不同体位对严重肥胖者血氧饱和度的影响

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。

Effect of Different Position on the Oxygen Saturation of Patientswith Severe Obesity

Objective:To investigate the effect of different positions on the oxygen saturation in subjects with severe obesity.Methods:Eight obese subjects (OS) with a mean body mass index (BMI) of 40± 5 kg/m2 and Eight age-matched normal-weight controlsubjects (CS) were enrolled in the study. Under different positions (sitting, supine and lateral positions ), all participants arterial blood gaswere be monitored.Results:Obese subjects when supine had a significantly less value of PaO2 and a more severe hypercapnia. In sittingpostures , PaO2was 75 ± 4 mmHg, PaCO2 was 37 ± 3 mmHg; In supine postures, PaO2was 62 ± 5 mmHg, PaCO2 was 47 ± 5 mmHg;In lateral postures, PaO2 was 73 ± 3 mmHg, PaCO2 was 39 ± 2 mmHg; while no significant changes in the normal weight.Conclusion:Patients with severe obesity were more prone to have hypoxia and hypercapnia in the supine position.