Giner J, Casan P
Unitat de Funció Pulmonar, Departament de Pneumologia, Hospital de la Santa Creu i de Sant Pau, Facultat de Medicina, Universitat Autònoma de Barcelona, Avda. Antoni M. Claret 167, 08025 Barcelona, Spain.
Arch Bronconeumol. 2004 Jul;40(7):311-4. doi: 10.1016/s1579-2129(06)60308-x.
To compare values reflecting oxyhemoglobin saturation obtained by pulse oximetry (SpO2) and values for end-tidal carbon dioxide pressure (PETCO2) obtained by capnography with direct measures of gas saturation values and pressures (PaO2 and PaCO2) in arterial blood gas samples.
We studied 57 consecutive patients ranging in age from 34 to 83 years--16 of whom were smokers--who presented for lung function testing.
The mean (SD) SpO2 was 95% (2.4%), and oxygen saturation measured directly in arterial blood samples was 95.1% (2.3%) (P=NS). The mean PETCO2 was 37.9 (5.3) mm Hg and PaCO2 by arterial blood gas analysis was 40.6 (5.4) mm Hg (P<.0001). The correlation between the 2 measurements of oxygen saturation (SpO2 and direct assessment) was 0.806 (P<.0001), and the correlation between PETCO2 and PaCO2 was 0.845 (P<.0001). The mean difference between the 2 expressions of oxygen saturation was 0.08% (1.46%) and between PETCO2 and PaCO2 was 2.7 (2.9) mm Hg.
Both measurement devices (pulse oximeter and capnograph) are appropriate for use in a lung function laboratory. The difference between PETCO2 and the PaCO2 should be kept in mind.
比较通过脉搏血氧饱和度仪测得的反映氧合血红蛋白饱和度的值（SpO2）以及通过二氧化碳描记法测得的呼气末二氧化碳分压值（PETCO2）与动脉血气样本中气体饱和度值和压力的直接测量值（PaO2和PaCO2）。
我们研究了57例年龄在34至83岁之间的连续患者，其中16例为吸烟者，这些患者前来进行肺功能测试。
SpO2的均值（标准差）为95%（2.4%），动脉血样本中直接测得的氧饱和度为95.1%（2.3%）（P=无显著差异）。PETCO2的均值为37.9（5.3）mmHg，动脉血气分析测得的PaCO2为40.6（5.4）mmHg（P<0.0001）。两种氧饱和度测量值（SpO2和直接评估）之间的相关性为0.806（P<0.0001），PETCO2与PaCO2之间的相关性为0.845（P<0.0001）。两种氧饱和度表达方式之间的平均差异为0.08%（1.46%），PETCO2与PaCO2之间的平均差异为2.7（2.9）mmHg。
两种测量设备（脉搏血氧饱和度仪和二氧化碳描记仪）均适用于肺功能实验室。应牢记PETCO2与PaCO2之间的差异。
