SpO2 Measurement Depending on Different Pulse Oximeter Averaging Time Settings

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

Detailed Description
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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.

Official Title
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SpO2 Measurement Depending on Different Pulse Oximeter Averaging Time Settings

Conditions
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Movement Artifacts During SpO2 Measurements, Reduced Perfusion During SpO2 Measurements

Intervention / Treatment
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* Other: Movement artifact - knocking
* Other: Movement artifact - tremor
* Other: Artifact - ambient light
* Other: Artifact - low perfusion
* Other: SpO2 measurement


Participation Criteria
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Eligibility Criteria
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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

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 30 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Crossover Assignment
Interventional Model Description: All participants go through all study arms, in random order. Two pulse oximeters with different averaging time settings are active simultaneously during measurement on each participant and the measured signal is compared.
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Set averaging times: 2-4 seconds and 8 seconds<br>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. | Other: Movement artifact - knocking<br>* 60 seconds motion artifact simulation - knocking with sensors<br>Other: Movement artifact - tremor<br>* 60 seconds motion artifact simulation - tremor with sensors<br>Other: Artifact - ambient light<br>* 60 seconds artifact simulation - ambient light using sensor opening<br>Other: Artifact - low perfusion<br>* 60 seconds artifact simulation - reduced perfusion using a cuff<br>Other: SpO2 measurement<br>* Two SpO2 measuring devices are active simultaneously on one hand during measurement.<br>|
| Experimental: Set averaging times: 8 seconds and 16 seconds<br>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. | Other: Movement artifact - knocking<br>* 60 seconds motion artifact simulation - knocking with sensors<br>Other: Movement artifact - tremor<br>* 60 seconds motion artifact simulation - tremor with sensors<br>Other: Artifact - ambient light<br>* 60 seconds artifact simulation - ambient light using sensor opening<br>Other: Artifact - low perfusion<br>* 60 seconds artifact simulation - reduced perfusion using a cuff<br>Other: SpO2 measurement<br>* Two SpO2 measuring devices are active simultaneously on one hand during measurement.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| SpO2 readings with different averaging times | Differences in the SpO2 signal during artifacts depending on the set averaging time. | 30 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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pulse oximetry, SpO2, averaging time, motion artifacts