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123 results for “Hyperoxia”
Dissolved oxygen and pH data collected in shallow riparian ponds from June - September 2013 for a study on hypoxia and hyperoxia.
Dissolved Oxygen and pH data collected using YSI sondes in shallow riparian ponds over three 72 hour periods in June, July, and September focused on patches of dominant vegetation within this pond. The differences in data represent the impact of these dominant vegetation patches on the oxygen dynamics and metabolism of the aquatic system. Data was collected either hourly or in five minute increments over the three study periods which were intended to capture spring (June), summer (July), and fall (September) conditions in the pond. The pond did experience successive states of pond vegetation over the seasons so some macrophytes are not represented in all seasons. Data also includes summary information taken from the primary oxygen data showing hours of hypoxia or hyperoxia or basicity in the various vegetation treatments.
Mechanisms of enhanced cardiorespiratory performance under hyperoxia differ with exposure duration in yellowtail kingfish
<p>Hyperoxia has been shown to expand the aerobic capacity of some fishes, although there have been very few studies examining the underlying mechanisms and how they vary across different exposure durations. Here, we investigated cardiorespiratory function of yellowtail kingfish (<em>Seriola lalandi</em>) acutely (~20 hours) and chronically (3-5 weeks) acclimated to hyperoxia (~200 % air saturation). Our results show that aerobic performance of kingfish is limited in normoxia and increases with environmental hyperoxia. Aerobic scope was elevated in both hyperoxia treatments driven by a ~33% increase in maximum O<sub>2</sub> uptake (MO<sub>2max</sub>), although the mechanisms differed across treatments. Fish acutely transferred to hyperoxia primarily elevated tissue O<sub>2</sub> extraction, while increased stroke volume-mediated maximum cardiac output was the main driving factor in chronically acclimated fish. Still an improved O<sub>2</sub> delivery to the heart in chronic hyperoxia was not the only explanatory factor as such. Here, maximum cardiac output only increased in chronic hyperoxia compared to normoxia when plastic ventricular growth occurred, as increased stroke volume was partly enabled by an ~8-12% larger relative ventricular mass. Our findings suggest that hyperoxia may be used long-term to boost cardiorespiratory function potentially rendering fish more resilient to metabolically challenging events and stages in their life-cycle.</p>
Normobaric Hyperoxia for Intracerebral Hemorrhage
ClinicalTrials.gov study NCT04144868. IPD Sharing: NO. Countries: 1. Publications: 11.
Intermittent Hypoxia-Hyperoxia Combined With Physical Therapy for Knee Osteoarthritis
ClinicalTrials.gov study NCT06965946. IPD Sharing: YES. Countries: 1. Publications: 7.
Mechanisms of enhanced cardiorespiratory performance under hyperoxia differ with exposure duration in yellowtail kingfish
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Data from: Late Paleozoic fusulinoidean gigantism driven by atmospheric hyperoxia
Atmospheric hyperoxia, with pO2 in excess of 30%, has long been hypothesized to account for late Paleozoic (360-250 million years ago) gigantism in numerous higher taxa. However, this hypothesis has not been evaluated statistically because comprehensive size data have not been compiled previously at sufficient temporal resolution to permit quantitative analysis. In this study, we test the hyperoxia-gigantism hypothesis by examining the fossil record of fusulinoidean foraminifers, a dramatic example of protistan gigantism with some individuals exceeding 10 cm in length and exceeding their relatives by six orders of magnitude in biovolume. We assembled and examined comprehensive regional and global, species-level datasets containing 270 and 1823 species, respectively. A statistical model of size evolution forced by atmospheric pO2 is conclusively favored over alternative models based on random walks or a constant tendency toward size increase. Moreover, the ratios of volume to surface area in the largest fusulinoideans are consistent in magnitude and trend with a mathematical model based on oxygen transport limitation. We further validate the hyperoxia-gigantism model through an examination of modern foraminiferal species living along a measured gradient in oxygen concentration. These findings provide the first quantitative confirmation of a direct connection between Paleozoic gigantism and atmospheric hyperoxia.
Effect of Systemic Hypoxia and Hyperoxia on Retinal Oxygen Saturation
ClinicalTrials.gov study NCT01692821. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Normobaric Hyperoxia Combined With Reperfusion for Acute Ischemic Stroke
ClinicalTrials.gov study NCT03620370. IPD Sharing: Not stated. Countries: 1. Publications: 2.
GLP-1 and Hyperoxia for Organ Protection in Heart Surgery
ClinicalTrials.gov study NCT02673931. IPD Sharing: NO. Countries: 1. Publications: 3.
Retrospective Multicentre Observational Study on the Incidence of Hyperoxia in Non-intubated Patients in Intensive Care in Belgium Study OxSIZgen
ClinicalTrials.gov study NCT04291911. IPD Sharing: NO. Countries: 1. Publications: 13.
The Effect of Breathing Helium-Hyperoxia During Pulmonary Rehabilitation in Patients With COPD
ClinicalTrials.gov study NCT00406705. IPD Sharing: Not stated. Countries: 1. Publications: 2.
Hyperoxia and Hypertonic Saline in Septic Shock
ClinicalTrials.gov study NCT01722422. IPD Sharing: Not stated. Countries: 1. Publications: 7.
ORI to Reduce Hyperoxia After Out Hospital Cardiac Arrest
ClinicalTrials.gov study NCT03653325. IPD Sharing: YES. Countries: 1. Publications: 1.
Impact of Perioperative Hyperoxia on Cancer Recurrence and Mortality After Elective Colorectal Cancer Surgery
ClinicalTrials.gov study NCT06989346. IPD Sharing: UNDECIDED. Countries: 1. Publications: 3.
Treatment Duration on Normobaric Hyperoxia in Acute Ischemic Stroke
ClinicalTrials.gov study NCT05404373. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Measurement of Retinal Blood Flow, Retinal Oxygenation and Retinal Oxygen Extraction in Healthy Subjects During Normoxia and Systemic Hyperoxia
ClinicalTrials.gov study NCT00914407. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Intermittent Hypoxia-hyperoxia Therapy in Obese Patients (IHHTOP)
ClinicalTrials.gov study NCT06451601. IPD Sharing: YES. Countries: 1. Publications: 28.
Normobaric Hyperoxia Combined With Endovascular Treatment for Acute Ischemic Stroke
ClinicalTrials.gov study NCT05128422. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Impact of Hyperoxia During Cardiopulmonary
ClinicalTrials.gov study NCT02819739. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Normal Oxygenation Versus Hyperoxia in the Intensive Care Unit (ICU)
ClinicalTrials.gov study NCT01319643. IPD Sharing: Not stated. Countries: 1. Publications: 1.
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