Denver Veterans Affairs Medical Center, USA.
Respir Med. 2013 Jun;107(6):789-99. doi: 10.1016/j.rmed.2013.02.004. Epub 2013 Mar 13.
Pulse oximetry has revolutionized the ability to monitor oxygenation in a continuous, accurate, and non-invasive fashion. Despite its ubiquitous use, it is our impression and supported by studies that many providers do not know the basic principles behind its mechanism of function. This knowledge is important because it provides the conceptual basis of appreciating its limitations and recognizing when pulse oximeter readings may be erroneous. In this review, we discuss how pulse oximeters are able to distinguish oxygenated hemoglobin from deoxygenated hemoglobin and how they are able to recognize oxygen saturation only from the arterial compartment of blood. Based on these principles, we discuss the various conditions that can cause spurious readings and the mechanisms underlying them.
脉搏血氧仪的出现彻底改变了连续、准确、无创监测氧合的能力。尽管它的应用非常广泛，但我们的印象以及相关研究也表明，许多医务人员并不了解其工作机制背后的基本原理。这些知识非常重要，因为它为理解脉搏血氧仪的局限性以及认识到何时可能会出现错误读数提供了概念基础。在这篇综述中，我们将讨论脉搏血氧仪如何区分氧合血红蛋白和去氧血红蛋白，以及它们如何仅从血液的动脉部分识别氧饱和度。基于这些原理，我们将讨论可能导致错误读数的各种情况及其背后的机制。
