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血氧饱和度

血氧饱和度blood oxygen saturation level)或称血氧浓度,简称氧饱和[1](oxygen saturation,SO2),是血液中氧含量与氧容量的比值,亦即血中“氧饱和血红蛋白”相对于“总血红蛋白(不饱和+饱和)”的比值[2]。而氧分子与血红蛋白肌红蛋白分子等的物理结合,不发生化学变化的过程或状态,称为氧合(oxygenation)。临床上,常用“氧合”来指代医用血氧饱和度。

人体需要并调节血液氧气的非常精确和特定的平衡。人体的正常动脉血氧饱和度(SaO2)为97-100%[3],或96-99%[4]。如果该水平低于90%,则被认为是低氧血症英语Hypoxemia[5]。动脉血氧水平低于80%可能会损害器官功能,例如大脑心脏,应及时解决。持续的低氧水平可能导致呼吸或心脏骤停氧气疗法可用于协助提高血氧水平。当氧分子进入人体组织。例如,血液在中被氧化,其中的氧分子从空气中进入血液。

临床上,监测血氧饱和度的简易方法,是使用脉氧仪

参见

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参考资料

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  1. ^ 存档副本. [2022-06-23]. (原始内容存档于2022-07-02). 
  2. ^ Kenneth D. McClatchey. Clinical Laboratory Medicine. Philadelphia: Lippincott Williams & Wilkins. 2002: 370 [2020-02-12]. (原始内容存档于2018-09-03). 
  3. ^ Kobayashi, Masaru MD*; Fukuda, Shinya MD; Takano, Ken-ichi MD, PhD; Kamizono, Junji MD; Ichikawa, Kotaro MD Can a pulse oxygen saturation of 95% to 96% help predict further vital sign destabilization in school-aged children?, Medicine: June 2018 - Volume 97 - Issue 25 - p e11135. doi: 10.1097/MD.0000000000011135
  4. ^ 存档副本. [2022-06-23]. (原始内容存档于2021-08-29). 
  5. ^ Hypoxemia (low blood oxygen). Mayo Clinic. mayoclinic.com. [6 June 2013]. (原始内容存档于2012-10-06). 
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血氧饱和度
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