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Pulse Oximetry

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 Signs

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 saturation

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 Perfusion

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...

Respiratory Assessment: Purpose and Indications

Respiratory Assessment: Purpose and Indications

Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...

Measurement of Blood Pressure

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.

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Related Experiment Video

Updated: Jul 10, 2026

A Model to Simulate Clinically Relevant Hypoxia in Humans

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Pulse oximetry: basic principles and applications in aerospace medicine.

Jessica L Wagner¹, Keith J Ruskin

¹Yale University School of Medicine, 333 Cedar Street, TMP3, New Haven, CT 06520, USA.

Aviation, Space, and Environmental Medicine

|October 25, 2007

Summary

New pulse oximeters offer improved performance in challenging environments for aerospace medicine. These advanced devices provide reliable monitoring of oxyhemoglobin saturation (Spo2) and other vital signs, even during flight.

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Area of Science:

Aerospace Medicine
Biomedical Engineering
Physiological Monitoring

Background:

Pulse oximeters are essential noninvasive tools in aerospace medicine.
Advancements allow for reliable monitoring in adverse conditions and measurement of additional parameters.
Small, portable devices facilitate in-flight oxyhemoglobin saturation monitoring.

Purpose of the Study:

To explain the theory of operation and limitations of pulse oximetry.
To provide an update on emerging pulse oximetry technologies.
To discuss the applications of pulse oximetry in aerospace medicine.

Main Methods:

Spectrophotometry is used to determine the ratio of oxyhemoglobin to reduced hemoglobin.
Plethysmographic waveform analysis aids in assessing perfusion and blood volume.
New probe designs and contactless sensors are being introduced.

Main Results:

Accurate Spo2 measurement depends on signal quality, with limitations from calibration, motion, and dyshemoglobinemias.
Vasoconstriction and probe/clothing interference can impair readings.
Novel devices offer enhanced freedom of movement and additional measurement capabilities.

Conclusions:

Despite limitations, pulse oximetry is a valuable tool in aerospace.
New technologies are addressing previous constraints, expanding applications.
Continued innovation enhances the utility of pulse oximetry for aviators and astronauts.