研究目的
To determine the impact of averaging window-length on the “desaturation” indexes (DIs) obtained via overnight pulse oximetry (SpO2) at high altitude.
研究成果
Increasing the window length of an oximeter’s moving average leads to a progressive underestimation of the DIs obtained during sleep while sojourning at high altitude. Although moving averages may improve a pulse oximeter’s tolerance to unwanted noise, this robustness to artifact comes at the price of underestimating the frequency of desaturation/resaturation events and magnitude of nocturnal hypoxic exposure during sleep at high altitude.
研究不足
The study did not assess clinical outcomes, and the assertion that n = 1 is optimal must be considered as conjecture at this point. Further studies are required to substantiate this idea.
1：Experimental Design and Method Selection:
Overnight SpO2 data were collected during a 10-day sojourn at high altitude using a commercial wrist-worn finger oximeter modified to store unaveraged beat-to-beat data. Simple moving averages of window lengths spanning 2 to 20 cardiac beats were retrospectively applied to beat-to-beat SpO2 datasets.
2：Sample Selection and Data Sources:
Five healthy, adult males participated in the study.
3：List of Experimental Equipment and Materials:
Wrist-worn finger pulse oximeter (WristOx2, Model 3150, Nonin Medical Inc., Plymouth, MN, USA).
4：Experimental Procedures and Operational Workflow:
SpO2 data were collected overnight, artifacts were removed, and DIs were calculated for each averaged dataset.
5：Data Analysis Methods:
Repeated measures analyses of variance were used to examine the influence of averaging window-length on artifact index, SpO2 low, TST < 80, and ODI.
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