Blood oxygen probe definition
The blood oxygen probe, the full name of the SpO2 Sensor/SpO2 Probe, is to fix the probe finger on the patient's finger end, using the finger as a transparent container for hemoglobin, using red light with a wavelength of 660 nm and 940. The near-infrared light of nm is used as an incident light source, and the light transmission intensity through the tissue bed is measured to calculate the hemoglobin concentration and blood oxygen saturation. SpO2, pulse rate, and pulse wave can be obtained by SpO2 monitoring. It is applied to the blood oxygen monitoring of various patients, usually the other end is connected to the ECG monitor.
Blood oxygen saturation definition
Oxygen saturation refers to the maximum solubility of oxygen in the blood, and oxygen binding in the blood is mainly dependent on hemoglobin. Under normal circumstances, no change will occur, but if there is a high carbon monoxide content, it will change, resulting in carbon monoxide poisoning, that is, gas poisoning. Because carbon monoxide has a high affinity with hemoglobin, it will preferentially bind to carbon monoxide. As a result, the oxygen content in the blood is reduced. The blood oxygen saturation of normal human arterial blood is 98%, and venous blood is 75%. It is generally believed that SpO2 should be no less than 94% normal, and below 94% is insufficient oxygen supply. Some scholars have set SpO2 <90% as the standard for hypoxemia, and believe that when SpO2 is higher than 70%, the accuracy can reach ±2%, and when SpO2 is lower than 70%, there may be errors. Clinically, the SpO2 values of several patients were compared with the values of arterial oxygen saturation. It is considered that the SpO2 reading can reflect the patient's respiratory function and, to a certain extent, the change of pulse blood oxygen. In addition to the clinical symptoms and values of patients with thoracic surgery, blood flow analysis is required. Conventional application of pulse oximetry monitoring can provide meaningful indicators for clinical observation of disease changes, avoiding repeated blood collection by patients and reducing nurses' The workload is worth promoting.