In the event no fix was possible due to the satellite constellation configuration, number or signal strength, no position was transmitted. Each position was retransmitted at 1/2 hour increments for seven hours to attempt to obtain the maximumamount of data, even for periods when aircraft were not in the area of transmission.
Circulating leukocyte transcriptional signatures in HIV patients with impaired gas exchange
GEO Series GSE76403. Homo sapiens. 39 samples. Type: Expression profiling by array.
129Xe Gas Exchange Imaging in IPF and cHP: A Reliability Study
ClinicalTrials.gov study NCT04677426. IPD Sharing: NO. Countries: 0. Publications: 0.
Impact of Draining Significant Effusion on Gas Exchange and Lung Mechanics in Patient Under Mechanical Ventilation
ClinicalTrials.gov study NCT03394872. IPD Sharing: NO. Countries: 0. Publications: 0.
The Effect of Inhaled Nitric Oxide on Pulmonary Gas-exchange in COPD
ClinicalTrials.gov study NCT04231760. IPD Sharing: NO. Countries: 0. Publications: 0.
Cardiac-dead mouse lungs may remain transplantable at 37ºC for 4 hours if gas exchange is preserved
GEO Series GSE154939. Mus musculus. 6 samples. Type: Expression profiling by high throughput sequencing.
A functional circuit formed by the autonomic nerves and myofibroblasts controls mammalian alveolar formation for gas exchange
GEO Series GSE189466. Mus musculus. 2 samples. Type: Expression profiling by high throughput sequencing.
Data set from Laforgia P, Bandera F, Alfonzetti E, Guazzi M. Exercise chronotropic incompetence phenotypes the level of cardiovascular risk and exercise gas exchange impairment in the general population. An analysis of the Euro-EX prevention trial. Eur J Prev Cardiol. 2020 Mar;27(5):526-535. doi: 10.1177/2047487319863506. Epub 2019 Jul 25. PMID: 31345056.
<p>Data set from Laforgia P, Bandera F, Alfonzetti E, Guazzi M. Exercise chronotropic incompetence phenotypes the level of cardiovascular risk and exercise gas exchange impairment in the general population. An analysis of the Euro-EX prevention trial. Eur J Prev Cardiol. 2020 Mar;27(5):526-535. doi: 10.1177/2047487319863506. Epub 2019 Jul 25. PMID: 31345056.</p> <p> </p> <p>This is the article:</p> <p><strong>Background: </strong> Chronotropic insufficiency (CI) is defined as the inability of the heart to increase its rate commensurate with increased demand. Exercise CI is an established predictor of major adverse cardiovascular events in patients with cardiovascular diseases.</p> <p><strong>Aim: </strong> The aim of this study was to evaluate how exercise CI phenotypes different levels of cardiovascular risk and how it may better perform in defining cardiovascular risk when analysed in the context of cardiopulmonary exercise test (CPET)-derived measures and standard echocardiography in a healthy population with variable cardiovascular risk profile.</p> <p><strong>Methods: </strong> Apparently healthy individuals (<em>N</em> = 702, 53.8% females) with at least one major cardiovascular risk factor (MCVRF; hypertension, diabetes, tabagism, dyslipidaemia, body mass index > 25), enrolled in the Euro-EX prevention trial, underwent CPET. CI was defined as the inability to reach 80% of the chronotropic index, that is, the ratio of peak heart rate - rest heart rate/peak heart rate - age predicted maximal heart rate (AMPHR: 220 - age), they were divided into four groups according to the heart rate reserve (<80%>) and respiratory gas exchange ratio (RER; < 1.05>) as a marker of achieved maximal performance. Subjects with a RER < 1.05 (<em>n</em> = 103) were excluded and the final population (<em>n</em> = 599) was divided into CI group (<em>n</em> = 472) and no-CI group (<em>n</em> = 177).</p> <p><strong>Results: </strong> Compared with no-CI, CI subjects were more frequently females with a history of hypertension in a high rate. CI subjects also exhibited a significantly lower peak oxygen uptake (VO<sub>2</sub>) and circulatory power and an echocardiographic pattern indicative of higher left atrial volume index and left ventricular mass index. An inverse stepwise relationship between heart rate reserve and number of MCVRFs was observed (one MCVRF: 0.71 ± 0.23; two MCVRFs: 0.68 ± 0.24, three MCVRFs: 0.64 ± 0.20; four MCVRFs: 0.64 ± 0.23; five MCVRFs: 0.57 ± 18; <em>p</em> < 0.01). In multivariate analysis the only variable found predicting CI was peak VO<sub>2</sub> (<em>p</em> < 0.05; odds ratio 0.91; confidence interval 0.85-0.97).</p> <p><strong>Conclusions: </strong> In a population of apparently healthy subjects, exercise CI is common and phenotypes the progressive level of cardiovascular risk by a tight relationship with MCVRFs. CI patients exhibit some peculiar abnormal exercise gas exchange patterns (lower peak VO<sub>2</sub> and exercise oscillatory ventilation) and echo-derived measures (higher left atrium size and left ventricle mass) that may well anticipate evolution toward heart failure.</p> <p> </p>
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.