PubMed Journals Articles About "Oxygen" RSS

06:04 EDT 23rd September 2018 | BioPortfolio

Oxygen PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Oxygen articles that have been published worldwide.

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Showing "Oxygen" PubMed Articles 1–25 of 4,000+

Oxygen Reserve Index: Validation of a New Variable.

Pulse oximetry-derived oxygen saturation is typically >97% in normoxia and hyperoxia, limiting its clinical use. The new Oxygen Reserve Index (ORi), a relative indicator of the partial pressure of oxygen dissolved in arterial blood (PaO2) in the range of 100-200 mm Hg, may allow additional monitoring of oxygen status.

Use of Oxygen at the End of Life: Attitudes, Beliefs, and Practices in Wisconsin.

Oxygen therapy for the management of breathlessness remains controversial and little information is available regarding the practice of using oxygen at end of life. Oxygen use in end-of-life care is increasingly being questioned, while the use of oxygen for routine "comfort care" at end of life continues.

Topical oxygen therapy stimulates healing in difficult, chronic wounds: a tertiary centre experience.

Oxygen plays a central role in wound healing. Recent technological advances have miniaturised oxygen delivery systems, with novel topical oxygen therapy allowing patients to receive oxygen therapy 24 hours a day while remaining completely mobile. Here we aim to examine the efficacy and safety of continuous topical oxygen diffusion in a 'real-world' setting.

Determining the venous oxygen reservoir: A novel, hypothetical approach to titration of supplemental oxygen in preterm newborns.

While normal oxygen saturation is commonly thought to be a marker of normal oxygenation, cutaneous saturation does not account for the sufficiency of oxygen within each cell or that of the system overall. Rather, cutaneous oximetry simply defines the saturation of haemoglobin (Hb) with oxygen in a pulsatile vessel. Assessment of sufficiency is best determined by measurement of the amount of oxygen left over following aerobic respiration. This left over oxygen is 'stored' on Hb in the venous compartment and ...

Oxygen management in mechanically ventilated patients: A multicenter prospective observational study.

To observe arterial oxygen in relation to fraction of inspired oxygen (FO) during mechanical ventilation (MV).

Performing under pressure: hypertension and the regulation of cerebral oxygen delivery.

Reductions in arterial oxygen content (CaO) elicit increases in cerebral blood flow (CBF) that are adequate to maintain convective delivery of oxygen to the brain in healthy humans (i.e. cerebral oxygen delivery, CDO). This article is protected by copyright. All rights reserved.

The Role of Oxygen Therapy in Normoxemic Acute Coronary Syndrome: A Systematic Review of Randomized Controlled Trials.

Supplemental oxygen has been commonly used in the cases of acute coronary syndrome (ACS); however, recent evidence suggests that high-concentration oxygen supplementation and hyperbaric oxygen in ACS patients are associated with adverse cardiovascular effects.

Pulse Oximetry and Arterial Oxygen Saturation during Cardiopulmonary Exercise Testing.

Peripheral capillary oxygen saturation (SpO2) is used as surrogate for arterial blood oxygen saturation. We studied the degree of discrepancy between SpO2 and arterial oxygen (SaO2) and identified parameters that may explain this difference.

A simplified silver phosphate extraction method for oxygen isotope analysis of bioapatite.

Although phosphatic materials are chemically complex and are prone to exchange oxygen isotopes with their environments, the phosphate (PO ) component of these materials is robust and retains its original oxygen isotopic composition. As a result, there are currently several methods for the isolation of phosphate oxygen through the precipitation of silver phosphate (Ag PO ). However, some of these techniques produce Ag PO of questionable purity, while nearly all are lengthy and/or require relatively large sam...

Oxygen plasmas: a sharp chisel and handy trowel for nanofabrication.

Although extremely chemically reactive, oxygen plasmas feature certain properties that make them attractive not only for material removal via etching and sputtering, but also for driving and sustaining nucleation and growth of various nanostructures in plasma bulk and on plasma-exposed surfaces. In this minireview, a number of representative examples is used to demonstrate key mechanisms and unique capabilities of oxygen plasmas and how these can be used in present-day nano-fabrication. In addition to modif...

Current Ventilator and Oxygen Management during General Anesthesia: A Multicenter, Cross-sectional Observational Study.

Intraoperative oxygen management is poorly understood. It was hypothesized that potentially preventable hyperoxemia and substantial oxygen exposure would be common during general anesthesia.

The Effects of Different Levels of Ambient Oxygen in an Oxygen-Enriched Surgical Environment and Production of Surgical Fires.

Surgical fires require an oxygen-enriched environment, a flammable substrate, and an ignition source. We hypothesized ambient oxygen concentration is proportional to the latency time to combustion and the incidence of surgical fires that are detected. We examined latency time and number of events, utilizing the VanCleave et al model of intraoral fire ignition under 60, 80, and 100% oxygen concentration and flow rates of 4 and 10 L/min. Results demonstrated that ambient oxygen concentration and flow rate cor...

Oxygen titration after resuscitation from out-of-hospital cardiac arrest: a multi-centre, randomised controlled pilot study (the EXACT pilot trial).

Recent studies suggest the administration of 100% oxygen to hyperoxic levels following return-of-spontaneous-circulation (ROSC) post-cardiac arrest may be harmful. However, the feasibility and safety of oxygen titration in the prehospital setting is unknown. We conducted a multi-centre, phase-2 study testing whether prehospital titration of oxygen results in an equivalent number of patients arriving at hospital with oxygen saturations SpO2 ≥ 94%.

From Oxiranes to Oligomers: Architectures of US FDA Approved Pharmaceuticals Containing Oxygen Heterocycles.

Oxygen heterocycles are the second most common type of heterocycles that appear as structural components of US Food and Drug Administration (FDA) approved pharmaceuticals. Analysis of our database of drugs approved through 2017, reveals 311 distinct pharmaceuticals containing at least one oxygen heterocycle. Most prevalent among these are pyranoses, with furanoses, macrolactones, morpholines, and dioxolanes rounding out the top five. The main body of this perspective is organized according to ring-size, com...

Fundamental understanding of distracted oxygen delignification efficiency by dissolved lignin during biorefinery process of eucalyptus.

In this work, a fundamental understanding of oxygen delignification distracted by dissolved lignin was investigated. In the new biorefinery model of shortening kraft pulping integrated with extended oxygen delignification process, increasing content of residual lignin in the original pulp could result in enhanced delignification efficiency, higher pulp viscosity and less carbonyl groups. However, the invalid oxygen consumption by dissolved lignin could be increased with the increase of process temperature a...

Superconductivity in Anti-ThCrSi-type ErOBi Induced by Incorporation of Excess Oxygen with CaO Oxidant.

Recently, superconductivity was induced by expanding interlayer distance between Bi square nets in anti-ThCrSi-type YOBi through incorporation of excess oxygen with increased nominal amount of oxygen. However, such oxygen incorporation was applicable to only YOBi among ROBi ( R = rare earth metal), probably due to a larger amount of oxygen incorporation for YOBi. In this study, the interlayer distance in ErOBi was increased by cosintering with CaO, which served as an oxidant, indicating that excess oxygen ...

Singlet Oxygen Production By a Crude Oil From the San Jorge Gulf Basin, Argentina.

The quantum yields for singlet oxygen production by diluted solutions of an Argentine crude oil and its SARA (saturates, aromatics, resins and asphaltenes) fractions were obtained by direct detection of the characteristic phosphorescence following monochromatic excitation at 355 nm. The most efficient sensitizers of singlet oxygen in organic media are crude oil, maltenes and aromatics fractions (values of singlet oxygen quantum yield are around 0.7), and resins (values around 0.1) are the poorest. Also, the...

Fabrication and high ORR performance of MnO nanopyramid layers with enriched oxygen vacancies.

Manganese oxide nanopyramids (MONPMs) with enriched oxygen vacancies (OVs) are vertically grown on nitrogen doped carbon (NC) microlaminate arrays with narrow spacing, yielding a high performance for the oxygen reduction reaction (ORR).

In Patients With Acute Myocardial Infarction and No Hypoxemia, Does Oxygen Therapy Improve Outcomes Compared With No Supplemental Oxygen?

Oxygen vacancies modulated Bi-rich bismuth oxyiodide microspheres with tunable valence band position to boost the photocatalytic activity.

How to optimize the photogenerated electron-hole pairs' separation efficiency and redox performance of defective photocatalysts is still a concern for photocatalysis research. In this study, rich oxygen vacancy was introduced in BiOI microsphere (BiOI-OVR) via a facile ionic liquid assisted solvothemal method to investigate the charge separation and photocatalytic performance. To demonstrate the dominant role of the introduced oxygen vacancy, partial oxygen vacancy in BiOI microsphere was repaired by post-c...

The nasal oxygen practice in intensive care units in China: A multi-centered survey.

Nurses frequently administer nasal oxygen therapy for patients in intensive care units (ICUs). However, little is known about the current status, nurses' management and perception on the nasal oxygen therapy in China. Therefore, we aimed to investigate the nasal oxygen practice of ICUs in China to provide insights into future direction.

A chemiresistor sensor based on a cobalt(salen) metallopolymer for dissolved molecular oxygen.

A resistance detection device for dissolved molecular oxygen in aqueous solutions is prepared using a chemiresistor material as sensor platform. The chemiresistive circuit element is fashioned from a thin film of a cobalt-salen metallopolymer electrodeposited on a platinum electrode. Electrochemical impedance spectroscopy shows that the resistive and capacitive properties of the sensor platform depend on the presence of dissolved oxygen. The electrical circuit models are R(Q/R)(Q/R) and R(Q/R)(Q/RW) in the ...

Temporal dissociation between muscle and pulmonary oxygen uptake kinetics: influences of perfusion dynamics and arteriovenous oxygen concentration differences in muscles and lungs.

The aim of the study was to test whether or not the arteriovenous oxygen concentration difference (avDO) kinetics at the pulmonary (avDOpulm) and muscle (avDOmusc) levels is significantly different during dynamic exercise.

In Situ Observation of Resistive Switching in an Asymmetric Graphene Oxide Bilayer Structure.

Graphene oxide decorated with oxygen functional groups is a promising candidate as an active layer in resistive switching devices due to its controllable physical-chemical properties, high flexibility, and transparency. However, the origin of conductive channels and their growth dynamics remain a major challenge. We use in situ transmission electron microscopy techniques to demonstrate that nanoscale graphene oxide sheets bonded with oxygen dynamically change their physical and chemical structures upon an a...

Oxygen therapy in adult patients. Part 2: promoting safe and effective practice in patients' care and management.

The assessment, care and management of patients requiring oxygen therapy are key aspects of a nurse's role. Although oxygen therapy is an important treatment for many clinical conditions, it carries risks and complications; therefore, nurses and other health professionals have a responsibility to ensure safe and effective practice along with maintaining and developing their knowledge and skills in this therapy. The relevant aspects of physiology and pathophysiology were explored and discussed in part one of...

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