平均时间、饱和度水平、持续时间和程度。
Averaging time, desaturation level, duration and extent.
机构信息
Department of Neonatology, Children's Hospital, University of Tübingen, Calwerstr. 7, 72076 Tübingen, Germany.
出版信息
Arch Dis Child Fetal Neonatal Ed. 2013 May;98(3):F265-6. doi: 10.1136/archdischild-2012-302543. Epub 2012 Sep 8.
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.
背景
脉搏血氧饱和度值通常通过对之前的测量值进行平均来获得。本研究调查了平均时间与饱和度下降水平、持续时间和程度之间的动态关系。
方法和结果
对 15 名早产儿进行前瞻性观察研究。使用脉搏血氧计记录 168 小时的氧饱和度。使用七种不同的平均时间对原始的红光到红外线数据进行重新处理，以确定低于四个阈值的饱和度下降次数和七个不同的最小饱和度持续时间。平均时间为 16 秒时，<80%的饱和度下降总数为 339 次，平均时间为 3 秒时为 1958 次（最小事件持续时间>0 秒）。较短的平均时间会导致脉搏血氧仪饱和度的最低点明显降低，而使用 16 秒的平均时间时，最大持续时间明显更长。
结论
在使用脉搏血氧仪时，应更加注意平均时间和饱和度下降的持续时间。
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