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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.
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Set averaging times: 2-4 seconds and 8 seconds | Experimental | 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. |
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| Set averaging times: 8 seconds and 16 seconds | Experimental | 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. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Movement artifact - knocking | Other | 60 seconds motion artifact simulation - knocking with sensors |
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| 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 |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Veronika Rafl Huttova | Czech Technical University in Prague | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Faculty of Biomedical Engineering, Czech Technical University in Prague | Kladno | 27201 | Czechia |
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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.
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| Movement artifact - tremor | Other | 60 seconds motion artifact simulation - tremor with sensors |
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| Artifact - ambient light | Other | 60 seconds artifact simulation - ambient light using sensor opening |
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| Artifact - low perfusion | Other | 60 seconds artifact simulation - reduced perfusion using a cuff |
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| SpO2 measurement | Other | Two SpO2 measuring devices are active simultaneously on one hand during measurement. |
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