Collins Clare L, Andersen Chad C
Mercy Hospital For Women, Melbourne, Victoria, Australia.
J Paediatr Child Health. 2007 Jul-Aug;43(7-8):510-2. doi: 10.1111/j.1440-1754.2007.01075.x.
Pulse oximetry is often perceived to be a measure of the adequacy of oxygen delivery. It is, however, only a measure of oxygen bound to haemoglobin. Systemic oxygen delivery is principally determined by cardiac output, haemoglobin concentration and haemoglobin saturation. Changes to both cardiac output and haemoglobin concentration will significantly alter oxygen delivery without changing oxygen saturation. This article will describe the components of systemic oxygen delivery and the physiologic limitation of pulse oximetry and caution against over-interpretation of oximetry in the care of newborns.
脉搏血氧饱和度测定通常被视为衡量氧输送充足程度的指标。然而，它仅仅是对与血红蛋白结合的氧的一种测量。全身氧输送主要由心输出量、血红蛋白浓度和血红蛋白饱和度决定。心输出量和血红蛋白浓度的变化会显著改变氧输送，而不改变氧饱和度。本文将描述全身氧输送的组成部分以及脉搏血氧饱和度测定的生理局限性，并提醒在新生儿护理中不要过度解读血氧饱和度测定结果。
