As the duration of recumbency prior to tilting and angle of the tilt are not standardized , they ary considerably 因为倾斜前的仰卧时间和倾斜角度的非标准化，试验结果变化较大。
2.
As the duration of recumbency prior to tilting and angle of the tilt are not standardized , they vary considerably 因为倾斜前的仰卧时间和倾斜角度的非标准化，试验结果变化较大。
3.
These findings suggest the hypothesis that fluid displacement to the upper body during recumbency may predispose to pharyngeal obstruction during sleep , especially in fluid oerload states , such as heart and renal failure 上述研究结果提示：平卧位休息时，液体转移至上体，可以引起睡眠过程中咽部梗阻，特别是在体液过多的状态下，比如心衰和肾功能衰竭。
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