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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...
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.
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. 
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...
Special considerations while measuring pulse01:13

Special considerations while measuring pulse

Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:

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Related Experiment Video

Updated: Jul 9, 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

Multiwavelength pulse oximetry: theory for the future.

Takuo Aoyagi1, Masayoshi Fuse, Naoki Kobayashi

  • 1From the *Ogino Memorial Research Laboratory, Nihon Kohden Corporation; †Department of Respirology, National Tokyo Hospital, Tokyo; and ‡Nagano Children's Hospital, Nagano, Japan.

Anesthesia and Analgesia
|December 6, 2007
PubMed
Summary

A new physical theory for multiwavelength pulse oximetry enhances accuracy and reduces artifacts. This advancement improves pulse oximetry performance, addressing challenges like motion and low pulse amplitude for wider applications.

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Area of Science:

  • Biomedical optics
  • Physiological monitoring

Background:

  • Increasing use of pulse oximeters necessitates improved performance and broader applicability.
  • Developing multiwavelength oximetry requires a robust physical theory.
  • Quantifying optical absorption in scattering media like tissue is a significant challenge.

Observation:

  • Schuster's theory of radiation through a foggy atmosphere was adapted as the basis for pulse oximetry theory.
  • Key factors considered include optics, tissue properties, and venous blood characteristics.
  • A physical theoretical formula for pulse oximetry was derived and experimentally validated.

Findings:

  • The derived theory confirmed a full oxygen saturation (SO2) range.
  • A three-wavelength method effectively eliminated tissue effects, enhancing SpO2 accuracy.
  • A five-wavelength method mitigated venous blood interference and improved motion artifact reduction.

Implications:

  • The multiwavelength pulse oximetry theory offers solutions for accuracy, motion artifacts, low pulse amplitude, and response delays.
  • This theoretical framework is expected to expand the applications of pulse oximetry.
  • The work represents a significant advancement in quantifying optical density within scattering biological tissues.