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Related Concept Videos

Pulse Oximetry01:24

Pulse Oximetry

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.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important. 
Guidelines For Measuring Vital Signs01:19

Guidelines For Measuring Vital Signs

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.
Before taking a patient's vital signs, a nurse would consider and assess the patient's comfort level and ensure appropriate equipment is available.
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...

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Related Experiment Video

Updated: May 8, 2026

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
14:28

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

Published on: May 10, 2024

Retinal oxygen saturation: novel analysis method for the oxymap.

Joseph P Paul1, Rachael A O'Connell, Sarah L Hosking

  • 1*BOptom †BSc (Hons) ‡PhD Department of Optometry and Vision Sciences (JPP, RAO, SLH, AJA, BVB), The University of Melbourne; and Australian College of Optometry (SLH), Melbourne, Victoria, Australia; and Department of Optometry (SLH), City University, London, United Kingdom.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 3, 2013
PubMed
Summary

Retinal vessel oxygen saturation varies by vessel size and location. Smaller veins show higher oxygen saturation, and saturation is lower near the optic nerve and in the lower retinal hemisphere.

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A Model to Simulate Clinically Relevant Hypoxia in Humans
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A Model to Simulate Clinically Relevant Hypoxia in Humans

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A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Physiology

Background:

  • Retinal oximetry is crucial for understanding ocular blood flow.
  • Novel image analysis techniques can provide detailed insights into retinal oxygenation.

Purpose of the Study:

  • To investigate how retinal oxygen saturation changes with vessel width.
  • To analyze oxygen saturation gradients relative to the optic nerve and between retinal hemifields.

Main Methods:

  • Acquired 10 retinal images from 17 participants using the Oxymap T1 retinal oximeter.
  • Employed a novel image analysis approach to extract pixel data and generate frequency histograms of oxygen saturation.
  • Utilized Gaussian models to determine arteriole and venule oxygen saturation across various vessel diameters (70-170 μm).

Main Results:

  • Venous oxygen saturation increased with decreasing vessel diameter.
  • Arterial oxygen saturation remained consistent across different vessel widths.
  • Oxygen saturation was lower in veins closer to the optic nerve.
  • The superior retinal hemisphere exhibited higher venous oxygen saturation than the inferior hemifield.

Conclusions:

  • The developed objective analysis method offers a comprehensive assessment of retinal oxygen saturation.
  • This approach provides detailed information on oxygen saturation patterns at the posterior pole based on vessel width and location.