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目的:探讨不同体位对严重肥胖者血氧饱和度的影响。方法:16名平均体重指数(BMI)为40±5肥胖者和16名年龄匹配的正常体重者被纳入研究。分别在不同体外下(坐位、仰卧位、侧卧位)对所有参与者进行动脉血气监测。结果:肥胖者于坐位时动脉Pa O_2为75±4 mm Hg,Pa CO_2为37±3 mm Hg;仰卧位时动脉Pa O_2为62±5 mm Hg,Pa CO_2为47±5 mm Hg;侧卧位时Pa O_2为73±3 mm Hg,Pa CO_2为39±2 mm Hg;而正常体重者无明显变化。结论:严重肥胖者于平卧位时更容易出现低氧及高碳酸血症。
Objective: To investigate the effect of different position on the oxygen saturation of severe obesity. METHODS: Sixteen individuals with a mean body mass index (BMI) of 40 ± 5 obesity and 16 age-matched normal-weight individuals were enrolled in the study. Arterial blood gas monitoring was performed on all participants under different in vitro conditions (sitting position, supine position and lateral position). Results: Pa O_2 was 75 ± 4 mm Hg and Pa CO_2 was 37 ± 3 mm Hg for obese people in sitting position; Pa ± 2 was 62 ± 5 mm Hg for supine position and 47 ± 5 mm Hg for Pa CO_2; Pa O_2 was 73 ± 3 mm Hg and Pa CO_2 was 39 ± 2 mm Hg for normal subjects, while no significant changes were observed for normal weight. Conclusion: Severe obesity is more prone to hypoxemia and hypercapnia in the supine position.