Background: Body position alters aspects of pulmonary function in health and disease. Although studies have assessed positional effects on the heart and lungs, little is known about positional changes in gas exchange parameters at high altitude. We hypothesized that following ascent, supine positioning would cause lower oxygen saturation than sitting, partially due to decreased ventilation and increased partial pressure of end-tidal carbon dioxide (Petco₂).

中文翻译：

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高海拔地区动脉血氧饱和度和潮气中二氧化碳的位置变化：Medex 2015。

背景：身体姿势改变了健康和疾病中肺功能的各个方面。尽管研究已经评估了对心脏和肺的位置影响，但对于高海拔气体交换参数的位置变化知之甚少。我们假设，上升后仰卧位会比坐位引起更低的氧饱和度，部分原因是由于通气量减少和潮气末二氧化碳（P etco ₂）的分压增加。