SpO2 Measurement Depending on Different Pulse Oximeter Averaging Time Settings

Czech Technical University in Prague

Status: Completed

Conditions: Reduced Perfusion During SpO2 Measurements; Movement Artifacts During SpO2 Measurements

Treatments: Other: Artifact - ambient light; Other: Movement artifact - knocking; Other: SpO2 measurement; Other: Movement artifact - tremor; Other: Artifact - low perfusion

Study type: Interventional

Funder types: Other

Identifiers

NCT04933773

POAveragingTime21

Details and patient eligibility

About

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

Full 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.

Enrollment: 17 patients

Sex: All

Ages: 18 to 30 years old

Volunteers: Accepts Healthy Volunteers

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

Trial design

Primary purpose: Other

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Single Blind

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17 participants in 2 patient groups

Set averaging times: 2-4 seconds and 8 seconds

Experimental group

Description:

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.

Treatment:

Other: Movement artifact - knocking

Other: SpO2 measurement

Other: Movement artifact - tremor

Other: Artifact - low perfusion

Other: Artifact - ambient light

Set averaging times: 8 seconds and 16 seconds

Experimental group

Description:

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.

Treatment:

Other: Movement artifact - knocking

Other: SpO2 measurement

Other: Movement artifact - tremor

Other: Artifact - low perfusion

Other: Artifact - ambient light