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Averaging time, desaturation level, duration and extent
  1. Jan Vagedes1,2,
  2. Christian F Poets1,
  3. Klaus Dietz3
  1. 1Department of Neonatology, Children's Hospital, University of Tübingen, Tübingen, Baden Württemberg, Germany
  2. 2ARCIM-Institute, Research Department, Filderklinik, Filderstadt, Baden Württemberg, Germany
  3. 3Department of Medical Biometry, University of Tübingen, Tübingen, Baden Württemberg, Germany
  1. Correspondence to  Professor Christian F Poets, Department of Neonatology, Children's Hospital, University of Tübingen, Calwerstr. 7, 72076 Tübingen, Germany; Christian-F.Poets{at}med.uni-tuebingen.de

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.

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