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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...
Oxygen Delivering System I: Nasal Cannula and Face Mask01:26

Oxygen Delivering System I: Nasal Cannula and Face Mask

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.
Nasal Cannula
A nasal cannula is a lightweight tube split at one end into two prongs and placed in the nostrils. It is typically used to deliver low to medium levels of oxygen.
Suggested flow rate: The suggested flow rate for a nasal cannula typically ranges between 1 and 6 L/min.
Oxygen percentage setting:...
Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen01:16

Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen

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.
Venturi Mask
The Venturi mask, named after the Venturi effect, is designed to deliver precise oxygen concentrations. It consists of a large tube with an oxygen inlet that narrows down, causing a pressure drop that pulls air in through adjustable side ports. The mask is a lightweight,...
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. 
Administering Oxygen by Mask01:30

Administering Oxygen by Mask

Administering Oxygen by Mask
Administering oxygen by mask is a common nursing intervention that provides supplemental oxygen to patients with respiratory distress or chronic lung conditions. This procedure involves delivering oxygen at a specified rate through a face mask connected to an oxygen source.
Equipment
The equipment necessary for this procedure includes:

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Related Experiment Video

Updated: Jul 13, 2026

Use of an Integrated Low-Flow Anesthetic Vaporizer, Ventilator, and Physiological Monitoring System for Rodents
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Use of an Integrated Low-Flow Anesthetic Vaporizer, Ventilator, and Physiological Monitoring System for Rodents

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Deceptive simplicity: systemic oxygen delivery and pulse oximetry.

Clare L Collins1, Chad C Andersen

  • 1Mercy Hospital For Women, Melbourne, Victoria, Australia. ccollins@mercy.com.au

Journal of Paediatrics and Child Health
|July 20, 2007
PubMed
Summary

Pulse oximetry measures oxygen saturation, not overall oxygen delivery. Factors like cardiac output and hemoglobin levels significantly impact oxygen delivery independently of saturation, especially in newborns.

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Area of Science:

  • Neonatal physiology
  • Cardiovascular system
  • Respiratory system

Background:

  • Pulse oximetry is commonly used to assess oxygenation in newborns.
  • It is often misinterpreted as a direct measure of systemic oxygen delivery.

Purpose of the Study:

  • To clarify the physiological determinants of systemic oxygen delivery.
  • To explain the limitations of pulse oximetry in neonatal care.
  • To caution against over-reliance on pulse oximetry readings.

Main Methods:

  • Review of physiological principles governing oxygen transport.
  • Analysis of the relationship between cardiac output, hemoglobin, and oxygen saturation.
  • Discussion of clinical implications for neonatal monitoring.

Main Results:

  • Pulse oximetry measures only the percentage of hemoglobin saturated with oxygen (SpO2).
  • Systemic oxygen delivery depends on cardiac output, hemoglobin concentration, and SpO2.
  • Changes in cardiac output or hemoglobin can alter oxygen delivery without affecting SpO2.

Conclusions:

  • Pulse oximetry provides an incomplete picture of oxygen delivery.
  • Over-interpretation of SpO2 can lead to inappropriate clinical decisions in neonates.
  • A comprehensive understanding of oxygen transport physiology is crucial for neonatal care.