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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.

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...

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...

Cardiomyopathy VII: Pre and Post Operative Nursing Management

Cardiomyopathy VII: Pre and Post Operative Nursing Management

Patients with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction who remain symptomatic despite optimal medical therapy may undergo a septal myectomy (Morrow procedure). This procedure involves excising a portion of the hypertrophied septum below the aortic valve using a heart-lung machine to improve blood flow through the LVOT. Effective preoperative and postoperative nursing management ensures successful patient outcomes, minimizes complications, and...

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A Porcine Model of Acute Respiratory Failure with a Continuous Infusion of Oleic Acid

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Pulse Oximetry-A Perioperative Perspective.

Kellie Moon¹, Naema Daino², Paula Gomez¹

¹Medical College of Georgia, Augusta University, 1120 15th Street, Augusta, GA 30912, USA.

Diagnostics (Basel, Switzerland)

|June 26, 2026

Summary

Pulse oximetry is a vital tool for monitoring oxygen saturation and pulse rate during surgery. Understanding its principles and limitations improves patient safety and anesthetic care.

Keywords:

hemoglobin oxygen saturation monitoring perioperative monitoring and clinical applications photoplethysmography pleth variability index pulse oximetry interference pulse oximetry principles

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Published on: July 9, 2020

Area of Science:

Anesthesiology
Biomedical Engineering
Medical Monitoring

Background:

Pulse oximetry is a standard noninvasive monitor in anesthesia.
It enhances patient safety by detecting hypoxemia and deterioration.
Clinicians may lack full understanding of its technical principles and limitations.

Purpose of the Study:

To provide a perioperative perspective on pulse oximetry.
To discuss the physics, sensor technologies, and practical use of pulse oximetry.
To detail factors affecting measurement accuracy and explore advanced parameters.

Main Methods:

Review of pulse oximetry principles, including photoplethysmography.
Discussion of sensor technologies and probe placement.
Analysis of factors influencing accuracy and perioperative applications.

Main Results:

Identified sources of inaccuracy: motion artifact, low perfusion, dyshemoglobinemias, ambient light, skin pigmentation, venous pulsation.
Examined applications in preoperative, intraoperative, and postoperative phases.
Highlighted advanced parameters like perfusion index (PI) and pleth variability index (PVI).

Conclusions:

Comprehensive understanding of pulse oximetry is crucial for anesthesiologists.
Recognizing device limitations optimizes perioperative patient care.
Emerging innovations like AI-enhanced analysis promise further improvements.