Brown Zoe, Edworthy Judy, Sneyd J Robert, Schlesinger Joseph
Department of Pediatric Anesthesia, BC Children's Hospital, Vancouver, BC, Canada; Department of Anesthesiology, Pharmacology and Therapeutics, University of British Columbia, Vancouver, BC, Canada.
Cognition Institute, University of Plymouth, Drake Circus, Plymouth, Devon PL4 8AA, UK.
Appl Ergon. 2015 Nov;51:350-7. doi: 10.1016/j.apergo.2015.06.006. Epub 2015 Jun 23.
This study compared the ability of forty anaesthetists to judge absolute levels of oxygen saturation, direction of change, and size of change in saturation using auditory pitch and pitch difference in two laboratory-based studies that compared a linear pitch scale with a logarithmic scale. In the former the differences in saturation become perceptually closer as the oxygenation level becomes higher whereas in the latter the pitch differences are perceptually equivalent across the whole range of values. The results show that anaesthetist participants produce significantly more accurate judgements of both absolute oxygenation values and size of oxygenation level difference when a logarithmic, rather than a linear, scale is used. The line of best fit for the logarithmic function was also closer to x = y than for the linear function. The results of these studies can inform the development and standardisation of pulse oximetry tones in order to improve patient safety.
在两项基于实验室的研究中，这40位麻醉师利用听觉音高和音高差异，比较了判断氧饱和度绝对水平、变化方向以及饱和度变化大小的能力，这两项研究比较了线性音高量表和对数量表。在前者中，随着氧合水平升高，饱和度差异在感知上变得更近，而在后者中，在整个数值范围内，音高差异在感知上是等效的。结果表明，当使用对数量表而非线性量表时，参与研究的麻醉师对绝对氧合值和氧合水平差异大小的判断明显更准确。对数函数的最佳拟合线也比线性函数更接近x = y。这些研究结果可为脉搏血氧饱和度音调的开发和标准化提供参考，以提高患者安全性。
