SpO2 Measurement Depending on Different Pulse Oximeter Averaging Time Settings

Not Applicable

Completed

• Conditions: Reduced Perfusion During SpO2 Measurements; Movement Artifacts During SpO2 Measurements
• Interventions: Other: Movement artifact - knocking; Other: Movement artifact - tremor; Other: Artifact - ambient light; Other: Artifact - low perfusion; Other: SpO2 measurement

• Registration Number: NCT04933773
• Lead Sponsor: Czech Technical University in Prague

Brief Summary

The aim of this study is to characterize the noise in the SpO2 signal depending on different pulse oximeter averaging time settings.

Detailed Description

Noise in the SpO2 signal is most often caused by artifacts, such as movement artifacts, reduced perfusion, additional light and others. These artifacts can be partially removed from the SpO2 signal by different pulse oximeter settings, specifically the sensitivity mode and averaging time. It is known that when a longer averaging time is set, the measured signal contains fewer artifacts, on the other hand there is an increased risk of missing short desaturation. The aim of this work is to characterize the noise in the SpO2 signal depending on the set averaging time of the pulse oximeter based on experimental data from healthy volunteers.

Study Timeline

• Study Start: 2021-05-15
• Study First Submitted: 2021-06-14
• Study First Submitted QC: 2021-06-14
• Study First Posted: 2021-06-22
• Primary Completion: 2021-10-15
• Study Completion: 2021-10-15
• Status Verified: 2022-01
• Last Update Submitted: 2022-01-27
• Last Update Posted: 2022-01-28

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 17

Inclusion Criteria

• healthy volunteers from the Czech Technical University

Exclusion Criteria

• pregnancy
• severe cardiovascular conditions
• injury to the upper limbs or hands that could affect the peripheral perfusion
• diabetes
• hypotension or hypertension

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Set averaging times: 2-4 seconds and 8 seconds	Artifact - ambient light	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 2-4 seconds, the second pulse oximeter is set to an averaging time of 8 seconds.
Set averaging times: 8 seconds and 16 seconds	Movement artifact - tremor	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 8 seconds, the second pulse oximeter is set to an averaging time of 16 seconds.
Set averaging times: 8 seconds and 16 seconds	SpO2 measurement	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 8 seconds, the second pulse oximeter is set to an averaging time of 16 seconds.
Set averaging times: 2-4 seconds and 8 seconds	SpO2 measurement	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 2-4 seconds, the second pulse oximeter is set to an averaging time of 8 seconds.
Set averaging times: 2-4 seconds and 8 seconds	Movement artifact - tremor	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 2-4 seconds, the second pulse oximeter is set to an averaging time of 8 seconds.
Set averaging times: 8 seconds and 16 seconds	Artifact - low perfusion	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 8 seconds, the second pulse oximeter is set to an averaging time of 16 seconds.
Set averaging times: 2-4 seconds and 8 seconds	Movement artifact - knocking	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 2-4 seconds, the second pulse oximeter is set to an averaging time of 8 seconds.
Set averaging times: 2-4 seconds and 8 seconds	Artifact - low perfusion	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 2-4 seconds, the second pulse oximeter is set to an averaging time of 8 seconds.
Set averaging times: 8 seconds and 16 seconds	Movement artifact - knocking	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 8 seconds, the second pulse oximeter is set to an averaging time of 16 seconds.
Set averaging times: 8 seconds and 16 seconds	Artifact - ambient light	SpO2 is measured by two pulse oximeters on one participant's hand (on the index finger and middle finger). One pulse oximeter is set to an averaging time of 8 seconds, the second pulse oximeter is set to an averaging time of 16 seconds.

Primary Outcome Measures

Name	Time	Method
SpO2 readings with different averaging times	30 minutes	Differences in the SpO2 signal during artifacts depending on the set averaging time.

Trial Locations

Locations (1)

Faculty of Biomedical Engineering, Czech Technical University in Prague; 🇨🇿 Kladno, Czechia