Torre-Bouscoulet Luis, Chávez-Plascencia Elizabeth, Vázquez-García Juan Carlos, Pérez-Padilla Rogelio
Clínica de Suefio, Instituto Nacional de Enfermedades Respiratorias, Tlalpan, DF México.
Rev Invest Clin. 2006 Jan-Feb;58(1):28-33.
Pulse oximeters are frequently used in the clinical practice and we must known their precision and accuracy. The objective was to evaluate the precision and accuracy of a "pocket" pulse oximeter at an altitude of 2,240 m above sea level.
We tested miniature pulse oximeters (Onyx 9,500, Nonin Finger Pulse Oximeter) in 96 patients sent to the pulmonary laboratory for an arterial blood sample. Patients were tested with 5 pulse oximeters placed in each of the fingers of the hand oposite to that used for the arterial puncture. The gold standard was the oxygen saturation of the arterial blood sample.
Blood samples had SaO2 of 87.2 +/- 11.0 (between 42.2 and 97.9%). Pulse oximeters had a mean error of 0.28 +/- 3.1%. SaO2 = (1.204 x SpO2) - 17.45966 (r = 0.92, p < 0.0001). Intraclass correlation coefficient between each of five pulse oximeters against the arterial blood standard ranged between 0.87 and 0.99. HbCO (2.4 +/- 0.6) did not affect the accuracy.
The miniature oximeter Nonin is precise and accurate at 2,240 m of altitude. The observed levels of HbCO did not affect the performance of the equipment. The oximeter good performance, small size and low cost enhances its clinical usefulness.
脉搏血氧仪在临床实践中经常使用，我们必须了解其精度和准确性。目的是评估一款“便携式”脉搏血氧仪在海拔2240米高度的精度和准确性。
我们对96名被送往肺功能实验室采集动脉血样本的患者进行了微型脉搏血氧仪（Onyx 9500、Nonin手指脉搏血氧仪）测试。患者使用5台脉搏血氧仪分别放置在与进行动脉穿刺的手相对的手的每个手指上进行测试。金标准是动脉血样本的氧饱和度。
血样的动脉血氧饱和度（SaO2）为87.2±11.0（42.2%至97.9%之间）。脉搏血氧仪的平均误差为0.28±3.1%。SaO2 =（1.204×脉搏血氧饱和度（SpO2）） - 17.45966（r = 0.92，p < 0.0001）。五台脉搏血氧仪中每一台与动脉血标准之间的组内相关系数在0.87至0.99之间。碳氧血红蛋白（HbCO）水平为（2.4±0.6），未影响准确性。
微型Nonin血氧仪在海拔2240米高度精确且准确。观察到的HbCO水平未影响设备性能。该血氧仪性能良好、体积小且成本低，增强了其临床实用性。
