Oxygen Stress Test
Oxygen Stress Test - Related Videos
09:08
Detecting Reactive Oxygen Species
0 Views •
2023
Reactive oxygen species are chemically active, oxygen-derived molecules capable of oxidizing other molecules. Because of their reactive nature, there are many deleterious effects associated with unchecked ROS production, including structural damage to DNA and other biological molecules. However, ROS can also be mediators of physiological signaling. There is accumulating evidence that ROS play significant roles in everything from activation of transcription factors to the mediation of...
03:28
Fluorescent Probe Imaging Assay: A Technique to Visualize Oxidative Stress in the Reactive Oxygen Species Inducer-Treated Cultured Intestinal Organoid Cells
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2025
This video describes the technique of visualizing oxidative stress in cultured organoids. This work helps in understanding the level of oxidative stress due to ROS accumulation in the various cell types present in an organoid after treatment with different ROS modulators.
08:58
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
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Cited by 28 •
2011
We present an experimental procedure for measuring the partial pressure of oxygen (pO2) in cerebral vasculature based on oxygen-dependent quenching of phosphorescence. Animal preparation and imaging procedures were outlined for both large field of view CCD-based imaging of pO2 in rats and 2-photon excitation based imaging of pO2 in mice.
09:38
Dissolved Oxygen in Surface Water
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Dissolved oxygen (DO) measurements calculate the amount of gaseous oxygen dissolved in surface water, which is important to all oxygen-breathing life in river ecosystems, including fish species preferred for human consumption (e.g. bluegill and bass), as well as decomposer species critical to the recycling of biogeochemical materials in the system. The oxygen dissolved in lakes, rivers, and oceans is crucial for the...
02:34
Impact of Oxygen-Glucose Deprivation and Reoxygenation on Cell-Cell Interactions
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2025
Source: Alluri, H., et.al. Oxygen-Glucose Deprivation and Reoxygenation as an In Vitro Ischemia-Reperfusion Injury Model for Studying Blood-Brain Barrier Dysfunction. J. Vis. Exp. (2015).The video demonstrates the impact of oxygen-glucose deprivation and subsequent reoxygenation on rat brain microvascular endothelial cells (RBMECs) by simulating hypoxic and nutrient-deprived conditions. These conditions result in ATP depletion, increased intracellular calcium, and the generation of reactive...
FAQs
The test changes either oxygen availability or physiological demand under controlled conditions, then tracks how the body responds. A reduced oxygen saturation, abnormal heart-rate or respiratory-rate response, electrocardiographic change, or altered arterial blood gas result can indicate difficulty maintaining oxygenation. Comparing these changes helps reveal limited cardiopulmonary reserve rather than relying on a single measurement.
Each measurement describes a different part of the response. Oxygen saturation reflects blood oxygenation, respiratory rate provides information about breathing effort or adaptation, and electrocardiography monitors cardiac electrical activity during the challenge. Heart rate adds another cardiovascular response measure. Together, these findings help clinicians distinguish patterns involving the lungs, heart, or oxygen transfer.
A change in oxygenation during altered oxygen availability or increased demand may point toward ventilation or perfusion abnormalities. Ventilation concerns movement of air through the lungs, while perfusion concerns blood flow available for oxygen exchange. The pattern of measured responses, including saturation and arterial blood gases when obtained, helps clinicians decide whether further evaluation is warranted.
Cardiopulmonary reserve is reflected by how effectively the heart and lungs accommodate a controlled challenge. If oxygenation, heart rate, breathing rate, or electrocardiographic findings become abnormal as demand rises, the response may show that reserve is limited. This information can add functional context to the evaluation of respiratory or cardiovascular disease and support diagnostic decisions.
Clinicians monitor oxygen saturation, heart rate, respiratory rate, and electrocardiography while administering a controlled oxygen concentration or increasing physiological demand. When the clinical assessment requires more direct information about blood oxygenation, they may also measure arterial blood gases. These observations are compared across the challenge to identify meaningful changes in cardiopulmonary function.
Arterial blood gases may be included when clinicians need additional information beyond noninvasive oxygen saturation. They provide measurements that help characterize blood oxygenation during the test and can clarify suspected hypoxemia or oxygenation abnormalities. Their use supports a more detailed interpretation when the monitored response does not fully explain the patient’s cardiopulmonary status.
Results can help clinicians determine whether a patient may benefit from supplemental oxygen or from additional specialized testing. They also contribute to evaluating respiratory and cardiovascular disease by showing how oxygenation and physiological responses change under challenge. The findings therefore support diagnostic decisions rather than serving only as an isolated measurement of oxygen saturation.