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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

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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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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.
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Related Experiment Video

Updated: Apr 6, 2026

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Pulseless Oximetry: A Preliminary Evaluation.

Thomas K Aldrich1, Pragya Gupta1, Sean P Stoy1

  • 1Pulmonary Medicine Division, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, NY.

Chest
|July 24, 2015
PubMed
Summary
This summary is machine-generated.

A new noninvasive method accurately measures arterial oxygen saturation in patients with left ventricular assist devices (LVADs) lacking pulse. This technique provides a valuable alternative to painful arterial blood gas sampling for assessing oxygenation in these challenging patients.

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Medical Diagnostics

Background:

  • Standard pulse oximetry is unreliable in patients with weak or absent arterial pulsations.
  • Continuous flow left ventricular assist devices (LVADs) commonly result in pulselessness, rendering conventional pulse oximetry ineffective.
  • Accurate, noninvasive monitoring of arterial oxygenation is critical for managing patients with LVADs.

Purpose of the Study:

  • To develop and validate a novel noninvasive method for measuring arterial oxygen saturation (Sao2) in pulseless patients with LVADs.
  • To establish the accuracy of this new technique compared to standard methods.
  • To provide a less invasive alternative to arterial blood gas analysis for oxygenation assessment.

Main Methods:

  • Developed a technique involving temporary radial and ulnar artery occlusion.
  • Utilized red (660 nm) and infrared (905 nm) light transillumination of the fingertip.
  • Calculated the red/infrared arterial blood attenuance ratio (R/IR) post-occlusion release.
  • Calibrated the R/IR ratio against standard pulse oximetry in healthy subjects.
  • Validated the method in seven pulseless patients with LVADs.

Main Results:

  • A strong correlation was observed between the R/IR ratio and oxygen saturation by pulse oximetry (Spo2) in normal subjects (R² = 0.975).
  • In LVAD patients, the developed method showed a clinically insignificant underestimation of Sao2 by 1.1 ± 1.6 percentage points compared to arterial blood measurements.
  • The maximum deviation in LVAD patients was 3.4 percentage points, indicating acceptable accuracy.

Conclusions:

  • Preliminary findings suggest that this pulseless oximetry technique can accurately estimate arterial oxygen saturation in patients with LVADs.
  • This noninvasive method offers a significant advancement for assessing oxygenation in pulseless individuals.
  • It provides a valuable, less invasive alternative to arterial puncture for continuous oxygenation monitoring in LVAD patients.