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Arch Dis Child Fetal Neonatal Ed. 2013 May;98(3):F265-6. doi: 10.1136/archdischild-2012-302543. Epub 2012 Sep 8.

Averaging time, desaturation level, duration and extent.

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  • 1Department of Neonatology, Children's Hospital, University of Tübingen, Calwerstr. 7, 72076 Tübingen, Germany.

Abstract

BACKGROUND:

Pulse oximeter saturation values are usually obtained by averaging over preceding measurements. This study investigates the dynamics between the averaging time and desaturation level, duration and extent.

METHODS AND RESULTS:

Prospective observational study of 15 preterm infants. Oxygen saturation was recorded for 168 h using a pulse oximeter. The raw red-to-infrared data were reprocessed using seven different averaging times to determine the number of desaturations below four thresholds and for seven different minimal desaturation durations. The total number of desaturations <80% was 339 with an averaging time of 16 s and 1958 with an averaging time of 3 s (minimal event duration >0 s). There was a significantly lower pulse oximeter saturation nadir with the shorter averaging time, while the maximum duration was significantly longer when using a 16 s averaging time.

CONCLUSIONS:

When using pulse oximeters, more attention should be given to averaging time and duration of desaturations.

PMID:
22960097
[PubMed - indexed for MEDLINE]
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