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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中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[5]。动脉血氧水平低于80%可能会损害器官功能,例如大脑和心脏,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,血液在肺中被氧化,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。
- ^ 存档副本. [2022-06-23]. (原始内容存档于2022-07-02).
- ^ 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).
- ^ 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
- ^ 存档副本. [2022-06-23]. (原始内容存档于2021-08-29).
- ^ 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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| 呼吸 | |
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| 控制 | |
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| 肺容量 | |
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| 循环 | |
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| 交互作用 |
- 通气 (V)
- 血流 (Q)
- 肺的各区域
- 气体交换
- 肺气压
- 肺泡气体方程
- 肺泡动脉血氧梯度
- 血红蛋白
- 氧–血红蛋白分离曲线
- 碳酸酐酶 (氯转移)
- 呼吸商数
- 动脉血液气体
- 弥散量
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| 不足 | |
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