Range of accuracy of two wavelength oximetry.
Range of accuracy of two wavelength oximetry.
复制标题
两种波长血氧测定法的准确度范围。
作者：
K. Chapman;F. L. Liu;R. M. Watson;A. Rebuck
双波长血氧仪的早期报告表明，在检查的最低值下，动脉血氧饱和度（SaO2）有高估的趋势。为了研究这种可能的不准确性，我们比较了血氧计读数与SaO2在实验室诱导的稳态缺氧比以前报道的范围更广。对于SaO2大于75%的值，血氧计读数与SaO2线性相关，y = 0.94 SaO2 + 8.7（r = 0.96），血氧计阅读与SaO2之间的平均差异为0.09%。然而，当SaO2低于75%时，仪器读数逐渐高于SaO2，因此当SaO2约为50%时，血氧计阅读约为65%。这些数据表明，当动脉饱和度福尔斯降至75%以下时，双波长血氧计显示错误升高的读数。
Earlier reports of a two wavelength oximeter suggested a tendency toward overestimation of arterial oxygen saturation (SaO2) at the lowest values examined. To investigate this possible inaccuracy, we compared oximeter readings to SaO2 over a wider range of laboratory-induced steady-state hypoxia than has previously been reported. For values of SaO2 greater than 75 percent, oximeter readings were linearly related to SaO2 such that y = 0.94 SaO2 + 8.7 (r = 0.96) and the mean difference between oximeter reading and SaO2 was 0.09 percent. However, when SaO2 was less than 75 percent, the instrument readings were progressively higher than the SaO2 so that when SaO2 was approximately 50 percent, the oximeter reading was approximately 65 percent. These data show that the two wavelength oximeter displays falsely elevated readings when the arterial saturation falls below 75 percent.