Averaging time, desaturation level, duration and extent

作者：Vagedes Jan; Poets Christian F^*; Dietz Klaus

来源：Archives of Disease in Childhood - Fetal and Neonatal Edition, 2013, 98(3): F265-F266.

DOI：10.1136/archdischild-2012-302543

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. %26lt;br%26gt;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 %26lt;80% was 339 with an averaging time of 165 and 1958 with an averaging time of 3 s (minimal event duration %26gt;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. %26lt;br%26gt;Conclusions When using pulse oximeters, more attention should be given to averaging time and duration of desaturations.

• 出版日期2013-5