Abstract：
Pulse oximetry is widely used to non-invasively estimate the oxygen saturation of haemoglobin in arterial blood (SpO2). It is used widely throughout healthcare and was used extensively during the Covid-19 pandemic to detect and treat hypoxic patients. Research has suggested that pulse oximetry is less accurate in patients with darker skin. This led the US Food and Drug Administration agency (FDA) to issue a safety statement warning that pulse oximeters may be inaccurate when patients have pigmented skin. Evidence suggests that the oxygen saturation of arterial blood (SaO2) may be being overestimated by measuring SpO2 in those with pigmented skin. The degree of overestimation increases as SaO2 decreases especially when SpO2 reads below 80%. We review how pulse oximetry works and consider the implications for a patient\'s health when interpreting SpO2 in individuals with pigmented skin.
摘要：
脉搏血氧饱和度广泛用于无创估计动脉血中血红蛋白的氧饱和度（SpO2）。它在整个医疗保健中被广泛使用，并在新冠肺炎大流行期间被广泛用于检测和治疗缺氧患者。研究表明，在皮肤较黑的患者中，脉搏血氧饱和度的准确性较低。这导致美国食品和药物管理局（FDA）发布安全声明，警告当患者有色素性皮肤时，脉搏血氧计可能不准确。有证据表明，通过测量色素性皮肤患者的SpO2，可能高估了动脉血氧饱和度（SaO2）。高估的程度随着SaO2降低而增加,尤其是当SpO2读数低于80%时。我们回顾了脉搏血氧饱和度的工作原理，并考虑了在解释色素性皮肤个体的SpO2时对患者健康的影响。
