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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...

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.

Sites for measuring blood pressure

Sites for measuring blood pressure

Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
The Brachial Artery: Primary Site for Blood Pressure Measurement

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.

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.

Assessing Blood pressure using a doppler ultrasound

Assessing Blood pressure using a doppler ultrasound

To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:

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Related Experiment Video

Updated: Jun 4, 2026

The Intra-Aortic Balloon Pump

The Intra-Aortic Balloon Pump

Published on: February 5, 2021

Pulse oximetry during intraaortic balloon pump application.

N Zoremba¹, C Brülls, V Thiel

¹Department of Anaesthesiology, University Hospital RWTH Aachen, Aachen, Germany. nzoremba@ukaachen.de

Acta Anaesthesiologica Scandinavica

|February 4, 2011

Summary

This summary is machine-generated.

The Masimo Radical 7 pulse oximeter accurately measures oxygen saturation in patients with intraaortic balloon pump (IABP) support at 1:2 and 1:3 ratios. This new-generation device offers superior reliability compared to other tested models.

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Last Updated: Jun 4, 2026

The Intra-Aortic Balloon Pump

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Standardized Hemorrhagic Shock Induction Guided by Cerebral Oximetry and Extended Hemodynamic Monitoring in Pigs

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Published on: May 21, 2019

Area of Science:

Anesthesiology and Intensive Care Medicine
Biomedical Engineering
Cardiovascular Monitoring

Background:

Pulse oximeters are essential for monitoring patients in critical care settings.
Reliable oxygen saturation (SpO2) readings are crucial, especially during conditions like intraaortic balloon pump (IABP) therapy.
Signal interference from light, motion, and reduced perfusion can impact oximeter accuracy.

Purpose of the Study:

To evaluate the reliability of new-generation pulse oximeters during intraaortic balloon pump (IABP) therapy.
To compare the accuracy of Masimo Radical 7, Nellcor N-600, and Datex Ohmeda TruSat pulse oximeters against arterial blood gas analysis (BGA-SaO2).

Main Methods:

Experimental study involving patients undergoing IABP treatment.
Comparison of pulse oximetry values (SpO2) with arterial blood gas analysis (BGA-SaO2) data.
Evaluation at different IABP support ratios: 1:1, 1:2, and 1:3.

Main Results:

Masimo Radical 7 showed minimal bias (0.19% to -0.01%) at 1:2 and 1:3 IABP support ratios compared to BGA-SaO2.
Nellcor N-600 demonstrated low bias (0.59% to 0.85%) across all support ratios.
Datex Ohmeda TruSat exhibited higher bias (1.41% to 3.38%) across all support ratios.

Conclusions:

Masimo Radical 7 provides accurate SpO2 measurements in patients with IABP support at 1:2 and 1:3 ratios.
Masimo Radical 7 is more reliable than Nellcor N-600 at 1:2 and 1:3 IABP support ratios.
Datex Ohmeda TruSat showed significant discrepancies with BGA-SaO2 across all tested IABP support ratios.