Oxygen saturation (SpO2) is the percentage of the capacity of oxygen-bound oxygenated hemoglobin (HbO2 _ 2) to the capacity of all bondable hemoglobin (Hb), that is, the oxygen concentration, which is an important physiological parameter of respiratory cycle.
Functional oxygen saturation is the ratio of HbO2 concentration to HbO2+Hb concentration, which is different from the percentage of oxygenated hemoglobin. Therefore, monitoring arterial oxygen saturation (SaO2 _ 2) can estimate oxygenation of lung and oxygen-carrying capacity of hemoglobin. The oxygen saturation of normal arterial blood is 98%, and that of venous blood is 75%.
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It is generally believed that the normal SaO2 should not be less than 94%, and less than 94% is insufficient oxygen supply. Some scholars believe that Sao 2
After thoracic surgery, patients need blood gas analysis, except that the clinical symptoms of individual cases are inconsistent with the numerical values. Routine application of pulse oxygen saturation monitoring can provide meaningful indicators for clinical observation of disease changes, avoid repeated blood collection by patients and reduce the workload of nurses, which is worth popularizing. Clinically, it is generally above 90%, of course, for different departments.
Baidu encyclopedia -SPO2