SPO2 is the oxygen saturation, that is, your oxygenated protein ratio of soluble hemoglobin multiplied by 100%, the normal value is 94% to 98%. pr is the meaning of pulse rate, that is, the number of times your heart beats effectively per minute to produce a pulse, this value is basically the same as the heart rate, not the same, then it shows that there is atrial fibrillation or frequent preterm contractions. The same is true for the heart rate, which is the same as the heart rate.
The main measurements of oximetry are pulse rate, oxygen saturation, and perfusion index (PI). Oxygen saturation (oxygen saturation abbreviated as SpO2) is one of the most important basic data in clinical medicine. Oxygen saturation is defined as the percentage of bound O2 out of the total blood volume as compared to the total bound O2 volume.
Usually PI is used as a parametric indicator of the perfusion status of the limb of the person being tested, indicating the accuracy of the machine. That is, it can still be detected under low perfusion and weak perfusion conditions.
And, through the display of PI, it can also indicate the problem of the limb condition of the examinee itself, i.e., when there is low perfusion, it indicates whether the examinee has his/her own causes such as cardiac problems, shock, and so on.
It also shows whether there are external factors and other causes such as cold weather, poor peripheral circulation, etc., so that the above can be used to make a judgment!
PI is Perfusion Index (PI), PI value reflects the pulsatile blood flow, i.e., reflects the perfusion capacity. The greater the pulsatile blood flow, the greater the pulsatile component and the greater the PI value. Therefore, both the site of measurement (skin, nails, bone, etc. influence) and the patient's own perfusion (flow of arterial blood) will affect the PI value.
Because sympathetic nerves affect heart rate and arterial blood pressure (which affects pulsatile arterial blood flow), the body's neuromodulatory system or mental state also indirectly affects PI values. As a result, the PI values will be different for different states of anesthesia.