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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
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Guidelines For Measuring Vital Signs01:19

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Following these guidelines can help nurses accurately measure vital signs, assess changes in patient conditions, and provide timely treatment when necessary. Adhering closely to the guidelines ensures the accuracy and reliability of the results.
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Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
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Oxygen Delivering System I: Nasal Cannula and Face Mask01:26

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The human body requires oxygen to function, and when the natural process of respiration is hindered, external devices, including the following, are needed to help deliver this vital gas.
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Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen01:16

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Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
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Related Experiment Video

Updated: Jan 10, 2026

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care

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OxyTrack: A Novel Needle Sensor for In Situ Oximetry.

Ryan C O'Connell1, Maciej M Kmiec1, Sergey V Petryakov1

  • 1Department of Radiology, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA.

Magnetic Resonance in Medicine
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

The novel OxyTrack device enables deep-tissue oxygen monitoring using electron paramagnetic resonance (EPR) oximetry. This advancement offers improved accuracy and stability for in vivo oxygen measurements in various tissues.

Keywords:
EPREPR instrumentationESR spectroscopyEppendorf needle electrodeoximetryresonator designtumor hypoxia

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Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Analytical Chemistry

Background:

  • In vivo electron paramagnetic resonance (EPR) oximetry is crucial for tissue oxygen measurements.
  • Existing implantable probes like OxyChip have limitations in depth sensitivity for deep tissues.
  • There is a need for advanced sensors capable of accurate deep-tissue oxygen monitoring.

Purpose of the Study:

  • To develop a novel sensor, OxyTrack, for deep-tissue oximetry.
  • To overcome the depth sensitivity limitations of existing EPR oximetry resonators.
  • To enable accurate in situ monitoring of oxygen levels in deeper biological tissues.

Main Methods:

  • Designed and fabricated OxyTrack sensors with coax-tip micro-loop resonators and OxyChip.
  • Utilized various needle sizes (0.5-1 mm OD, 3-17 cm length) for sensor embedding.
  • Tested sensor performance using an L-band continuous wave EPR spectrometer.

Main Results:

  • OxyTrack demonstrated a high signal-to-noise ratio (SNR) even at low radiofrequency (RF) powers.
  • Sensor orientation and insertion depth had no significant impact on oxygen measurements.
  • The device showed rapid response to oxygen changes, stability to sterilization, and compatibility with medical imaging.

Conclusions:

  • OxyTrack technology significantly advances EPR oximetry for deep-tissue oxygen monitoring.
  • The novel sensor enables reliable in situ measurement of oxygenation in challenging anatomical locations.
  • This development holds promise for improved diagnostics and research in conditions involving altered tissue oxygen levels.