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Commercial aircraft flight represents a highly variable altitude exposure that may result in significant hypoxemia even for the healthy subjects. We measured the arterial oxygen saturation by Nonin fi...nger pulse oximeters (%SpO2) in three healthy adults (two men and one woman) on regularly scheduled seven domestic commercial flights in Japan to study the correlation between cabin altitude and hypoxemia. For each flight, following data were recorded : date, airline, type of aircraft, flight altitude (either as announced over the aircraft public address system or obtained from the flight crew after arrival), departure airport, and arrival airport. Inflight cabin altitude and cabin pressure was continuously observed and peak values were manually recorded from a commercially available altimeter (Protrek, made by Casio Co. Ltd. ), and a handheld barometer made by Tsukasa Sokkenn Co. Ltd. The cabin pressure, which was maintained at between 805 and 911 hPa (mean ; 854.3 hPa), and the cabin altitude was between 1630 and 2380 m (mean : 1869 m) above the sea level. The mean %SpO2 on flights decreased to 92.0% from 97.1% before departure. The passengers even in the commercial aircraft flight must pay attension about air travel hypoxemia.show more
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